LARTC - Mar 2007 - ip route config question, forcing src address

I''m trying to use ip route to setup a single interface with two ip
addresses.  I currently have:

/ # /usr/sbin/ip address show
1: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
1000
    link/ether 00:19:03:00:27:10 brd ff:ff:ff:ff:ff:ff
    inet 128.0.0.1/16 brd 128.0.255.255 scope global eth0:1
    inet 172.17.31.84/24 brd 172.17.31.255 scope global eth0
2: lo: <LOOPBACK,UP,10000> 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

/ # /usr/sbin/ip route
172.17.31.0/24 dev eth0  proto kernel  scope link  src 172.17.31.84
128.0.0.0/16 dev eth0  proto kernel  scope link  src 128.0.0.1
default via 172.17.31.1 dev eth0

/ # /usr/sbin/ip route show table local
broadcast 172.17.31.255 dev eth0  proto kernel  scope link  src 172.17.31.84
broadcast 127.255.255.255 dev lo  proto kernel  scope link  src 127.0.0.1
broadcast 128.0.0.0 dev eth0  proto kernel  scope link  src 128.0.0.1
local 128.0.0.1 dev eth0  proto kernel  scope host  src 128.0.0.1
broadcast 172.17.31.0 dev eth0  proto kernel  scope link  src 172.17.31.84
broadcast 128.0.255.255 dev eth0  proto kernel  scope link  src 128.0.0.1
local 172.17.31.84 dev eth0  proto kernel  scope host  src 172.17.31.84
broadcast 127.0.0.0 dev lo  proto kernel  scope link  src 127.0.0.1
local 127.0.0.1 dev lo  proto kernel  scope host  src 127.0.0.1
local 127.0.0.0/8 dev lo  proto kernel  scope host  src 127.0.0.1

What I''d like is to have it so that the src address is always
172.17.31.84
for both 172.17.31.0/24 & 128.0.0.0/16.

So I modify the routes to get:

/ # /usr/sbin/ip route show
172.17.31.0/24 dev eth0  proto kernel  scope link  src 172.17.31.84
128.0.0.0/16 dev eth0  proto kernel  scope link  src 172.17.31.84
default via 172.17.31.1 dev eth0

however if the dest is 128.0.0.1 the src is still 128.0.0.1:

/ # /usr/sbin/ip route get 128.0.0.1
local 128.0.0.1 dev lo  src 128.0.0.1
    cache <local>  mtu 16436 advmss 16396 metric 10 64

Is there any way to modify the routes so this ''loopback'' src
becomes
172.17.31.84?

I''m running a 2.6.20 kernel.

thanks

- kumar

On Tue, Mar 06, 2007 at 16:32:50 -0600,
  Kumar Gala <galak@kernel.crashing.org> wrote:
> 
> What I''d like is to have it so that the src address is always
172.17.31.84
> for both 172.17.31.0/24 & 128.0.0.0/16.
ip addr add dev eth0 172.17.31.84/24
ip addr add dev eth0 172.17.31.84 peer 128.0.0.0/16

Hello !!

On my linux gateway i have 2 adsl connections.

how I make traffic that leaves to port 80 has left on link1 and the 
remaining left on link2 ? without marking packets with iptables...

it´s possible ?!

Thanks !

-- 
Sds.

Alexandre J. Correa
Onda Internet
www.ondainternet.com.br
Linux User ID #142329