LARTC - May 2004 - Policy based routing support for IPv6 in Linux

Hi all,

I have a dual stacked (IPv4/IPv6) Linux host (S) with two interfaces that can
both be used to reach a destination (D) and are both up. In order to make sure a
packet is transmitted over the correct interface I use policy based routing to
choose the correct routing table based on the IP source address.

The network setup is shown below:


   |---|
   | D |
   |---|
     |  
     |
   |---|
   | R |
   |---|
    / \
   /   \
 |-------|
 |   S   |
 |-------|
  
The two interfaces of S both reside in a different IP subnet.

For IPv4 this works ok, but IPv6 does not seem to interact with the Routing
Policy DataBase (RPDB) as explained in
http://www.policyrouting.org/PolicyRoutingBook/ONLINE/CH09.web.html section 9.2.
Here it is stated that this might be solved in the later releases of the Linux
kernel 2.5 and further. I am using RH 9 (2.4.20-8), 2.4 based kernel so that
might explain why it does not work but before I decide to move to a newer kernel
release I hope someone can help me answer the following questions:

1. Does anyone know if Policy Based Routing in the way it is used here is
supported by the newer Linux kernels for IPv6?
2. Can anyone think of another solution for this?

Greetz,

Boris Kock


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