Docker networking

Bridged interfaces

Example

brctl command

heth@ub1:~$ brctl show
bridge name     bridge id               STP enabled     interfaces
br-501d0044fabe         8000.0242a9d6ae8d       no              veth413579c
                                                        veth6d6fce4
                                                        vethd3cbce2
br-ded1f2526def         8000.0242a675d928       no
crc             8000.525400fdbed0       yes
docker0         8000.02420af91289       no              veth180ce2d
virbr0          8000.5254009d12fa       yes
heth@ub1:~$ brctl showmacs br-501d0044fabe
port no mac addr                is local?       ageing timer
  1     02:42:ac:13:00:02       no                 3.96
  2     02:42:ac:13:00:03       no                 3.96
  1     46:b0:4b:02:26:99       yes                0.00
  1     46:b0:4b:02:26:99       yes                0.00
  2     96:fb:5a:ff:2c:9d       yes                0.00
  2     96:fb:5a:ff:2c:9d       yes                0.00
  3     aa:2c:8a:2b:06:81       yes                0.00
  3     aa:2c:8a:2b:06:81       yes                0.00

bridge command

heth@ub1:~$ bridge -d  vlan
port              vlan-id
virbr0            1 PVID Egress Untagged
                    state forwarding
crc               1 PVID Egress Untagged
                    state forwarding
docker0           1 PVID Egress Untagged
                    state forwarding
br-ded1f2526def   1 PVID Egress Untagged
                    state forwarding
veth180ce2d       1 PVID Egress Untagged
                    state forwarding
br-501d0044fabe   1 PVID Egress Untagged
                    state forwarding
veth413579c       1 PVID Egress Untagged
                    state forwarding
vethd3cbce2       1 PVID Egress Untagged
                    state forwarding
veth6d6fce4       1 PVID Egress Untagged
                    state forwarding

Links

• https://developers.redhat.com/articles/2022/04/06/introduction-linux-bridging-commands-and-features#