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Understanding Routing Table with OpenVPN
Why is my router not routing?Windows 7 network connectionsHow Can I enable rdp access to a laptop after it connects to VPN?OpenVPN stopped working, what could have happened?How to setup Internet gateway Windows Server 2008 by Routing and Remote AccessOpenVPN routing table changeRouting all traffic over VPN on Ubuntu LinuxInvalid IP Configuration errorWhy does my hostname resolve to IP of virtual nic and not the physical one?default gateway after network card damage
Network layout: Laptop (OpenVPN client) <-> router with 192.168.1.xxx subnet <-> internet <-> Home router (running DD-WRT with OpenVPN server) with 192.168.11.xxx subnet
The VPN server is operating in layer 2 mode (bridge). All of my internet traffic passes through the VPN tunnel. My home router & VPN have an external IP of 68.64.127.82.
My laptop (VPN client) has an IP address on the physical LAN of 192.168.1.40. My IP address on the VPN is 192.168.11.50.
Here is my question: What makes all the internet traffic pass through the VPN tunnel?
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
The first line says everything should go the router I'm physically connected to (not the VPN router). The second line makes no sense to me. The 192.168.11.xxx subnet is on my VPN. How can you have a 0.0.0.0 destination with a netmask?!?
Question 2: What does the 128.0.0.0 netmask mean with a 0.0.0.0 destination?
Question 3: Why does the second line take priority over the first line?
Thanks for your help!
Here is my full routing table:
Here is my full routing table:
C:Usersowner>route print
===========================================================================
Interface List
19...00 ff 79 ee e1 6b ......TAP-Windows Adapter V9
10...00 1a 4b 13 d2 92 ......Broadcom NetLink (TM) Gigabit Ethernet
1...........................Software Loopback Interface 1
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
68.64.127.82 255.255.255.255 192.168.1.1 192.168.1.40 20
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
128.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
192.168.1.0 255.255.255.0 On-link 192.168.1.40 276
192.168.1.40 255.255.255.255 On-link 192.168.1.40 276
192.168.1.255 255.255.255.255 On-link 192.168.1.40 276
192.168.11.0 255.255.255.0 On-link 192.168.11.50 286
192.168.11.50 255.255.255.255 On-link 192.168.11.50 286
192.168.11.255 255.255.255.255 On-link 192.168.11.50 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.40 276
224.0.0.0 240.0.0.0 On-link 192.168.11.50 286
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.40 276
255.255.255.255 255.255.255.255 On-link 192.168.11.50 286
===========================================================================
Here is my ipconfig:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-79-EE-E1-6B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c1f8:5d3:e14:dba6%19(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.11.50(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:53 AM
Lease Expires . . . . . . . . . . : Friday, December 11, 2015 11:20:53 AM
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . : 192.168.11.0
DHCPv6 IAID . . . . . . . . . . . : 520159097
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-6B-D2-7C
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-1A-4B-13-D2-92
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::61c0:c604:f3e5:498%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.40(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:35 AM
Lease Expires . . . . . . . . . . : Friday, December 12, 2014 11:20:35 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234887755
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-13-D2-92
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
networking router vpn openvpn
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
add a comment |
Network layout: Laptop (OpenVPN client) <-> router with 192.168.1.xxx subnet <-> internet <-> Home router (running DD-WRT with OpenVPN server) with 192.168.11.xxx subnet
The VPN server is operating in layer 2 mode (bridge). All of my internet traffic passes through the VPN tunnel. My home router & VPN have an external IP of 68.64.127.82.
My laptop (VPN client) has an IP address on the physical LAN of 192.168.1.40. My IP address on the VPN is 192.168.11.50.
Here is my question: What makes all the internet traffic pass through the VPN tunnel?
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
The first line says everything should go the router I'm physically connected to (not the VPN router). The second line makes no sense to me. The 192.168.11.xxx subnet is on my VPN. How can you have a 0.0.0.0 destination with a netmask?!?
Question 2: What does the 128.0.0.0 netmask mean with a 0.0.0.0 destination?
Question 3: Why does the second line take priority over the first line?
Thanks for your help!
Here is my full routing table:
Here is my full routing table:
C:Usersowner>route print
===========================================================================
Interface List
19...00 ff 79 ee e1 6b ......TAP-Windows Adapter V9
10...00 1a 4b 13 d2 92 ......Broadcom NetLink (TM) Gigabit Ethernet
1...........................Software Loopback Interface 1
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
68.64.127.82 255.255.255.255 192.168.1.1 192.168.1.40 20
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
128.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
192.168.1.0 255.255.255.0 On-link 192.168.1.40 276
192.168.1.40 255.255.255.255 On-link 192.168.1.40 276
192.168.1.255 255.255.255.255 On-link 192.168.1.40 276
192.168.11.0 255.255.255.0 On-link 192.168.11.50 286
192.168.11.50 255.255.255.255 On-link 192.168.11.50 286
192.168.11.255 255.255.255.255 On-link 192.168.11.50 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.40 276
224.0.0.0 240.0.0.0 On-link 192.168.11.50 286
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.40 276
255.255.255.255 255.255.255.255 On-link 192.168.11.50 286
===========================================================================
Here is my ipconfig:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-79-EE-E1-6B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c1f8:5d3:e14:dba6%19(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.11.50(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:53 AM
Lease Expires . . . . . . . . . . : Friday, December 11, 2015 11:20:53 AM
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . : 192.168.11.0
DHCPv6 IAID . . . . . . . . . . . : 520159097
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-6B-D2-7C
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-1A-4B-13-D2-92
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::61c0:c604:f3e5:498%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.40(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:35 AM
Lease Expires . . . . . . . . . . : Friday, December 12, 2014 11:20:35 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234887755
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-13-D2-92
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
networking router vpn openvpn
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
add a comment |
Network layout: Laptop (OpenVPN client) <-> router with 192.168.1.xxx subnet <-> internet <-> Home router (running DD-WRT with OpenVPN server) with 192.168.11.xxx subnet
The VPN server is operating in layer 2 mode (bridge). All of my internet traffic passes through the VPN tunnel. My home router & VPN have an external IP of 68.64.127.82.
My laptop (VPN client) has an IP address on the physical LAN of 192.168.1.40. My IP address on the VPN is 192.168.11.50.
Here is my question: What makes all the internet traffic pass through the VPN tunnel?
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
The first line says everything should go the router I'm physically connected to (not the VPN router). The second line makes no sense to me. The 192.168.11.xxx subnet is on my VPN. How can you have a 0.0.0.0 destination with a netmask?!?
Question 2: What does the 128.0.0.0 netmask mean with a 0.0.0.0 destination?
Question 3: Why does the second line take priority over the first line?
Thanks for your help!
Here is my full routing table:
Here is my full routing table:
C:Usersowner>route print
===========================================================================
Interface List
19...00 ff 79 ee e1 6b ......TAP-Windows Adapter V9
10...00 1a 4b 13 d2 92 ......Broadcom NetLink (TM) Gigabit Ethernet
1...........................Software Loopback Interface 1
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
68.64.127.82 255.255.255.255 192.168.1.1 192.168.1.40 20
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
128.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
192.168.1.0 255.255.255.0 On-link 192.168.1.40 276
192.168.1.40 255.255.255.255 On-link 192.168.1.40 276
192.168.1.255 255.255.255.255 On-link 192.168.1.40 276
192.168.11.0 255.255.255.0 On-link 192.168.11.50 286
192.168.11.50 255.255.255.255 On-link 192.168.11.50 286
192.168.11.255 255.255.255.255 On-link 192.168.11.50 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.40 276
224.0.0.0 240.0.0.0 On-link 192.168.11.50 286
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.40 276
255.255.255.255 255.255.255.255 On-link 192.168.11.50 286
===========================================================================
Here is my ipconfig:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-79-EE-E1-6B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c1f8:5d3:e14:dba6%19(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.11.50(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:53 AM
Lease Expires . . . . . . . . . . : Friday, December 11, 2015 11:20:53 AM
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . : 192.168.11.0
DHCPv6 IAID . . . . . . . . . . . : 520159097
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-6B-D2-7C
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-1A-4B-13-D2-92
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::61c0:c604:f3e5:498%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.40(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:35 AM
Lease Expires . . . . . . . . . . : Friday, December 12, 2014 11:20:35 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234887755
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-13-D2-92
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
networking router vpn openvpn
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
Network layout: Laptop (OpenVPN client) <-> router with 192.168.1.xxx subnet <-> internet <-> Home router (running DD-WRT with OpenVPN server) with 192.168.11.xxx subnet
The VPN server is operating in layer 2 mode (bridge). All of my internet traffic passes through the VPN tunnel. My home router & VPN have an external IP of 68.64.127.82.
My laptop (VPN client) has an IP address on the physical LAN of 192.168.1.40. My IP address on the VPN is 192.168.11.50.
Here is my question: What makes all the internet traffic pass through the VPN tunnel?
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
The first line says everything should go the router I'm physically connected to (not the VPN router). The second line makes no sense to me. The 192.168.11.xxx subnet is on my VPN. How can you have a 0.0.0.0 destination with a netmask?!?
Question 2: What does the 128.0.0.0 netmask mean with a 0.0.0.0 destination?
Question 3: Why does the second line take priority over the first line?
Thanks for your help!
Here is my full routing table:
Here is my full routing table:
C:Usersowner>route print
===========================================================================
Interface List
19...00 ff 79 ee e1 6b ......TAP-Windows Adapter V9
10...00 1a 4b 13 d2 92 ......Broadcom NetLink (TM) Gigabit Ethernet
1...........................Software Loopback Interface 1
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.40 20
0.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
68.64.127.82 255.255.255.255 192.168.1.1 192.168.1.40 20
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
128.0.0.0 128.0.0.0 192.168.11.1 192.168.11.50 30
192.168.1.0 255.255.255.0 On-link 192.168.1.40 276
192.168.1.40 255.255.255.255 On-link 192.168.1.40 276
192.168.1.255 255.255.255.255 On-link 192.168.1.40 276
192.168.11.0 255.255.255.0 On-link 192.168.11.50 286
192.168.11.50 255.255.255.255 On-link 192.168.11.50 286
192.168.11.255 255.255.255.255 On-link 192.168.11.50 286
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 192.168.1.40 276
224.0.0.0 240.0.0.0 On-link 192.168.11.50 286
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 192.168.1.40 276
255.255.255.255 255.255.255.255 On-link 192.168.11.50 286
===========================================================================
Here is my ipconfig:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-79-EE-E1-6B
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c1f8:5d3:e14:dba6%19(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.11.50(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:53 AM
Lease Expires . . . . . . . . . . : Friday, December 11, 2015 11:20:53 AM
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . : 192.168.11.0
DHCPv6 IAID . . . . . . . . . . . : 520159097
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-6B-D2-7C
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-1A-4B-13-D2-92
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::61c0:c604:f3e5:498%10(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.40(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, December 11, 2014 11:20:35 AM
Lease Expires . . . . . . . . . . : Friday, December 12, 2014 11:20:35 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 234887755
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-A1-5A-F6-00-1A-4B-13-D2-92
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
networking router vpn openvpn
networking router vpn openvpn
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
edited Dec 5 '15 at 14:19
That Brazilian Guy
4,80375391
4,80375391
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
asked Dec 11 '14 at 17:50
pkSMLpkSML
1521313
1521313
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Solved! Thanks to eibgrad at the DD-WRT forums. Here is his answer:
(Source: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=277001 )
It's just a clever hack/trick.
There’s actually TWO important extra routes the VPN adds:
128.0.0.0/128.0.0.0 (covers 0.0.0.0 thru 127.255.255.255)
0.0.0.0/128.0.0.0 (covers 128.0.0.0 thru 255.255.255.255)
The reason this works is because when it comes to routing, a more specific route is always preferred over a more general route. And 0.0.0.0/0.0.0.0 (the default gateway) is as general as it gets. But if we insert the above two routes, the fact they are more specific means one of them will always be chosen before 0.0.0.0/0.0.0.0 since those two routes still cover the entire IP spectrum (0.0.0.0 thru 255.255.255.255).
VPNs do this to avoid messing w/ existing routes. They don’t need to delete anything that was already there, or even examine the routing table. They just add their own routes when the VPN comes up, and remove them when the VPN is shutdown. Simple.
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
3
Aren't IP address ranges swapped here?0.0.0.0/128.0.0.0covers0.0.0.0 - 127.255.255.255and128.0.0.0/128.0.0.0covers128.0.0.0 - 255.255.255.255
– Bojan Komazec
Feb 19 '16 at 16:07
add a comment |
@Bojan Komazec is right
the 0.0.0.0/1 binary format is like blew:
ip : 00000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
01111111.00000000.00000000.00000000
01111110.00000000.00000000.00000000
01111101.00000000.00000000.00000000
....
So 0.0.0.0/1 covers 0.0.0.0 - 127.255.255.255
the 128.0.0.0/1 binary format is like blew:
ip : 10000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
11111111.00000000.00000000.00000000
11111110.00000000.00000000.00000000
11111101.00000000.00000000.00000000
So 127.0.0.0/1 covers 128.0.0.1 - 255.255.255.255
answered 2 mins ago
jamleejamlee
1011
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Solved! Thanks to eibgrad at the DD-WRT forums. Here is his answer:
(Source: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=277001 )
It's just a clever hack/trick.
There’s actually TWO important extra routes the VPN adds:
128.0.0.0/128.0.0.0 (covers 0.0.0.0 thru 127.255.255.255)
0.0.0.0/128.0.0.0 (covers 128.0.0.0 thru 255.255.255.255)
The reason this works is because when it comes to routing, a more specific route is always preferred over a more general route. And 0.0.0.0/0.0.0.0 (the default gateway) is as general as it gets. But if we insert the above two routes, the fact they are more specific means one of them will always be chosen before 0.0.0.0/0.0.0.0 since those two routes still cover the entire IP spectrum (0.0.0.0 thru 255.255.255.255).
VPNs do this to avoid messing w/ existing routes. They don’t need to delete anything that was already there, or even examine the routing table. They just add their own routes when the VPN comes up, and remove them when the VPN is shutdown. Simple.
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
3
Aren't IP address ranges swapped here?0.0.0.0/128.0.0.0covers0.0.0.0 - 127.255.255.255and128.0.0.0/128.0.0.0covers128.0.0.0 - 255.255.255.255
– Bojan Komazec
Feb 19 '16 at 16:07
add a comment |
Solved! Thanks to eibgrad at the DD-WRT forums. Here is his answer:
(Source: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=277001 )
It's just a clever hack/trick.
There’s actually TWO important extra routes the VPN adds:
128.0.0.0/128.0.0.0 (covers 0.0.0.0 thru 127.255.255.255)
0.0.0.0/128.0.0.0 (covers 128.0.0.0 thru 255.255.255.255)
The reason this works is because when it comes to routing, a more specific route is always preferred over a more general route. And 0.0.0.0/0.0.0.0 (the default gateway) is as general as it gets. But if we insert the above two routes, the fact they are more specific means one of them will always be chosen before 0.0.0.0/0.0.0.0 since those two routes still cover the entire IP spectrum (0.0.0.0 thru 255.255.255.255).
VPNs do this to avoid messing w/ existing routes. They don’t need to delete anything that was already there, or even examine the routing table. They just add their own routes when the VPN comes up, and remove them when the VPN is shutdown. Simple.
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
3
Aren't IP address ranges swapped here?0.0.0.0/128.0.0.0covers0.0.0.0 - 127.255.255.255and128.0.0.0/128.0.0.0covers128.0.0.0 - 255.255.255.255
– Bojan Komazec
Feb 19 '16 at 16:07
add a comment |
Solved! Thanks to eibgrad at the DD-WRT forums. Here is his answer:
(Source: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=277001 )
It's just a clever hack/trick.
There’s actually TWO important extra routes the VPN adds:
128.0.0.0/128.0.0.0 (covers 0.0.0.0 thru 127.255.255.255)
0.0.0.0/128.0.0.0 (covers 128.0.0.0 thru 255.255.255.255)
The reason this works is because when it comes to routing, a more specific route is always preferred over a more general route. And 0.0.0.0/0.0.0.0 (the default gateway) is as general as it gets. But if we insert the above two routes, the fact they are more specific means one of them will always be chosen before 0.0.0.0/0.0.0.0 since those two routes still cover the entire IP spectrum (0.0.0.0 thru 255.255.255.255).
VPNs do this to avoid messing w/ existing routes. They don’t need to delete anything that was already there, or even examine the routing table. They just add their own routes when the VPN comes up, and remove them when the VPN is shutdown. Simple.
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
Solved! Thanks to eibgrad at the DD-WRT forums. Here is his answer:
(Source: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=277001 )
It's just a clever hack/trick.
There’s actually TWO important extra routes the VPN adds:
128.0.0.0/128.0.0.0 (covers 0.0.0.0 thru 127.255.255.255)
0.0.0.0/128.0.0.0 (covers 128.0.0.0 thru 255.255.255.255)
The reason this works is because when it comes to routing, a more specific route is always preferred over a more general route. And 0.0.0.0/0.0.0.0 (the default gateway) is as general as it gets. But if we insert the above two routes, the fact they are more specific means one of them will always be chosen before 0.0.0.0/0.0.0.0 since those two routes still cover the entire IP spectrum (0.0.0.0 thru 255.255.255.255).
VPNs do this to avoid messing w/ existing routes. They don’t need to delete anything that was already there, or even examine the routing table. They just add their own routes when the VPN comes up, and remove them when the VPN is shutdown. Simple.
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
answered Dec 11 '14 at 21:10
pkSMLpkSML
1521313
1521313
3
Aren't IP address ranges swapped here?0.0.0.0/128.0.0.0covers0.0.0.0 - 127.255.255.255and128.0.0.0/128.0.0.0covers128.0.0.0 - 255.255.255.255
– Bojan Komazec
Feb 19 '16 at 16:07
add a comment |
3
Aren't IP address ranges swapped here?0.0.0.0/128.0.0.0covers0.0.0.0 - 127.255.255.255and128.0.0.0/128.0.0.0covers128.0.0.0 - 255.255.255.255
– Bojan Komazec
Feb 19 '16 at 16:07
3
3
Aren't IP address ranges swapped here?
0.0.0.0/128.0.0.0 covers 0.0.0.0 - 127.255.255.255 and 128.0.0.0/128.0.0.0 covers 128.0.0.0 - 255.255.255.255– Bojan Komazec
Feb 19 '16 at 16:07
Aren't IP address ranges swapped here?
0.0.0.0/128.0.0.0 covers 0.0.0.0 - 127.255.255.255 and 128.0.0.0/128.0.0.0 covers 128.0.0.0 - 255.255.255.255– Bojan Komazec
Feb 19 '16 at 16:07
add a comment |
@Bojan Komazec is right
the 0.0.0.0/1 binary format is like blew:
ip : 00000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
01111111.00000000.00000000.00000000
01111110.00000000.00000000.00000000
01111101.00000000.00000000.00000000
....
So 0.0.0.0/1 covers 0.0.0.0 - 127.255.255.255
the 128.0.0.0/1 binary format is like blew:
ip : 10000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
11111111.00000000.00000000.00000000
11111110.00000000.00000000.00000000
11111101.00000000.00000000.00000000
So 127.0.0.0/1 covers 128.0.0.1 - 255.255.255.255
answered 2 mins ago
jamleejamlee
1011
add a comment |
@Bojan Komazec is right
the 0.0.0.0/1 binary format is like blew:
ip : 00000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
01111111.00000000.00000000.00000000
01111110.00000000.00000000.00000000
01111101.00000000.00000000.00000000
....
So 0.0.0.0/1 covers 0.0.0.0 - 127.255.255.255
the 128.0.0.0/1 binary format is like blew:
ip : 10000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
11111111.00000000.00000000.00000000
11111110.00000000.00000000.00000000
11111101.00000000.00000000.00000000
So 127.0.0.0/1 covers 128.0.0.1 - 255.255.255.255
answered 2 mins ago
jamleejamlee
1011
add a comment |
@Bojan Komazec is right
the 0.0.0.0/1 binary format is like blew:
ip : 00000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
01111111.00000000.00000000.00000000
01111110.00000000.00000000.00000000
01111101.00000000.00000000.00000000
....
So 0.0.0.0/1 covers 0.0.0.0 - 127.255.255.255
the 128.0.0.0/1 binary format is like blew:
ip : 10000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
11111111.00000000.00000000.00000000
11111110.00000000.00000000.00000000
11111101.00000000.00000000.00000000
So 127.0.0.0/1 covers 128.0.0.1 - 255.255.255.255
answered 2 mins ago
jamleejamlee
1011
@Bojan Komazec is right
the 0.0.0.0/1 binary format is like blew:
ip : 00000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
01111111.00000000.00000000.00000000
01111110.00000000.00000000.00000000
01111101.00000000.00000000.00000000
....
So 0.0.0.0/1 covers 0.0.0.0 - 127.255.255.255
the 128.0.0.0/1 binary format is like blew:
ip : 10000000.00000000.00000000.00000000
mask : 10000000.00000000.00000000.00000000
result the subet like this:
11111111.00000000.00000000.00000000
11111110.00000000.00000000.00000000
11111101.00000000.00000000.00000000
So 127.0.0.0/1 covers 128.0.0.1 - 255.255.255.255
answered 2 mins ago
jamleejamlee
1011
answered 2 mins ago
jamleejamlee
1011
answered 2 mins ago
jamleejamlee
1011
answered 2 mins ago
jamleejamlee
1011
1011
add a comment |
add a comment |
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