Re: What do you consider acceptable packet / session modification for a network operator?

[Tim Burke via NANOG <nanog () lists nanog org>]

I think the general stance, at least in my opinion, is that it may be acceptable for a non-fixed broadband service 
(e.g., cell phone service), while it is not for a fixed broadband (FTTP or otherwise). I fully expect CGNAT, a basic 
level of packet mangling in an effort to maximize performance on the cell network, etc., while I am hopping between 
several different cell towers in an area along with thousands of other users, in an effort to improve the experience of 
services commonly used on a cell phone… but not so much if I am sitting in my house, connected via my own network, to a 
wired broadband connection. 

> On Dec 25, 2025, at 5:44 PM, andrew--- via NANOG <nanog () lists nanog org> wrote:
>
> So the tl;dr I'm getting from this is that 
>
> - I don't think anyone considers this 'acceptable' for an ISP
>
> - Everyone knows that AT&T does it anyway
>
> I haven't found any documentation on how or why AT&T is actually doing this, so it's all either very old or they've 
> scrubbed it from the internet (I know they deleted their whole forums, and it seems like some of the discussion was 
> formerly there)
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