Hi, I honestly don't know if the old modem had an integrated router, and I have already disposed of it. What I am sure of is that I had NOT changed anything in its settings for many months, if not years, and everything was working without problems until a few weeks ago, when I posted here.
Marco Il giorno mar 27 apr 2021 alle ore 23:49 Joseph Tam <jtam.h...@gmail.com> ha scritto: > > On Mon, 26 Apr 2021, Marco Fioretti wrote: > > > 3) a few days ago I received a new modem from my ISP, as part of their > > network upgrade operations > > > > 4) more or less in the same moment the problem I reported here > > disappeared. Now mutt stays connected even 24 hours without losing > > connection. > > > > I am NOT 100% sure that the problem disappeared AFTER the change of > > modem. That happened during a few chaotic days, both work- and > > family-wise, so I did not take notes. And modems may have nothing to > > do at all with the disconnections. But now the problem is not there > > anymore, I have no clue what may have happened, and if anybody can > > guess... thanks in advance. > > Does this modem also have an integrated router? These units tend to > act as NAT gateways/firewalls that keep track of "active" sessions by > tracking external/interface NAT address mappings. Cheap or older one > could have TTL on these entries i.e. if no traffic is detected within > a time window, it is discarded, and appearing as if the endpoints had > disconnected. I guess it could also happen if the state tracking > tables has limited memory and your internal network is busy, like a family > member opening up a P2P application. > > Just a hypothesis. > > >> Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 > >> out=757 > > However, my hypothesis wouldn't produce this. This is a active > logout. > > Joseph Tam <jtam.h...@gmail.com>