Ip fragmentation and reassembly with winpkfilter

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  • March 10, 2013 at 2:49 pm #5385
    weihao.ma
    Participant

      Hi, i want to archieve the udp-tunnel between client and server, and i don’t want to use mtu-decrement(because of changing this value needs computer reboot), so i set the mtu-decremnt to 0, and i do the following things:

      From the client, i ping the server with a command of “ping 192.168.1.250 -l 1628 -t”, the winpfilter capture the first packet to the server with the IP_MP flag and 1500 ip length. if i want to wrapper the first packet to my udp header to archieve the udp-tunnel, the packet size must be larger than the max-frame-size(1514), and Is possible i fragment the ip packet?

      If i fragment the ip packet in my client, what to do with the server application?

      March 10, 2013 at 4:14 pm #7119
      Vadim Smirnov
      Keymaster

        Yes, you can fragment the resulted packet and send out two packets instead one, server will reassemble it. However, please note that fragmented packets often are blocked by firewalls.

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