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Re: attached gateways
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Re: attached gateways


  • Subject: Re: attached gateways
  • From: "Peter Lovell" <email@hidden>
  • Date: Tue, 21 Jun 2005 08:56:43 -0400

On Tue, Jun 21, 2005, Chase <email@hidden> 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

Have a look at Unix Network Programming, Vol 1 3rd ed (Stevens) chapters
17 and 18.

Mac OS X uses the sysctl mechanism described (with example code) in there.

Regards.....Peter

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