"Discovering" the local IP on a multi-homed host.
Christopher R. Hertel
crh at ubiqx.mn.org
Thu Mar 27 06:25:50 GMT 2003
Is there a simple, portable way to discover the outgoing IP address of a
datagram socket on a multi-homed host?
...that is...
I want to send a browser message. I know the destination address (a host
address or the local broadcast address). Once I open the socket I can use
getsockname(2) to discover the outgoing port number (that is, the source
port). The problem is that getsockname(2) returns INADDR_ANY (0.0.0.0),
which is reasonable since the system doesn't know the outbound interface
address until the message gets routed.
So, is there any portable way to ask the system which IP address (which
interface, I suppose) will be used as the source address before sending
the datagram?
Chris -)-----
--
Samba Team -- http://www.samba.org/ -)----- Christopher R. Hertel
jCIFS Team -- http://jcifs.samba.org/ -)----- ubiqx development, uninq.
ubiqx Team -- http://www.ubiqx.org/ -)----- crh at ubiqx.mn.org
OnLineBook -- http://ubiqx.org/cifs/ -)----- crh at ubiqx.org
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