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how do i block a port on all IP's except 1?

say I have IP's:

192.168.1 192.168.2

ex: how would i only allow port 21 on 192.168.1 through IP tables or similar?

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1 Answer 1

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iptables supports the -d parameter for this:

iptables -A INPUT -p tcp -d 192.168.0.2 --dport 21 -j ACCEPT
iptables -A INPUT -p tcp --dport 21 -j DROP

This will allow traffic from all sources to IP 192.168.0.2 on port 21. The second line blocks all traffic on port 21. iptables works on a "first match" principle.

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