Can a network client specify an IP on the source side?
- From: yong321@xxxxxxxxx
- Date: 28 Apr 2007 07:34:54 -0700
When I initiate a network connection to a remote server, is there a
way to specify an IP address on the source side? Take a Perl snippet
as an example (modified from "Programming Perl"):
#!/usr/local/bin/perl -w
require 5.002;
use Socket;
$remote = shift || 'locahost';
$port = shift || 2345;
$iaddr = inet_aton($remote) or die "No host: $remote";
$paddr = sockaddr_in($port, $iaddr);
$proto = getprotobyname("tcp");
socket(SOCK, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";
#Does it make sense to bind the socket with an IP on the source? How?
bind(SOCK, sockaddr_in(0, "10.6.143.111")) or die "bind: $!";
connect(SOCK, $paddr) or die "connect: $!";
print while <SOCK>;
close SOCK or die "close: $!";
exit;
I've never seen a bind() call on a client. I added it because I want
to designate a specific IP on a multihomed server. But it throws
error:
$ client.pl some.destination.example.com 22
bind: Cannot assign requested address at client.pl line <line number
pointing to the bind() line>.
That IP does exist as shown in ifconfig output. I suspect the first
argument to sockaddr() should not be 0. Any help is appreacited.
Yong Huang
[This message was posted to another group without a definitive answer]
.
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