Egress shaping over multiple interfaces?

Linux Advanced Routing and Traffic Control

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Hello,

After reading the excellent HOWTO I got traffic shaping working nicely over 
ethernet devices on a test setup. I can't put this setup live though, because 
our main firewall has three 2mbit hdlc interfaces instead of a single device.

We are using multipath routing using iproute2 nexthop at the moment, and that 
works fine for firewalling. But now I have a need for shaping and shaping 
only works over a single interface it seems and not over multiple interfaces.

According to the HOWTO I can setup a teql device to bundle the hdlc0-2 into a 
single teql0 device, but that requires an extra combined IP address at both 
sides it seems.

The question is whether I can get away with setting up the teql device over 
the three hdlc IPs with an ip on the teql device that's either fake or one of 
our class C subnet (maybe even reuse the IP of the ethernet card on the other 
end), without having our provider to change their config.

The round robin routing is not the problem, we have that working correctly for 
quite a while already, it's the fact that teql requires an extra IP which 
nexthop routing doesn't that bothers me a bit. And since this is a live 
router I am not going to take risks by messing with it without proper 
research...

Is there any advice to give me here? Or do you need more information first?

Thanks in advance for any help,
-- 
Martijn

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