It's there, go get iproute2 (/sbin/ip) if you don't already have it.
Then read the ip-cref RULE section.
On Sat, 25 Mar 2000, Brad Whitehead wrote:
> Hi,
>
> What is the state of support for source routing in linux?
>
> My situation is this: I have two available routes out to the internet. The
> branch occurs after several hops. eg. Packets travel the same route for
> hops 1, 2 and 3, but then can be routed either through router 4 or 5. I
> dont have permission (access) to change the routing tables on any of these
> routers. I would like to be able to choose between router 4 or 5
> on-the-fly. eg. if router 4 goes down, then I would like to be able to
> switch the route to use router 5. The only way I could think of doing this
> is a loose source-route to router 5. I looked for several hours trying to
> find out how this could be done, with no luck, is this not supported in
> linux yet?
>
> The reason I'm posting this to the kernel dev list is; if source routing is
> simply not supported yet, I will write support for it, but want to make
> sure I'm not just duplicating someone elses work. I have done some network
> programming before, but never anything with the linux kernel. Is support
> for source routing something that should be coded into the kernel or a
> user-space app?
>
> I would like to see implementation of this be as flexible as possible, so
> others can use it too :) A simple user-space app to pass requests to
> modify a source-routing table is the simplest solution I have thought of.
> Should the kernel side be an independant module? Or should source-route
> support be a direct part of ipv4?
>
> If anyone has any further ideas (or hints!) please let me know
>
> Thanks,
>
> Brad.
>
>
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