Posted by Erwin Moller on 09/14/05 11:21

ClydeDev wrote:

> I suppose this may be a simple question, but I did a port scan on my
> Linksys router and found about 20 open UDP ports, along with the open
> TCP ports that I configured for port forwarding. My question is, how
> can these UDP ports be open to the outside world if I have not
> specificly given the router permission to forward these ports?
> Theoreticly, if I run FTP(21),SHH(22), & HTTP(80) on a server, but only
> forward port 80, that will be the only open port when doing a port
> scan... even though port 21 & 22 are open and listening on that given
> box. Now, I know my theory is based on TCP ports, and I'm asking about
> UDP ports, but I'm assuming the Linksys router/firewall should be
> blocking everything, and only allowing what I permit.
> I'd appreciate any insight into this matter, and ask that all replies
> be cc: to my personal email.
> Thank you.
>
> Frank Baris
> frank AT clydedevelopment.com

Hi Frank,

I cannot answer your question.
It could be a few things, but you better ask some expert on that matter.
A few wild ideas:
- When you request through NAP/router a random port is opened for response.
Maybe your portscan found these?
- Are you sure your router doesn't have more 'rules' than the ones you
mentioned?

Sorry to be unfriendly but you make 2 mistakes within your posting:

1) "I'd appreciate any insight into this matter, and ask that all replies be
cc: to my personal email."

I refuse to mail personally, because the whole idea of a newsgroup is
sharing questions/answers so others might benefit from that when they read
it. So if you care about the answers, come back here.


2) Why did you post to comp.lang.php?
Your question has nothing to do with PHP.
Maybe you made a mistake posting here. (No problem)
Or maybe you think PHP-people know everything. (Almost true. :P)

You might get luckier in a relevant newsgroup.

Regards,
Erwin Moller

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