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NAT timeout
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Conor Turton
Dec 28, 2001, 6:53:27 PM12/28/01
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In article <khgp2ukgjtojr8t09...@4ax.com>, ?@?.? says...
> Hi
>
> I'm really looking for some help configuring a 3Com OfficeConnect ISDN
> Router (model 511, but most things also apply to the 521 and 531). I
> know that a number of people who use Demon for ISDN access have one of
> these.
>
> I have configured the router without any problems, enabling NAT for
> the PCs that I run on my local network since my ISP (BTConnect) only
> supplies me with one dynamic IP address. I've also enabled PAT (port
> forwarding) and that works fine too.
>
> What I am having trouble with is TCP and UDP session timeouts (these
> options are under the NAT menu of the router). I have the latest
> firmware for the router too - the router was discontinued some time
> ago by 3Com.
>
> My scenario involces the use of ICQ on the PCs on my LAN. Since
> BTConnect disconnects from the Internet at irregular intervals, the
> ISDN router will automatically reconnect. Since BTConnect offer
> dynamic IP addresses, the new connection will have a different IP from
> the previous connection.
>
> The workstations on the LAN are unaware that the external IP address
> has changed because they aren't doing the diallling - the router is.
> So when a user, who has ICQ loaded, tries to send a message after a
> reconnection to BTConnect has occured on the router, they cannot do
> it. ICQ has to be taken offline and then put back online again so it
> registers the change of external IP. If anyone who is listed as
> offline on that users ICQ panel comes online between the time the
> router reconnected to BTConnect and the time the user decided to
> reload ICQ, their status on ICQ would still be registered as offline.
> I believe that the user on the LAN would also appear as offline on the
> ICQ panel of anyone who has come online since the dynamic IP of the
> user on the LAN has changed.
>
> Am I making sense here? ;)
> Hi
>
> I'm really looking for some help configuring a 3Com OfficeConnect ISDN
> Router (model 511, but most things also apply to the 521 and 531). I
> know that a number of people who use Demon for ISDN access have one of
> these.
>
> I have configured the router without any problems, enabling NAT for
> the PCs that I run on my local network since my ISP (BTConnect) only
> supplies me with one dynamic IP address. I've also enabled PAT (port
> forwarding) and that works fine too.
>
> What I am having trouble with is TCP and UDP session timeouts (these
> options are under the NAT menu of the router). I have the latest
> firmware for the router too - the router was discontinued some time
> ago by 3Com.
>
> My scenario involces the use of ICQ on the PCs on my LAN. Since
> BTConnect disconnects from the Internet at irregular intervals, the
> ISDN router will automatically reconnect. Since BTConnect offer
> dynamic IP addresses, the new connection will have a different IP from
> the previous connection.
>
> The workstations on the LAN are unaware that the external IP address
> has changed because they aren't doing the diallling - the router is.
> So when a user, who has ICQ loaded, tries to send a message after a
> reconnection to BTConnect has occured on the router, they cannot do
> it. ICQ has to be taken offline and then put back online again so it
> registers the change of external IP. If anyone who is listed as
> offline on that users ICQ panel comes online between the time the
> router reconnected to BTConnect and the time the user decided to
> reload ICQ, their status on ICQ would still be registered as offline.
> I believe that the user on the LAN would also appear as offline on the
> ICQ panel of anyone who has come online since the dynamic IP of the
> user on the LAN has changed.
>
> Am I making sense here? ;)
Perfect sense. The problem isn't the LAN but rather a limit of the
software. ICQ does not detect IP address changes even if you select the
Connection option of being behind a firewall as in the U.S most
firewalled computers are on fixed IP addresses so its not an issue ICQ
have ever addressed. I leave mine on "Modem" connection instead of
Permanent/Lan so therefore when it hopefully detects no connection to
the ICQ server it drops out and goes offline itself.
--
_________________________
Conor Turton
conor_...@hotmail.com
ICQ:31909763
_________________________
Ben Newsam
Dec 29, 2001, 8:54:28 AM12/29/01
to
Conor Turton wrote the following, despite his/her Organization header
saying "":
>Perfect sense. The problem isn't the LAN but rather a limit of the
>software. ICQ does not detect IP address changes even if you select the
>Connection option of being behind a firewall as in the U.S most
>firewalled computers are on fixed IP addresses so its not an issue ICQ
>have ever addressed. I leave mine on "Modem" connection instead of
>Permanent/Lan so therefore when it hopefully detects no connection to
>the ICQ server it drops out and goes offline itself.
saying "":
>Perfect sense. The problem isn't the LAN but rather a limit of the
>software. ICQ does not detect IP address changes even if you select the
>Connection option of being behind a firewall as in the U.S most
>firewalled computers are on fixed IP addresses so its not an issue ICQ
>have ever addressed. I leave mine on "Modem" connection instead of
>Permanent/Lan so therefore when it hopefully detects no connection to
>the ICQ server it drops out and goes offline itself.
This seems to be a problem with some games and other software that wants
to allow two machines to interact. Can anyone give chapter and verse on
this?
--
Ben
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