how to block packets

This is a discussion on how to block packets within the C++ Programming forums, part of the General Programming Boards category; hi, i am trying to develop an application to block network packets(using c++)(as in a firewall), with the help of ...

  1. #1
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    how to block packets

    hi,
    i am trying to develop an application to block network packets(using c++)(as in a firewall), with the help of pcap library but only able to capture the packet not block it.

    can somebody suggest some solution to it, like which library to use??

    thanks in advance.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Well knowing which OS and compiler you're using would be a start.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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    missing info

    Quote Originally Posted by Salem View Post
    Well knowing which OS and compiler you're using would be a start.
    using ubuntu 8.10 and g++ compiler.

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    It appears libpcap is just for capturing packets, and not controlling them, as you mentioned. You'll probably need a lower-level library. Look into iptables and netfilter, to see if you can interface with them to control (reject) packets.

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