Hi,
If you type "netstat -rn" at the command line you will get the
routing table. Usually, the gateway's IP address is a function of the
destination IP address, and the interface to use is a function of the
gateway's IP address. There can also be multiple gateways attached to a
single interface. Usually, a single gateway is designated as the
"default" route, and all packets destined for that gateway are routed
through the same interface. The routing table should tell you exactly
where each packet will be routed.
-Dan
On Tue, 21 Jun 2005, Chase wrote:
> How can I found out (in C or at the commandline) what the gateway
> address is that is attached to a particular interface on a multihomed
> system?
>
> If en0 is attached to one gateway and en1 to another, how can I get
> the address of each unique gateway at will?
>
> In other words, how would I answer the following question: "What is
> the address of the gateway G(X) attached to interface X ?"
>
> I need to know the C calls, but if all you know is how to do it at
> the commandline, that will work, since I can look up the code for
> that tool in the Darwin CVS tree.
>
> That said, if you know both ways, of course the C way would be a
> shorter path for me to take.
>
> Thanks in advance for the help.
>
> - Chase
>
>
>
>
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