And yet another way. You can capture an incoming connection via tcpdump and write it to file. Then use can use Net::TcpDumpLog to read the tcpdumplog. It'll return some raw packet data in Ethernet/IP/TCP form usually. I took the two examples provided by Brenden Gregg and put them together. If you don't have a tcpdumplog, then use the one provided in the source.

You will need to put this script and the tcpdumplog in the same directory for it to work.

#!/usr/bin/perl
#
# example01.pl - Example of Net::TcpDumpLog. Prints out frame arrival 
+times.
#
# 11-Oct-2003    Brendan Gregg    Created this

use Net::TcpDumpLog;

$log = Net::TcpDumpLog->new(32);    
$log->read("tcpdumplog");        
                
$count = $log->maxindex + 1;
@Indexes = $log->indexes;

print "Log version : ",$log->version,"\n";
print "Linktype    : ",$log->linktype,"\n";
print "Packet count: $count\n\n";

printf "%5s  %25s  %7s %5s  %s\n","Frame","Arrival time","+ MSecs","Dr
+ops",
 "Length";

foreach $index (@Indexes) {
    ($length_orig,$length_incl,$drops,$secs,$msecs) = $log->header($in
+dex);
    $data = $log->data($index);

        $time = localtime($secs);

    $msecs = $msecs / 1000000;
    $length = length($data);

    printf "%5d  %25s  %7.5f %5d  %d\n",$index,$time,$msecs,$drops,$le
+ngth;
}

# example02.pl - Example of Net::TcpDumpLog. Prints out ethernet heade
+rs.
# 11-Oct-2003    Brendan Gregg    Created this

$log->read("tcpdumplog");        
                    
@Indexes = $log->indexes;

printf "%5s  %12s    %12s  %4s  %s\n","Frame","Source","Dest","Type","
+Length";

foreach $index (@Indexes) {
    $data = $log->data($index);

    ### Process Ethernet header
    ($ether_dest,$ether_src,$ether_type,$ether_data) = 
     unpack('H12H12H4a*',$data);
    $length = length($ether_data);

    printf "%5d  %12s -> %12s  %4s  %s\n",$index,$ether_src,$ether_des
+t,
     $ether_type,$length;

}
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