I've been looking around, and I can't find any way to modify the Time To Live value of a TCP socket. The only references I've found online refer to IO::Socket::Multicast, which aren't helpful. It also doesn't help that searching for TTL often brings up words such as 'little'. Is this possible to do, or am I can to have to use another module - if so, which would you recommend. Thanks, ~muto Update: Ok, I've been looking at using using Socket. However, when I run my script, I get the following error: Your vendor has not defined Socket macro IP_TTL, used at K:\perl\firewalk.pl line 17 Anyone know what's wrong? I'm on Activeperl 5.10, Windows XP SP 2. 
#!/usr/bin/perl -w

use Socket;

$remote = $ARGV[0];
$port = 80;



if($port =~ /\D/) { $port = getservbyname($port, 'tcp') }
die "no port specified" unless $port;
$iaddr = inet_aton($remote) || die "$remote";
$paddr = sockaddr_in($port, $iaddr);
$proto = getprotobyname('tcp');
socket(SOCK, PF_INET, SOCK_STREAM, $proto) || die "cannot open socket 
+: $!";
setsockopt (SOCK,IPPROTO_IP,IP_TTL,1);
connect(SOCK, $paddr) || die "cannot connect to $remote: $!";
close(SOCK);

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In reply to IO::Socket TTL? by muto

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