Hello monks. I'm having a bit of a problem with Net::RawIP and getting the proper ip/udp checksum to generate correctly. According to the documentation, setting "check => 0" would result in the checksum being calculated automatically. I've been trying different combinations of options (setting len, ttl, tos, etc..) with no luck. What am i missing ? Thanks for any/all help.
- Will. 

 
use Net::RawIP;

my $packet = new Net::RawIP({udp=>{check => 0}});

$packet->set({
        ip => {
                saddr => "192.168.10.10",
                daddr => "192.168.10.20"
            },
        udp => {
               source => 6544,
               dest => 514,
               data => 'test123'
            }
        });

$packet->send;

[download]

tcpdump shows: 

13:24:07.572481 IP (tos 0x10, ttl 55, id 45453, offset 0, flags [DF], 
+proto UDP (17), length 35)
    192.168.10.10.6544 > 192.168.10.20.514: [bad udp cksum 8!] [|syslo
+g]

[download]
Tested on FreeBSD 9.1 and Net-RawIP-0.25,1

In reply to Net::RawIP - invalid checksum ? by willambender

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