[Firehol-support] Bridged OpenVPN

Goetz Bock bock at blacknet.de
Tue May 16 06:13:03 BST 2006

On Mon, May 15 '06 at 21:19, Daniel L. Miller wrote:
> While I was checking everything else I could think of, I noticed 
> something.  Because I'm using OpenVPN with a bridged interface, I have 
> two LAN routable interfaces on my firewall.  For purposes of illustration:
> foxy:/etc/iproute2# ip route
> <snip>
> dev br0  proto kernel  scope link  src
> dev eth0  proto kernel  scope link  src
> <snip>
> I thought to myself, "Self, you might remember that the routing table is 
> processed in order.  So if the bridged interface appears first . . . 
> routing Internet requests to internal hosts might get routed via the 
> bridged interface.  Do you HAVE any bridge interface definitions in you 
> firehol.conf file?"
Stupid question: why do you have two interfaces on your "lan".

I'm running a simmilar configuration, but for me the OpenVPN uses tap0
and my lan eth0, both are part of br0 and only br0 appears in the
routing table.

root at box:~# ip route
... dev br0  proto kernel  scope link  src 
route at box~# ip addr
2: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether fe:fd:c0:a8:ff:03 brd ff:ff:ff:ff:ff:ff
3: tap0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue qlen 100
    link/ether ca:fa:08:6c:c9:0f brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue 
    link/ether ca:fa:08:6c:c9:0f brd ff:ff:ff:ff:ff:ff
    inet brd scope global br0
route at box: brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.cafa086cc90f       yes             eth0
I use br0 in my firehol rules, and keep in mind you need a router from
br0 to br0.
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