On Sat, 17 Mar 2001, Garrett Wollman wrote:
> <<On Sat, 17 Mar 2001 10:28:25 -0600 (CST), Nick Rogness <[EMAIL PROTECTED]> said:
>
> > Packet 1 comes in through ISP #2 network. It comes into your
> > internal network to machine 1. Machine 1 replies to the
> > packet...but where does it go? It will exit through interface
> > to ISP #1 because of the default gateway. It came in ISP #2 and
> > left out ISP #1. There is your problem.
>
> That's the way Internet routing is supposed to work. If your routing
> table says a packet supposed to go one way, and it really needs to go
> another way, that's *user error* -- if you misconfigure your routing,
> FreeBSD will do what you ask it to; it can't read your mind!
Yes, that is correct. That is how routing is suppose to
happen. However, there should be a workaround available to do
this...without setting up a routing peer with your
upstreams. Unless you are an ISP, you can't just ask your DSL
provider to give you this option. Most upstreams will filter your
traffic so you can't have different source network addresses
coming from your machine to their networks, only the
IP's that they assign to you. SPoofing anyone?
I am trying to proactively find a solution to this. Whether it is
doable or not is another thing. Actually, I know it is doable
because I'm doing it as we speak using 3 natd's, but it is ugly.
After all, this seems to be a common setup with FreeBSD. If you
want to BGP peer with someone, buy a Cisco.
Nick Rogness <[EMAIL PROTECTED]>
- Keep on routing in a Free World...
"FreeBSD: The Power to Serve!"
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