Re: Routing w/ 2 external interfaces?

[Chuck Yerkes <chuck@snew.com>]

Hmm the RIGHT way is to get an AS number, use
BGP with Zebra or Gated and never NAT (or at
least NAT to a common address taht both ISPs
can route.

Natting makes doing proper routing ny impossible. ISPs
usually aren't big on it.

Welcome to the consuper internet.

Quoting arlen fletcher (arlen.fletcher@att.net):
> I'm running an OBSD 2.9 machine w/ 2 external interfaces - call them xl0 and
> xl1.
> 
> xl0 goes to ISP 1, and xl1 goes to ISP 2.  Obviously they're on different
> networks.
> I have ipnat mapping external addresses to internal server addresses, and I
> have DNS servers at each ISP.
> 
> The idea was that if one ISP went down, inbound traffic would be routed to
> the addresses provided by the ISP that was still up.
> 
> My question is: will OpenBSD know how to route the return packets out the
> interface they came in on?  I'm concerned that my default route will be a
> problem if it's pointing to the ISP that's down.
> 
> TIA!!!