Rejecting packets

hi,
I'm trying to develop a content filter.The problem is after dropping the packets i need to send "host unreachable" icmp message.But i don't know how to send that request.Can anybody tell how to send a icmp message of "host unreachable".

Thanx in advance.............

With Hping its really easy.
Then you can even make it in a BASH script.

I hope that helps.

Cheers,
Robin

Quote:

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Originally Posted by bharat.bvrit

hi,
I'm trying to develop a content filter.The problem is after dropping the packets i need to send "host unreachable" icmp message.But i don't know how to send that request.Can anybody tell how to send a icmp message of "host unreachable".

Thanx in advance.............

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If you are planing on using iptables for this purpose I suggest using the "-j REJECT" flag, which will automatically send the appropriate ICMP message.

Here is what you are looking for:

Code:

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-j REJECT --icmp-host-unreachable

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