2013/12/18 Rafał Miłecki <[email protected]>:
> Some routers (a lot of/all Broadcom's BCM47xx based models) have only
> a one network card attached to a switch. In such situation you usually
> use one VLAN for WAN port and another VLAN for LAN ports.
>
> The problem is that WAN is a virtual VLAN interface and it's always
> up. Even if I disconnect ethernet cable from the WAN, eth0.X is still
> up.
>
> Do you have any idea how this could be improved?
> Could we for example keep a list of VLANs with only one port assigned
> and adjust VLAN interface state to match current port state? Is this
> the right thing to do?
> How otherwise we can know that WAN is disconnected/not working?
Or maybe you have some other idea how we can handle refreshing IP
address on VLAN interface? Currently once-assigned IP doesn't change
until I restart network manually.
##### State after booting with WAN disconnected #####
root@OpenWrt:/# swconfig dev eth0 show | grep port
ports: 0x011f
link: port:0 link:down
link: port:1 link:down
link: port:2 link:down
link: port:3 link:down
link: port:4 link:down
link: port:5 link:down
link: port:6 link:down
link: port:7 link:down
link: port:8 link:up speed:1000baseT full-duplex
ports: 1 2 3 4 8t
ports: 0 8t
root@OpenWrt:/# ifconfig eth0.2
eth0.2 Link encap:Ethernet HWaddr C8:3A:35:37:C1:88
inet6 addr: fe80::ca3a:35ff:fe37:c188/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:5124 (5.0 KiB)
##### After connecting WAN to 100Mb/s router #####
root@OpenWrt:/# swconfig dev eth0 show | grep port
ports: 0x011f
link: port:0 link:up speed:100baseT full-duplex auto
link: port:1 link:down
link: port:2 link:down
link: port:3 link:down
link: port:4 link:down
link: port:5 link:down
link: port:6 link:down
link: port:7 link:down
link: port:8 link:up speed:1000baseT full-duplex
ports: 1 2 3 4 8t
ports: 0 8t
root@OpenWrt:/# ifconfig eth0.2
eth0.2 Link encap:Ethernet HWaddr C8:3A:35:37:C1:88
inet addr:192.168.7.210 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::ca3a:35ff:fe37:c188/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:29 errors:0 dropped:0 overruns:0 frame:0
TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5076 (4.9 KiB) TX bytes:10546 (10.2 KiB)
##### After disconnecting WAN - please note IP is still set! #####
root@OpenWrt:/# swconfig dev eth0 show | grep port
ports: 0x011f
link: port:0 link:down
link: port:1 link:down
link: port:2 link:down
link: port:3 link:down
link: port:4 link:down
link: port:5 link:down
link: port:6 link:down
link: port:7 link:down
link: port:8 link:up speed:1000baseT full-duplex
ports: 1 2 3 4 8t
ports: 0 8t
root@OpenWrt:/# ifconfig eth0.2
eth0.2 Link encap:Ethernet HWaddr C8:3A:35:37:C1:88
inet addr:192.168.7.210 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::ca3a:35ff:fe37:c188/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30 errors:0 dropped:0 overruns:0 frame:0
TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5152 (5.0 KiB) TX bytes:10948 (10.6 KiB)
##### After connecting WAN to a different 1000Mb/s router - IP wasn't
renewed! #####
root@OpenWrt:/# swconfig dev eth0 show | grep port
ports: 0x011f
link: port:0 link:up speed:1000baseT full-duplex auto
link: port:1 link:down
link: port:2 link:down
link: port:3 link:down
link: port:4 link:down
link: port:5 link:down
link: port:6 link:down
link: port:7 link:down
link: port:8 link:up speed:1000baseT full-duplex
ports: 1 2 3 4 8t
ports: 0 8t
root@OpenWrt:/# ifconfig eth0.2
eth0.2 Link encap:Ethernet HWaddr C8:3A:35:37:C1:88
inet addr:192.168.7.210 Bcast:192.168.7.255 Mask:255.255.255.0
inet6 addr: fe80::ca3a:35ff:fe37:c188/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30 errors:0 dropped:0 overruns:0 frame:0
TX packets:66 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5152 (5.0 KiB) TX bytes:11434 (11.1 KiB)
root@OpenWrt:/# /etc/init.d/network restart
[ 124.672000] br-lan: port 1(eth0.1) entered disabled state
[ 124.684000] device eth0.1 left promiscuous mode
[ 124.688000] device eth0 left promiscuous mode
[ 124.692000] br-lan: port 1(eth0.1) entered disabled state
[ 130.936000] device eth0.1 entered promiscuous mode
[ 130.940000] device eth0 entered promiscuous mode
[ 130.952000] br-lan: port 1(eth0.1) entered forwarding state
[ 130.956000] br-lan: port 1(eth0.1) entered forwarding state
[ 132.368000] libphy: bgmac-0-0:1e - Link is Up - 1000/Full
[ 132.960000] br-lan: port 1(eth0.1) entered forwarding state
root@OpenWrt:/# ifconfig eth0.2
eth0.2 Link encap:Ethernet HWaddr C8:3A:35:37:C1:88
inet addr:192.168.3.210 Bcast:192.168.3.255 Mask:255.255.255.0
inet6 addr: fdb6:b3e3:6faf:0:ca3a:35ff:fe37:c188/64 Scope:Global
inet6 addr: fe80::ca3a:35ff:fe37:c188/64 Scope:Link
inet6 addr: fdb6:b3e3:6faf::487/128 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1506 (1.4 KiB) TX bytes:2658 (2.5 KiB)
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