Hello, Thank you for the imput, but apparently that is not the problem. I have already set the iptables accordingly (and tested it using nc). I have also fired up tcpdump on the target, and followed the instructions (offloading was off), but it still reports bad checksum.
I will continue trying, although I have followed the documentation (or at least I think so). If anybody knows libraries which the source address can be customly set, please let me know. Regards, Mitescu George Dan Fedor Sumkin <qosys....@gmail.com> writes: > Hi all, > > I guess that everything is fine with Net::RawIP. > > tcpdump can't verify checksums if UDP / TCP checksum offloading(TCO) isn't > turned off. > See, for example - > https://sokratisg.net/2012/04/01/udp-tcp-checksum-errors-from-tcpdump-nic-hardware-offloading/ > > > You can also check on the receiver side whenever the packet get's dropped or > captured. > > Regards, > Fedor > > On Sun, Aug 21, 2016 at 5:31 PM, Mitescu George Dan <mitesc...@gmail.com> > wrote: > > Hello, > > I am trying to use Net::RawIP in order to craft UDP packets, which have > a custom source ip. The packets get sent, but tcpdump reports that the > checksum which is automatically computed (according to the docs) is > incorrect. > > There is a single post about this issue on perlmonks, I've also seen > examples on the internet using Net::RawIP for this, so I've figured > that I might be doing something wrong. I also remember Net::RawIP > complain about being compiled for a different Perl version, but I've > solved that by deleting perl5/site_perl/RawIP* and reinstalling the > cpan module. > > You can also give me suggestions about other modules which are as easy > to use as this one for changing the source address. :D > > Regards, > Mitescu George Dan > > -- > To unsubscribe, e-mail: beginners-unsubscr...@perl.org > For additional commands, e-mail: beginners-h...@perl.org > http://learn.perl.org/ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
