At 02:48 19-2-2002 -0600, Nick Rogness wrote:
>On Sun, 17 Feb 2002, Zviratko wrote:
>
> >
>[SNIP]
> >
> > I will try that, but I guess default route has precedence over ipfw.
>
> Not in the case of ipfw fwd. The routing decision seems to be
> made before ipfw fwd changes the packet.
That's correct, I use a few fwd rules to have packets return on the correct
pipe on a dual-homed machine. Basically if the source address is on a
different pipe than my default gateway and the destination is not the local
subnet I fwd it to the other router. Works VERY sweetly.
BTW, the fact that ng_one2many works for loadsharing over 2 cable modems
means that your ISP is lazy with checking things (I think, I just woke up
so thought processes are not doing too well yet =) ).
What you could have done as well is tell natd to spread the connections
over your 2 internet IPs, and then using fwd based on src to send to the
right cable modem. But this would require both cable modems to have a
different default gateway. If they have default gateway you could use
ng_bpf to look at src address and sending it out the right ng_ether node.
That *should* work even if your ISP does hard checks on whether or not
incoming traffic comes in on the right cable modem. It will not spread a
single connection over both modems, but it will spread load over both
modems for returning packets, which I don't think your solution does.
Doc
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