pptp server fails to answer after win98 connection

[scott]

Hi,

Did a really interesting test this morning. Please read from start to finish
to get a idea of the problem as i aint that articulate:

(My setup involves 2ksp3 server behind firewall and 2 external connecting
clinets, one on 2k other on 98).

From external IP 1 a windows 2000 machine connnected.
From external IP 1 a windows 2000 machine disconnected.
From external IP 1 a windows 2000 machine connnected.
From external IP 1 a windows 2000 machine disconneted.

Seemed to be working fine.

From external IP 1 a windows 2000 machine connnected.
From external IP 2 a windows 98 machine could not connect.
From external IP 1 a windows 2000 machine manually disconnected.
From external IP 2 a windows 98 machine could connected.
From external IP 1 a windows 2000 machine could not connect.
From INTERNAL LAN an XP clinet could connect then manually disconnected.

Seemed to suggest only 1 machine could connect from external source. 10 mini
wan ports are avaialble on ras server.
(NOTE: I will try multi 2000 and XP machines soon).

From external IP 2 a windows 98 machine manually disconnected.
From external IP 2 a windows 98 machine could not connect.
From external IP 1 a windows 2000 machine could not connect.

SO WINDOWS 2000 machines can connect on and off (and probably MANY 2000
machines).

HOWEVER, as soon as window 98 connnects any other connections stops working
for a day.

Does this mean that all PPTP GRE traffic is going to a single WIN98
connected PPTP clinet. Hence when a second machine tries to connect it does
not get a reply ?

Any idea how to solve this ?

Thanks
Scott.

 

[scott]

Got a better test:

NET
v
ROUTER
v
ROUTER > win2k clinet (WS012)
v
FIREWALL
v
RAS SERVER

- The win2k clinet (WS012) on the middle router (DMZ) can ALWAYS establish a
PPTP connection to RAS SERVER.
- This connection passes through the FIREWALL.
- Once this connection has been made all other external PPTP WIN2k clients
can connect.
- After WS012 disconnects and after several mins all external WIN2k that
attempt connection get error 721.

What the heck is going on ?

Thanks for any information at all.
Scott.

 

[scott]

futher testing showed:

win98 on external ip connect ok (firewall report PPTP 1723 + GRE)

win 98 manually disconet, reconnect (frewall report PPTP 1723 only)

Its like GRE was lost during the second connection. IE second time GRE did
not make it as far as the FIREWALL.

Im checking middle ROUTER.