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Old 03-14-2005, 03:43 PM   #1
Registered: Sep 2003
Distribution: LFS6.1, FC3, RH9
Posts: 36

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how to open up firewall for DNS?

I have a FC3 server that will be a webserver and DNS server for the domain. How do I open up the firewall for DNS requests from the outside world?

I see that the default firewall setup allready accepts "multicast DNS" (whatever that is) packets on port 5353, but that alone is not working. (I am testing DNS from a remote windows machine using nslookup.)

Using the system-config-securitylevel tool, I tried adding "domain:udp" to the "other ports" line. But this made the tool hang after exiting. (And cleared all the rules after I ctrl-z'ed.)

Do I have to edit the iptables file to accept DNS requests on port 53?

- Joe

Last edited by jdupre; 03-14-2005 at 03:49 PM.
Old 03-15-2005, 08:18 AM   #2
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Registered: May 2003
Location: istanbul
Distribution: debian - redhat - others
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run the followings:
iptables -I INPUT -p udp --dport 53 -j ACCEPT
/etc/init.d/iptables save

it will surely open udp 53 port. and it will save the current rules in your iptables srore file.

good luck.


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