Re: attached gateways

• Subject: Re: attached gateways
• From: Chase <email@hidden>
• Date: Tue, 21 Jun 2005 08:05:16 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

can you point me to something available online?

thanks.

- chase

On Jun 21, 2005, at 7:56 AM, Peter Lovell wrote:

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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