Hello wise ones,

I have written 2 perl scripts , one to start a server and the other to start a client . If I run these two scripts on different machines , they are able to communicate between themselves as desired.

However I want to write a program which forks off the server process and the client processes on machines whose IP addresses I pass as arguments. But that doesn't seem to be working . That is the server process fails with the error "bind: Cannot assign requested address ". Could someone let me know what I'm missing .

I'm suspecting this piece of code in the server script to be the culprit. But cant seem to put what is wrong here . I have tried with pack_sockaddr_in as well. It is also not working.

I'm including only that code which is giving me trouble . The code is failing with the error "bind: Cannot assign requested address" . If I run the same script on a machine whose IP is 10.72.206.79 . It runs fine without any issues. 


#!/usr/bin/perl -w

use strict;

use Socket;


#Subroutines
sub usage ()
{
    die "usage: sock_server.pl [port]";
}
#Declarations
my $argc;
my ($servaddr, $server_port, $server_ip, $server_name, $inaddr);
my $nconns;
my ($buf, $bufsize);
my ($bytesread, $byteswritten, $totalwritten);
my @hostentry ;
#initializations
$server_port     = 12000;
$nconns        = 1;
$bufsize    = 1024;
$buf        = undef;

$argc = @ARGV;
if ($argc > 1) {
    usage();
}

if ($argc == 1) {
    $server_port = $ARGV[0];
}


$server_name = '10.72.206.79' ;
@hostentry = gethostbyname($server_name);
$server_ip = $hostentry[0];

$inaddr = inet_aton($server_ip) or die("inet_aton: $_\n");

$servaddr = pack_sockaddr_in($server_port, $inaddr);

socket(SERVERSOCK, AF_INET, SOCK_STREAM, getprotobyname('tcp'))
    or die("socket: $!\n");

setsockopt(SERVERSOCK, SOL_SOCKET, SO_REUSEADDR, 1)
    or die("setsockopt: $!\n");

bind(SERVERSOCK, $servaddr)
    or die("bind: $!\n");

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In reply to Starting a server on a machine whose IP is specified by girishatreya2005

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