Rejecting packets

[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.............

[RobinVossen]

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

I hope that helps.

Cheers,
Robin

[Master Blaster]

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.............

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.

[Lazydog]

Here is what you are looking for:

-j REJECT --icmp-host-unreachable