[SOLVED] Lost network after lenny-to-squeeze upgrade

[Itay <debian@itayf.fastmail.fm>]

On Sat, 14 May 2011, Itay wrote:

> I am experiencing major network problems after the upgrade.
> Rebooting solves the problem for a short while - after 5
> minutes, or so, network will be lost.
>
> Based on searches in the internet I pasted below some info that
> I understand might help to resolve the problem.
>
> Please help.
> Thanks,
> Itay


So I purged NetworkManager; network works fine.
Tested after several reboots and system updates.

Thanks to Camaleón and Shell Xu for advice and detailed explanations.
See thread for details.

Itay