[ydl-gen] iptables suddenly rejecting ping traffic
Chris St. Pierre
stpierre at NebrWesleyan.edu
Mon May 15 07:28:24 MDT 2006
Last week, I brought up iptables on my YDL 4 box with a very basic
configuration, and all was working well. This morning, at about 8 am,
it randomly started rejecting ping traffic. Restarting iptables did
not solve the problem. My iptables configuration has not changed
since Thursday afternoon. Here's my /etc/sysconfig/iptables:
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5308 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5666 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT
As you can see, this is a very basic configuration that works on many
other hosts -- and, in fact, worked on this host for a while, too.
Any ideas? Thanks!
Chris St. Pierre
Unix Systems Administrator
Nebraska Wesleyan University
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