Re: [72attendees] In-room network

Something that I did not mention that is relevant is that I was using  
AIM from the room Sunday night.

So, something changed over 24 hours.

Regards
Marshall

On Jul 29, 2008, at 7:29 AM, Jeffrey Hutzelman wrote:

> --On Monday, July 28, 2008 08:14:03 PM -0400 Marshall Eubanks <tme@multicasttech.com 
> > wrote:
>
>> Tonight from my room, I get connection failures for AIM, but  
>> jabber, ssh,
>> http, etc., all work fine. It sounds like port blockage to me.
>
> Really?  Have you collected any data that shows that your packets  
> are not getting through?  Or are you simply assuming that if it  
> doesn't work, it must be because the port is blocked?
>
> Someone noted earlier that the hotel's NAT seems to be allocating a  
> different outside IP address for each outgoing "connection" (which,  
> for UDP, often means each packet).  There are certainly a lot of UDP- 
> based protocols that that will break, if it's true (I'm not entirely  
> convinced, because I run things that it _should_ break pretty badly  
> but that seem to work fine).
>
> FWIW, I've also noticed AIM breaking from behind other NAT's lately,  
> which may indicate the protocol is NAT-unfriendly in some way.  That  
> would be news to me, but then, it's not a protocol I use often, and  
> I avoid NAT's when I can.
>
> Of course, it's also possible that some people's VPN connections are  
> breaking because they expect to use a particular port, either for  
> tunneled traffic or for IKE, or because they expect to use a  
> protocol for which the NAT cannot multiplex multiple connections.   
> Those of us who've done this a few times presumably know about these  
> pitfalls by now, but there will always be someone who's never  
> encountered the problem before.
>
>
> I would suggest that if folks are having problems getting particular  
> protocols to work, that they collect as much data as possible about  
> what is going on and then report the problem to the hotel.  Maybe  
> one of the NOC folks can give us an idea of what sorts of data are  
> most useful.
>
> -- Jeff

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