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Blocking port in iptables
This is a discussion on Blocking port in iptables within the Linux software forums, part of the Linux Getting Started category; hi i'm trying to block icmp applying this rule iptables -A INPUT -p icmp -s \! 192.168.2.26 -j DROP i ...
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07-17-2006, 04:35 PM
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Blocking port in iptables
hi
i'm trying to block icmp applying this rule iptables -A INPUT -p icmp -s \! 192.168.2.26 -j DROP i want to allow this host 192.168.2.26 except all, but this rule don't work it block also icmp request from this host. Any Help... Regards Asim 
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07-17-2006, 07:22 PM
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So you are applying rules on host having ip 192.168.2.26?
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07-17-2006, 11:00 PM
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If default INPUT and OUTPUT policy is drop then you should use following rules for ICMP ping request:
Code:
SERVER_IP="192.168.1.50" CLIENT="192.168.1.10" iptables -A INPUT -p icmp --icmp-type 8 -s $CLIENT -d $SERVER_IP -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -p icmp --icmp-type 0 -s $SERVER_IP -d $CLIENT -m state --state ESTABLISHED,RELATED -j ACCEPT
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