iproute2, 2 inet lines, 2 interfaces, 2 ssh tunnels
- From: "cyphunk" <cyphunk@xxxxxxxxx>
- Date: 27 Mar 2007 02:16:22 -0700
When sshd deals with port forwarding and tunneling it seems to re
encapsulate the outgoing packets and use the default route for
determining which interface or internet line to send it out on. I
have two internet lines and I want to change this behavior so that
sshd will forward the tunnel back out through the same internet line
the tunnel was setup on.
DETAIL:
the setup i have is a server connected to two different ADSL lines
using two different network cards. I would like to ssh through adsl_1
and have the tunnel (dynamic) go back out that same line. in the same
manner id like the tunnel setup through adsl_2 go back out through
adsl_2. The problem is that sshd uses the default at all times when
reencapsulating packets.
Currently I have iproute2 configured as follows:
ip route flush table adsl1
ip route flush table adsl2
#setup table for ADSL1, 1.2 is the network card of the linux pc
ip route add 192.168.1.0/24 dev eth0 src 192.168.1.2 table adsl1
ip route add default via 192.168.1.1 table adsl1
#setup table for ADSL2, 2.2 is the network card of the linux pc
ip route add 192.168.2.0/24 dev eth1 src 192.168.2.2 table adsl2
ip route add default via 192.168.2.1 table adsl2
#setup route rules:
ip rule add from 192.168.1.2 table adsl1
ip rule add from 192.168.2.2 table adsl2
The only solution I can think of as yet is to create iptable rules per
sshd PID. This is ugly and i am guessing will require extensive
debugging to deal with child processes.
.
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