[unisog] anyone else seeing lots of popup spam/malware?

John Kristoff jtk at northwestern.edu
Fri Oct 28 02:55:02 GMT 2005

On Wed, 26 Oct 2005 09:59:59 -0700
Karyn Williams <karyn at calarts.edu> wrote:

> There will not be any legit traffic sourced or destined with a port of
> 0 either UDP or TCP. It is offically a reserved port. A source port
> from a client should be in the range of 1025-65535. 
> The range for assigned ports managed by the IANA is 0-1023.

There are a few pieces of incorrect information here.  As I noted in a
previous post, UDP source port 0 is perfectly legitimate.  Secondly,
"client" is a vague concept, but in the historic context that you're
using, you have to include 1024 as well.  Lastly, IANA manages all port
numbers, that is why they are called the Internet Assigned Numbers
Authority.  :-)


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