Routing question

[Ben Timby]

Perhaps if you post more info, we can come up with creative solutions 
for you. My big question is why?

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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