AFAIK, you cannot have more than one default gateway, unless you are using netgraph to balance between network interfaces. However, you could NAT C & D to their respective "public" interfaces. If E is a real IP, then the NATed traffic should flow to that interface.
I would suggest using pf, as it is a most excellent firewall package. Here is the section of a PF guide regarding NAT.
http://www.openbsd.org/faq/pf/nat.html
Your rules would look like this (these are from memory, so sanity check them):
-- #define your interfaces as macros: A = "fxp0" B = "fxp1" C = "fxp2" D = "fxp3" E = "fxp4"
#define your NAT translations using our macros: nat on $A from ($C:network) to any -> $A nat on $B from ($D:network) to any -> $B
#define your filtering rules: ... --
However, you will find that route add will not allow multiple default routes. You must use another package to allow for that, or at least it is beyond my knowledge. Let me know if you figure it out, I would be very interested.
Leon Botes wrote:
I have a box with 5 nics. Cal them A,B,C,D,E. A & B are different internet connections. E is a connection to a mail server on a public /29 C & D are connections for 2 differnet client networks.
Is it possible to have all traffic coming in via C sent to a default gateway on A's network and all traffic coming in via D sent to a default gateway on B's network. And secondly will both client networks be able to see the E/29?
If so how?
Thanks Leon
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