iptables slows down access to httpd server

[John Summerfield]

Steve Lindemann wrote:
> This, strictly speaking, isn't a Fedora problem, but I'm hoping someone 
> out there can help.
> 
> system config:
> dell poweredge 2950
> kernel: 2.6.22.9-61.fc6
> apache: 2.2.6
> 
> problem summary:  when iptables is turned on, web pages (graphics in 
> particular) served up from the box are *extremely* slow to load, 
> sometimes timing out.  when iptables is turned off, web pages served up 
> from the box load normally.  I've compared my /etc/sysconfig/iptables 
> file to another (fc6) server and they are effectively the same, *but* 
> I've never had a problem with page loads from the other box.
> 
> I'm assuming (yes, I know 8^) that the problem lies with iptables, but 
> I'm running out of places to look for answers.  Should I be looking 
> somewhere other than the firewall?  Has anyone else seen this?  I'd 
> really appreciate any help anyone out there could give.
> 
> ((beware of line wrapping))
> # Firewall configuration written by system-config-securitylevel
> # Manual customization of this file is not recommended.
> *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 -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
> -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
> -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -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 80 -j 
> ACCEPT
> -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j 
> ACCEPT
> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> COMMIT
> 
> ...ok I did manually edit the file to add the http rule, but up until 
> now I've not had any problems doing that sort of thing.  Iptables does 
> drive me just a bit crazy, but I do know enough to to that successfully 
> (up until now that is).  Help!  ...and thanks!

Do you need to open domain?

-- 

Cheers
John

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