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- Path: sparky!uunet!mcsun!Germany.EU.net!materna!tb
- From: tb@Materna.DE (Torsten Beyer)
- Newsgroups: comp.protocols.tcp-ip
- Subject: TCP/IP over ISDN
- Message-ID: <tb.714899933@materna>
- Date: 27 Aug 92 07:18:53 GMT
- Sender: root@maternaMaterna.DE
- Lines: 23
-
- Hi Folks,
-
- I have a problem concerning TCP/IP over ISDN. We have an ISDN implementation
- for TCP/IP that is able of a so called short hold mode. This means, ISDN
- connections that are idle for a certain time get closed without closing the
- overlaying TCP connections. As soon as one of the communication partners
- starts sending data again, a new ISDN connection is established. All this
- happens (nearly) transparently to the IP layer.
-
- However there is a problem: How can a server tell wether an established
- connection is still established or already broken due to a crash on the
- client side. We don't want to poll clients (i.e. ping) since this would
- actually break the cost advantage of ISDN short hold mode.
-
- From my point of view the only way a server can tell a connection is
- broken, is when the same client sends a SYN from the same client port to the
- same server port. Is this true or are there other ways of detecting that a
- connection is broken (or was broken) ?
- --
- Torsten Beyer mail : tb@Materna.DE
- Dr. Materna GmbH vox humana : +49 231 5599 225
- Vosskuhle 37, D-4600 Dortmund fax machina : +49 231 5599 100
- "There must be a place, under the sun, where hearts of olden glory grow young"
-