I am running redhat 7.3 everything is working properly until loading the iptables rules. After loading the rules I am taking a big performance hit. It can take anywhere from 10 - 30 seconds for my server to display the results of "iptables -L". This wasn't happening prior to the rules being loaded. Trying to open a shell has the same results as well as many other things.
I am loading the iptables rules from webmin. After disabling the rules using "iptables -P INPUT ACCEPT" and "iptables -F" I no longer have a performance issue. I have included the contents of iptables below.
*filter
:FORWARD ACCEPT [0:0]
:INPUT DROP [0:0]
:Inbound - [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -j Inbound
-A Inbound -p tcp -m tcp -m state --state ESTABLISHED -j ACCEPT
-A Inbound -p tcp -m tcp -d 10.96.8.96 --dport 22 -j ACCEPT
-A Inbound -p tcp -m tcp -d 10.96.8.96 --dport 25 -j ACCEPT
-A Inbound -p tcp -m tcp -d 10.96.8.96 --dport 10000 -j ACCEPT
-A Inbound -i lo -j ACCEPT
-A Inbound -p tcp -m tcp -j DROP
-A Inbound -p udp -m udp -j DROP
-A Inbound -p icmp -j DROP
COMMIT
# Generated by webmin
*mangle
:FORWARD ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
# Completed
# Generated by webmin
*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT
# Completed
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