Sorry this is so long, I wanna be specific.
I've got a routing issue that I think should be really easy
to solve. It's baffled me for over 4 hours now, so I'm
going to ask.
eth0 - my cable internet 24.247.240.235
ppp0 - 208.31.142.43
ppp1 - 208.31.142.23
My employer makes money for having my modems connected.
That's a long story, and hard to explain. Anyway, ppp0 and
ppp1 are just sitting there doing nothing.
The other day my cable went out, and with it, my default
route. I tried to telnet into my ppp devices, but they
didn't work because the return path was trying to go through
the cable.
Even when the cable is working, I can't telnet into the ppp
devs unless I make a specific route.
route add 208.31.142.2 gw 208.31.142.43 dev ppp0
That may look odd, trust me, my ip is my gateway. Anyhoo,
after that it works great. That's less than desireable
though -- then all traffic to my webserver goes through
ppp0. What I really want, is any traffic that SYNs to
208.31.142.43 from the outside, should automagically route
back out that device. I hope that made sense.
So, I tried to mark the packets with 0x04 then route them
based on that...
iptables -t mangle -A PREROUTING -p tcp -d 208.31.142.43 -j TOS --set-tos 0x04
ip route add default via 208.31.142.43 dev ppp0 tos 0x04
I've had success routing on those tos values before. But
this solution didn't work for obvious reasons. I need to
mark the whole session, not just packets that are destined
to 208.31.142.43.
Questions:
Is there a way to mark the entire session in such a way that
I can do sorta this type of routing?
Is there a cleaner way to make sure that:
a) my default route for anything starting from my box goes
out the cable modem...
b) any traffic initiated to one of the ppp devs
automagically routes back out the same ppp dev?
--
If riding in an airplane is flying, then riding in a boat
is swimming. 33 jumps, 6.7 minutes of freefall, 14.4 ff vertical miles.
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