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DNS and firewall rules

Discuss DNS and firewall rules in the DNS forum on Dev Shed.
DNS and firewall rules DNS forum discussing issues, servers, and configurations. The Domain Name System (DNS) is what the Internet uses to translate website names into IP addresses.

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  #1  
Old February 23rd, 2004, 07:46 AM
poncenby poncenby is offline
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DNS and firewall rules
A bit confused about what traffic DNS uses to query.
At the moment I am allowing port 53 traffic both UDP and TCP.
Is this necessary? Am I right in thinking that DNS primarily uses UDP, and TCP allows reverse lookup?

Thanks for your time

poncenby
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  #2  
Old February 23rd, 2004, 01:00 PM
M.Hirsch M.Hirsch is offline
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TCP is afaik used for server-server transfers.
I am moving this to the DNS forum, the guys there can probably answer your question in more detail.

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Old February 23rd, 2004, 06:05 PM
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SilentRage SilentRage is offline
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No, normal dns queries AND reverse lookups use UDP. TCP is only used if a UDP packet is not large enough for the response information (which is rare) or if you have slaves that need to recieve Zone Transfers. Otherwise, TCP is optional.

If you are having firewall problems there are certain things you can do in the BIND server config that'll make sure it only uses port 53 for all transactions.
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