[NCLUG] [OT] Re: Question about IP forwarding

[Bob Proulx]

Marcio Luis Teixeira wrote:
> ... but TCP expects the ACK to be delivered to the same machine that
> sent the original packet.

It must be using a combination of ethernet address and interface in
the calculation.  Probably an anti-spoofing enhancement.  There still
might be a way to configure it in the linux kernel.  But of course
then if you are locally configuring the machine you might as well add
a local route and avoid all of the issues instead.

> I thought I was being clever by setting up the routing the way I
> did, but I guess I shot myself in the proverbial foot.

I wouldn't be down about it.  I think you were being clever and had a
good shot at pulling it off.  And you and the rest of us along with
you learned some good stuff because of it.  That is always worthwhile.

Bob