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2002 Jan 03 20:38

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

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Re: [vox-tech] firewall question
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Re: [vox-tech] firewall question



On Thu, Jan 03, 2002 at 04:17:02PM -0800, Shwaine wrote:
> There is no need for UDP 22 and 80 to do normal web browsing and 
> SSH sessions. The only UDP packets I allow on the input side of the 
> firewall is UDP port 53 from only my ISP's DNS servers, since these 
> are the replies to my DNS queries. I've read in a few documents that 
> DNS may also sometimes use TCP port 53. I haven't seen that happen 
> in any of my logs however. Anyways, you should be fine blocking those 
> two UDP ports. My web browsing and SSH use go just fine with them 
> blocked.

Generally DNS only uses 53/tcp when running a zone transfer.

-- 
Henry House
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