Re: Firewall configurations for using DNS java as a lookup client

[Brian W. <bwe...@xb...>]

On Feb 17, 2013, at 4:47 PM, Vaibhav Bhandari <vai...@vi...> wrote:

> Sorry for a repeated questions.
> 
> Are there any best practices for how to configure firewalls to support DNS java as a lookup client (its just try to issue some DNS queries from Java primarily using TCP).
> 
> Would just opening the port 53 be sufficient?

I'm not sure that I understand the question.  Generally "opening port 53" would refer to allowing packets to come into port 53, which is certainly not required for a DNS client.  dnsjava's client will use a random port and connect outbound to port 53 for both UDP and TCP.  This usually doesn't require any firewall configuration.

Brian