Typical additional latency for CGN?

Jon Lewis jlewis at lewis.org
Wed Oct 10 13:25:12 UTC 2012


I just spent a few minutes looking into this again, and figured out the 
problem.  AT&T has apparently changed the way their CGN works.  I use a 
form of port knocking to restrict access to SSHd from "foreign" networks. 
It used to work fine from my phone.  Now, the port knocking request from 
the phone and the ssh connection are being NAT'd to different public IPs, 
so my system is allowing ssh access to one AT&T IP, and then the ssh 
connection comes from a nearby but different IP.

On Wed, 10 Oct 2012, Owen DeLong wrote:

> The day before I left the US, it was still working on my iPad.
>
> Owen
>
> On Oct 8, 2012, at 5:20 AM, Jon Sands <fohdeesha at gmail.com> wrote:
>
>> On 10/7/2012 9:22 PM, Jon Lewis wrote:
>>> has anyone else noticed AT&T mobile is blocking ssh (outgoing 22/tcp) connections?
>>
>> Not here, have an SSH session open on my phone on port 22 as we speak. I'm on an android on ATT's 3G network in central indiana, if that matters.
>>
>> --
>> Jon Sands
>> Fohdeesha Media
>> http://fohdeesha.com/
>>
>
>
>

----------------------------------------------------------------------
  Jon Lewis, MCP :)           |  I route
  Senior Network Engineer     |  therefore you are
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