Hi freebsd-hackers. (Sorry for cross posting, but I got no reply when posting to freebsd-questions)
I'm implementing a NAT (1 ip - 1 ip) like router. I have chosen to use pcaplib to pick up the packets. I have an implementation which picks up the packets, inspects them, rewrites the destination/source ip-addresses and sends them out on the repective interface. The problem I'm facing however is that my interfaces are answering to e.g. icmp-echo (ping) automatically, and I don't know how to turn this behaviour off. What I want to happen is that if A pings C, my router B in between should simply forward the packets w/o any automatic reactions. A --> B --> C So that if e.g. C is down, no echo-reply is sent back (or if C is up, that C is actually sending the echo-reply. Does any one know how to turn off the automatic replies (ICMP and whatever else I haven't forseen yet) or does any one know where I can find out more about the issue? Thank you // Javier
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