Marc Chanove wrote:
> Hi !
>
> We have configure 2 VLAN on a switch (one for a future private network and an
> other for the DMZ).
> For the moment, addresses in the both VLAN are in the same address domain.
> I try to bridge them, but an interface is always entering and staying in
> blocking state.
> The configuration is as follow :
> On the switch port 23 belongs to VLAN1 and port 20 to VLAN2.
> On the linux box (debian) 2 NIC. File /etc/network/inferfaces :
> auto br0
> iface br0 inet static
> address X.Y.Z.T
> netmask 255.255.255.0
> broadcast X.Y.Z.255
> gateway X.Y.Z.U
> bridge_ports all
> When I bring up br0 interface :
> Jun 27 08:41:14 pollux kernel: device eth0 entered promiscuous mode
> Jun 27 08:41:14 pollux kernel: eth0: Setting promiscuous mode.
> Jun 27 08:41:14 pollux last message repeated 4 times
> Jun 27 08:41:14 pollux kernel: device eth1 entered promiscuous mode
> Jun 27 08:41:14 pollux kernel: eth1: Setting promiscuous mode.
> Jun 27 08:41:14 pollux last message repeated 4 times
> Jun 27 08:41:14 pollux kernel: br0: port 2(eth1) entering listening state
> Jun 27 08:41:14 pollux kernel: br0: port 1(eth0) entering listening state
> Jun 27 08:41:15 pollux kernel: br0: port 2(eth1) entering blocking state
> Jun 27 08:41:29 pollux kernel: br0: port 1(eth0) entering learning state
> Jun 27 08:41:44 pollux kernel: br0: port 1(eth0) entering forwarding state
>
> I don't understand why eth1 is in blocking state. Any suggestion ?
>
> Thanks a lot.
Do you have such a configuration?
+------+
-------|switch|--------
-------- / +------+ \ --------
| |/ \ | |
| LAN1 | | LAN2 |
| |\ / | |
-------- \ +------+ / --------
-------|bridge|--------
+------+
If so then it's clear: you have a loop and - if the switch doesn't do STP -
the bridge sees packets on the originating LAN and an the other because
packages are forwarded by the switch!
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