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why does dail-up or pppoe access always has session-timeout ?

It also probably has something to do with oversubscription. Providers
generally allocated trunks (most dial up providers I knew used Livingston
Port Masters), however their subscriber base was much larger than the
number of phone lines available to take incoming calls. If you time out
idle users, you have more phone lines available to take calls. Even in the
BBS days, we still had to wait our turn.. Usually it was a redial until we
got a carrier.

I'll agree with the configuration aspect, but I really think it has much
more to do with resource allocation in a telco environment (n:1 oversub).


On 5/30/13 10:37 AM, "Valdis.Kletnieks at vt.edu" <Valdis.Kletnieks at vt.edu>

>On Thu, 30 May 2013 09:10:21 -0000, Joe said:
>>   a question  obsessed me for a long time.  "why my  pppoe connection to
>> internet has a max session time, even if every thing goes ok? "
>From a provider's point of view, forcing a connection to re-establish
>every few days means that if you ever have to roll out a change, you
>don't end
>up with *That* *One* *User* who stays connected for weeks or even months
>the old parameters.