antonio tuozzo wrote:
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
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Ron Nutter ron_nutter@xxxxxxxxxxxxxxxxxxxxx Network Manager
Information Technology Services (502)863-7002
Georgetown College Georgetown, KY 40324-1696
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As a matter of fact DNS uses both TCP and UDP.
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