Hi All,
I have a linux router, configured with two internet connections and two lan segments. I've setup multipath routing as described in http://lartc.org/howto/lartc.rpdb.multiple-links.html
My problem (I think) is that somehow the router will randomly choose incorrect routing paths for different hosts, for example: on my workstation (192.168.1.20), I ssh to a server I have on an external network (157.238.135.60), and my connection locally hangs. On the router, I search the routing cache:
# ip route show cache | grep 157.238.135.60 157.238.135.60 via 207.180.31.137 dev eth0 src 207.180.31.140 157.238.135.60 from 192.168.1.20 tos 0x10 via 10.14.1.1 dev ppp0 src 192.168.1.1 157.238.135.60 from 192.168.1.20 via 207.180.31.137 dev eth0 src 192.168.1.1 192.168.1.20 from 157.238.135.60 dev eth3 src 207.180.31.140
Compare this to cache entries for a host that does work (157.238.135.90): # ip route show cache | grep 157.238.135.90 192.168.1.20 from 157.238.135.90 tos 0x10 dev eth3 src 207.180.31.140 157.238.135.90 via 10.14.1.1 dev ppp0 src 151.203.160.233 192.168.1.20 from 157.238.135.90 dev eth3 src 207.180.31.140 157.238.135.90 from 192.168.1.20 via 10.14.1.1 dev ppp0 src 192.168.1.1 157.238.135.90 from 192.168.1.20 tos 0x10 via 10.14.1.1 dev ppp0 src 192.168.1.1
My question is: why does this happen? what can I do to fix it?
Thanks in advance!
Here's some information from my router:
# ip route
10.14.1.1 dev ppp0 scope link src 151.203.160.233
207.180.31.136/29 dev eth0 scope link src 207.180.31.140
192.168.1.0/24 dev eth3 scope link src 192.168.1.1
10.0.0.0/16 dev eth2 scope link src 10.0.0.1
127.0.0.0/8 dev lo scope link
default
nexthop via 207.180.31.137 dev eth0 weight 2
nexthop via 10.14.1.1 dev ppp0 weight 1# ip rule show 0: from all lookup local 32764: from 151.203.160.233 lookup T2 32765: from 207.180.31.140 lookup T1 32766: from all lookup main 32767: from all lookup 253
# ip route show table T1 207.180.31.136/29 dev eth0 scope link src 207.180.31.140 192.168.1.0/24 dev eth3 scope link src 192.168.1.1 10.0.0.0/16 dev eth2 scope link src 10.0.0.1 127.0.0.0/8 dev lo scope link default via 207.180.31.137 dev eth0 src 207.180.31.140
# ip route show table T2 10.14.1.1 dev ppp0 scope link src 151.203.160.233 192.168.1.0/24 dev eth3 scope link src 192.168.1.1 10.0.0.0/16 dev eth2 scope link src 10.0.0.1 127.0.0.0/8 dev lo scope link default via 10.14.1.1 dev ppp0 src 151.203.160.233
Thanks Again,
-Josh
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