Re: Routing problem with udp, and a multihomed host in 2.4.20

[Neil Brown]

On  February 12, [e-mail] wrote:
> On Wed, 2003-02-12 at 15:18, Neil Brown wrote:
> > Is this a bug, or is there some configuration I can change?
> 
> Specify the correct 'src' parameter in your 'ip' route
> command invocations.

Thanks... but I think I need a bit more help.

bartok # ./ip route show
129.94.232.0/24 via 129.94.172.66 dev eth1 
129.94.242.0/24 dev eth0  proto kernel  scope link  src 129.94.242.45 
129.94.241.0/24 via 129.94.174.2 dev eth1 
129.94.172.0/22 dev eth1  proto kernel  scope link  src 129.94.172.12 
129.94.208.0/22 dev eth2  proto kernel  scope link  src 129.94.208.2 
default via 129.94.242.1 dev eth0 
bartok # ip addr show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:10:4b:1c:a3:a4 brd ff:ff:ff:ff:ff:ff
    inet 129.94.242.45/24 brd 129.94.242.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:a0:c9:8f:7f:3c brd ff:ff:ff:ff:ff:ff
    inet 129.94.172.12/22 brd 129.94.242.255 scope global eth1
4: eth2: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
    link/ether 00:90:27:37:bb:d5 brd ff:ff:ff:ff:ff:ff
    inet 129.94.208.2/22 brd 129.94.242.255 scope global eth2

The client in question is 129.94.211.194
It sends a UDP request to 129.94.172.12
The reply, addressed to 129.94.211.194 causes ARP requests on bartok's
eth1

Surely the route that applies is the 4th one, which seems to have a
correct 'src' parameter.

BTW, The routes were all created with 'route', not 'ip', incase it
matters.

NeilBrown