Routing and remote access vpn site-to-site issue

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Hi all,

We need to connect to a remote office hosting a Windows 2003sp1 RRAS
in PPTP (internet provider wouldn't support L2TP) and nat all the
traffic from our network on the vpn interface. Everything works fine
using also from our side an RRAS W2003 sp1 which initiate successfully
the call to the other site.

Problems start we try to transfer (both direction) large files (30
megabytes or more) when we get a message dyplaying that the
"network name is non longer available". Other issues that we
observe are unexpected disconnection of the calling vpn interface in
our W2003 box.Iit is not a matter of idle time-out since the connection
is configured to be persistent and on the remote site there are no
forced disconnection policy profiles. Another weird thing that happens
is that the calling RRAS ato our office sometimes keeps the VPN
connection up (and is actually able to access resources in the branch
office) but it actually stops routing requests from the other clients
from the internal network.

Disconnecting and reconnecting the Dial Interface solves the problem
but as traffic increase, the problems show up again.

Same thing happens by trying an ISA 2004 solution is an edge firewall
configuration: works fine for a while and then not.

The two nics I am using in our box are not fancy ones (Realtek chipset
or so) and are of different brand and have different settings
capabilities. Can that be an issue? Are there any recommended settings
(buffer size, number of irqs and so on).

We are not talking here about routing huge amount of traffic but the
performance so far have been disappointing. I have noticed on the
remote site Event Log that when the calling vpn interface gets
disconnect this is logged as "user request" which of course is not
the case.

Any help is greatly appreciated.

Cheers,



Costantino

.

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