IP Tables problem

[antonio tuozzo]

dns uses udp protocol

:)

On Wed, Oct 20, 2004 at 08:56:34AM -0400, Ronald I. Nutter wrote:
> I am setting up a RHEL 3 box to take the place of one of our DNS
> servers.  Everything works ok until I bring up Iptables.  I used
> redhat-config-securitylevel to setup the rules.  Here is what I am
> currently using -
> 
> # Firewall configuration written by redhat-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 -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 53 -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
> 
> I can SSH and do DNS lookups against the server without the rules in
> place.  With the rules in place, I can only SSH to the server.  NSLOOKUP
> starts reporting DNS timeouts.  This is a single nic system.  I am new
> to iptables, so I had hoped this would get things running easier than my
> trying to piece things together.
> 
> Suggestions ?
> 
> Ron
> --------------------------------------------------------------------
> Ron Nutter                          ron_nutter at georgetowncollege.edu 
> Network Manager
> Information Technology Services                        (502)863-7002
> Georgetown College                                     
> Georgetown, KY                                            40324-1696
> --------------------------------------------------------------------
>  
> 
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