[e2e] tcp connection timeout

Saikat Guha saikat at cs.cornell.edu
Wed Mar 1 04:27:41 PST 2006

On Tue, 2006-02-28 at 23:53 -0600, Brahim Ben wrote:
> Some implementations of TCP implement a timer called Keepalive timer,

The default operation of the keepalive timer depends on the OS. Linux
and Windows don't send keepalives by default, as far as I recall; when
enabled, the recommended default value is around 2 hours.

Also, some NAT/firewalls will timeout idle connections long before that
(usually 1h, sometimes as low as 15m, or as high as 5d). Depending on
the host OS, an idle connection abandoned by a NAT/firewall can show up
as a timeout error.

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