Re: Cingular Port Blocking on EDGE Network?

[POSTED TO alt.cellular.cingular - REPLY ON USENET PLEASE]

In <dgkjum$a8o$1@xxxxxxxxxxxxxx> on Sun, 18 Sep 2005 20:50:30 +0000 (UTC),
dold@xxxxxxxxxxxxxxxxxxxxxxxx wrote:

>John Navas <spamfilter0@xxxxxxxxxxxxxx> wrote:

>> Port forwarding is necessary only over NAT/PAT, as in the case of a home
>> networking "router" -- standard network routers pass all unblocked traffic.
>> Hence this wouldn't be an issue for cellular.
>
>I presumed that Cingular was providing a NAT address. I thought I saw my
>ipconfig address as being different from the address reported by
>dslreports. I might be mistaken.
>
>Some hotspots that I have visited have given 192. addresses, and I have
>presumed those to be NAT as well.

That Cingular is assigning private IP addresses doesn't necessarily mean that
PAT (Port Address Translation) is being used -- with one-to-one mapping there
would be no sharing of the public IP address, and thus no port translation (or
special forwarding) would be needed.

>The only inbound connection that I tried to my tethered PC was iperf, and
>that didn't connect. I didn't try anything other than the default port.

I've now done some testing, and inbound connections won't work, so it seems
that Cingular is indeed using NAT/PAT rather than one-to-one mapping. My
apologies for my erroneous statement (in the top quote above).

--
Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular>
.

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