Dear Experts,

I am trying to implement a complex policy routing using
"ip route" command. My problem is the changes could not
be saved permanently.
I have change and experimenting to change the (policy) routing tables. But every reboot will reset the
routing table to its default state.

I already search this forum for the same case.
my found reference is :
http://www.linuxquestions.org/questi...+routing+table

But it is still using "route" command, not "ip route".

for policy routing, I have read and study from :
http://linux-ip.net/
( Policy Routing tables is in chapter 4.8 )

Is there any command to save the changes into the routing table ? or Is there something I miss from my references ?

Thank you in advance.
I am looking forward to hear from you.

Well, if you can't figure out how to save these settings "your distro's way", then you can just write all the commands you use to a file and have this file executed as a script on machine boot. Put this file somewhere in /etc/init.d/ or /etc/rc*.d/ depending on your distribution.

Mandrake & Redhat have directories for pre-up and post-up scripts.
You will have to decide how much to split the files so that the routing is still correct if you manually bring an interface down. If that's not going to ever happen, add it to the runlevel startup scripts at an approprite position.

Make sure any script that runs has the last line "ip route flush cache" or you'll get stale routing info making some interesting problems.

Dear r0b0 and Peter Robb,

Thank you for replying.
I am using Fedora Core 3 for this case.
As a temporary solution, I just modify the default routing table with a script added into /etc/rc.d/rc.local.

dear Peter Robb :
regarding the initial startup script you mentioned,
is it : /etc/sysconfig/network-scripts/ifcfifup-routes ?
or /etc/sysconfig/network-scripts/ifup-routes ?

Should I modify this file ?

Thank you in advance.

In rc.local is fine if the interfaces are not expected to go up and down during a normal day..

Open ifup-routes and read the script it contains. You will see references to either $1-route or route-$1. In this case $1 is the interface that is being set.

They are designed to make dynamic changes for interfaces that go up & down regularly, eg vpn, ppp, ipsec, dsl etc.
If yours don't, it's safer to use rc.local and set it once.