I have faced a problem while using Net::RawIP module, I thought that it is not the problem with Net::RawIP module itself and the problem lies with my setup and the way that I use it, so I am posting it here.
I am reading a wireshark dump file using Net::Pcap module,
and I am dumping only the packet to the ethernet interface, using Net::RawIP's bset and send.
I works for some dump files and not for other dump files, it is showing this error
PROBLEM OUTPUT 1

$VAR1 = {
          'len' => 74,
          'tv_usec' => 134541,
          'tv_sec' => 1235622359,
          'caplen' => 74
        };
>#®w;!áüE<²@ÿjP
ùPZ(Ñ0Hk½9å     r[àçÚÌ«½UZP<2E5÷B<
panic: sv_setpvn called with negative strlen at
        /usr/local/lib/perl/5.8.8/Net/RawIP.pm line 500 (#1)
    (P) An internal error.

^[[?1;2cUncaught exception from user code:
        panic: sv_setpvn called with negative strlen at /usr/local/lib
+/perl/5.8.8/Net/RawIP.pm line 500.
 at /usr/local/lib/perl/5.8.8/Net/RawIP.pm line 500
        Net::RawIP::bset('Net::RawIP=HASH(0x814ec28)', '\x{0}#\x{4}\x{
+ae}w;\x{0}!\x{e1}\x{fc}\x{9f}\x{f1}\x{8}\x{0}E\x{0}\x{0}<\x{7}\x{b2}\
+x{0}\x{0}@\x{11}\x{ff}j\x{14}\x{1}P\x{1b}\x{a}\x{80}\x{4}\x{f9}\x{14}
+P\x{14}Z\x{0}(\x{d1}0\x{80}\x{12}\x{93}Hk\x{bd}9\x{e5}\x{9}\x{9f}r[\x
+{e0}\x{e7}\x{da}\x{5}\x{cc}\x{ab}\x{11}...', 'eth0') called at readpc
+ap.pl line 48
        main::handlepacket('Testing', 'HASH(0x840a63c)', '\x{0}#\x{4}\
+x{ae}w;\x{0}!\x{e1}\x{fc}\x{9f}\x{f1}\x{8}\x{0}E\x{0}\x{0}<\x{7}\x{b2
+}\x{0}\x{0}@\x{11}\x{ff}j\x{14}\x{1}P\x{1b}\x{a}\x{80}\x{4}\x{f9}\x{1
+4}P\x{14}Z\x{0}(\x{d1}0\x{80}\x{12}\x{93}Hk\x{bd}9\x{e5}\x{9}\x{9f}r[
+\x{e0}\x{e7}\x{da}\x{5}\x{cc}\x{ab}\x{11}...') called at readpcap.pl 
+line 33
[download]

I also checked that for some dump files the capture length was 1500 and for the other the capture length was 65535 (I found it by using file utility in my unix based system). for those files which has capture length of 65535 the net::rawip is saying this error
PROBLEM OUTPUT 2

$VAR1 = {
          'len' => 60,
          'tv_usec' => 958875,
          'tv_sec' => 1235629906,
          'caplen' => 60
        };
>Â>ðÌ>ð>ð
         x<
Uncaught exception from user code:
                sendto() at /usr/lib/perl5/Net/RawIP.pm line 550.
 at /usr/lib/perl5/Net/RawIP.pm line 550
                Net::RawIP::send('Net::RawIP=HASH(0x814ec28)') called 
+at readpcap.pl line 52
                main::handlepacket('Testing', 'HASH(0x8410004)', '\x{1
+}\x{80}\x{c2}\x{0}\x{0}\x{e}\x{0}\x{14}\x{e}>\x{f0}\x{0}\x{88}\x{cc}\
+x{2}\x{7}\x{4}\x{0}\x{14}\x{e}>\x{f0}\x{1}\x{4}\x{7}\x{3}\x{0}\x{14}\
+x{e}>\x{f0}\x{b}\x{6}\x{2}\x{0}x\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x
+{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\x{0}\
+x{0}\x{0}\x{0}') called at readpcap.pl line 35
[download]

for the second problem I tried increasing the MTU of ethernet interface from 1500 to 65535 but it is saying error

command: "ifconfig eth2 mtu 65535"
output: "SIOCSIFMTU: Invalid argument"

Any idea about this error and any suggestions to track this problem will be helpful to me.