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Making a two-way bridge between two interfaces
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I want to bridge a connection, I made a quick drawing of my setup: (eth0 isn't connected to anything). All of the computers are running CentOS 7.
I wish to allow PC A to ping and send packets to PC B, and vice versa. Both of the PCs should also be able to ping / send packets to the server, however they should not be able to access the internet. I have tried solutions with iptables such as This answer, but that only allowed PC A to ping the server, no interconnection.
Do you have any idea how I could set this up?
linux networking wireless-networking iptables
edited 7 mins ago
karel
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
add a comment |
I want to bridge a connection, I made a quick drawing of my setup: (eth0 isn't connected to anything). All of the computers are running CentOS 7.
I wish to allow PC A to ping and send packets to PC B, and vice versa. Both of the PCs should also be able to ping / send packets to the server, however they should not be able to access the internet. I have tried solutions with iptables such as This answer, but that only allowed PC A to ping the server, no interconnection.
Do you have any idea how I could set this up?
linux networking wireless-networking iptables
edited 7 mins ago
karel
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
add a comment |
I want to bridge a connection, I made a quick drawing of my setup: (eth0 isn't connected to anything). All of the computers are running CentOS 7.
I wish to allow PC A to ping and send packets to PC B, and vice versa. Both of the PCs should also be able to ping / send packets to the server, however they should not be able to access the internet. I have tried solutions with iptables such as This answer, but that only allowed PC A to ping the server, no interconnection.
Do you have any idea how I could set this up?
linux networking wireless-networking iptables
edited 7 mins ago
karel
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
I want to bridge a connection, I made a quick drawing of my setup: (eth0 isn't connected to anything). All of the computers are running CentOS 7.
I wish to allow PC A to ping and send packets to PC B, and vice versa. Both of the PCs should also be able to ping / send packets to the server, however they should not be able to access the internet. I have tried solutions with iptables such as This answer, but that only allowed PC A to ping the server, no interconnection.
Do you have any idea how I could set this up?
linux networking wireless-networking iptables
linux networking wireless-networking iptables
edited 7 mins ago
karel
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
edited 7 mins ago
karel
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
edited 7 mins ago
karel
9,27293139
edited 7 mins ago
karel
9,27293139
edited 7 mins ago
karel
9,27293139
9,27293139
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
asked Jul 15 '15 at 19:17
Alex ShmakovAlex Shmakov
31
31
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
That is easy: do not specify default gateway/default route on PC's A and B. This should keep both A and B from reaching the Internet and each other. To allow A and B to communicate with each other, add static routes on each PC to reach the other's network. Add a static route on PC A to PC B's network, and add a static route on PC B to PC A's network.
Assume that PC A's network is 10.0.0.0/30 and PC B's network is 10.0.0.4/30. On PC A, run (as root) route add -net 10.0.0.4/30 gw [ip_of_eth2] and on PC B, run (also as root) route add -net 10.0.0.0/30 gw [ip_of_eth3]. Also, make sure that IP forwarding is enabled on the server (i.e. /proc/sys/net/ipv4/ip_forward should be 1).
This is of course routing, not bridging, but it is more suitable based on your topology and need.
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
add a comment |
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That is easy: do not specify default gateway/default route on PC's A and B. This should keep both A and B from reaching the Internet and each other. To allow A and B to communicate with each other, add static routes on each PC to reach the other's network. Add a static route on PC A to PC B's network, and add a static route on PC B to PC A's network.
Assume that PC A's network is 10.0.0.0/30 and PC B's network is 10.0.0.4/30. On PC A, run (as root) route add -net 10.0.0.4/30 gw [ip_of_eth2] and on PC B, run (also as root) route add -net 10.0.0.0/30 gw [ip_of_eth3]. Also, make sure that IP forwarding is enabled on the server (i.e. /proc/sys/net/ipv4/ip_forward should be 1).
This is of course routing, not bridging, but it is more suitable based on your topology and need.
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
add a comment |
That is easy: do not specify default gateway/default route on PC's A and B. This should keep both A and B from reaching the Internet and each other. To allow A and B to communicate with each other, add static routes on each PC to reach the other's network. Add a static route on PC A to PC B's network, and add a static route on PC B to PC A's network.
Assume that PC A's network is 10.0.0.0/30 and PC B's network is 10.0.0.4/30. On PC A, run (as root) route add -net 10.0.0.4/30 gw [ip_of_eth2] and on PC B, run (also as root) route add -net 10.0.0.0/30 gw [ip_of_eth3]. Also, make sure that IP forwarding is enabled on the server (i.e. /proc/sys/net/ipv4/ip_forward should be 1).
This is of course routing, not bridging, but it is more suitable based on your topology and need.
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
add a comment |
That is easy: do not specify default gateway/default route on PC's A and B. This should keep both A and B from reaching the Internet and each other. To allow A and B to communicate with each other, add static routes on each PC to reach the other's network. Add a static route on PC A to PC B's network, and add a static route on PC B to PC A's network.
Assume that PC A's network is 10.0.0.0/30 and PC B's network is 10.0.0.4/30. On PC A, run (as root) route add -net 10.0.0.4/30 gw [ip_of_eth2] and on PC B, run (also as root) route add -net 10.0.0.0/30 gw [ip_of_eth3]. Also, make sure that IP forwarding is enabled on the server (i.e. /proc/sys/net/ipv4/ip_forward should be 1).
This is of course routing, not bridging, but it is more suitable based on your topology and need.
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
That is easy: do not specify default gateway/default route on PC's A and B. This should keep both A and B from reaching the Internet and each other. To allow A and B to communicate with each other, add static routes on each PC to reach the other's network. Add a static route on PC A to PC B's network, and add a static route on PC B to PC A's network.
Assume that PC A's network is 10.0.0.0/30 and PC B's network is 10.0.0.4/30. On PC A, run (as root) route add -net 10.0.0.4/30 gw [ip_of_eth2] and on PC B, run (also as root) route add -net 10.0.0.0/30 gw [ip_of_eth3]. Also, make sure that IP forwarding is enabled on the server (i.e. /proc/sys/net/ipv4/ip_forward should be 1).
This is of course routing, not bridging, but it is more suitable based on your topology and need.
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
edited Jul 15 '15 at 21:51
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
answered Jul 15 '15 at 21:31
LarssendLarssend
2,35121930
2,35121930
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
add a comment |
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
Unfortunately, I couldn't modify the routing information on my PCs because of an unrelated reason. Thank you for your answer though! I'll keep it here as future reference for people creating similar situations. I managed to find an old router lying around and just connected all three computers to it. That eliminated any need for bridging or routing.
– Alex Shmakov
Jul 15 '15 at 21:58
add a comment |
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