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Netbios over TCP/IP Problem?

Hello

I got some problems with netbios traffic...or let me say i think it's netbios traffic but i'm not sure.

Situation:
External Nic: 62.25.44.12
Internal Nic: 192.168.0.254
DMZ Nic: 192.168.1.1
Masquerading from internal to external and internal to dmz.

Now i got a webserver in the dmz (W2k server, 192.168.1.11). I have allowed all services from the dmz to the internal and from the internal to the dmz in the packet filter. MS Clients in the internal net can map the shares of the webserver in the dmz (over ip address and over name(using hosts file)) so everything seems to work. But unfortunatly often the client loses connection to the drive. Such disconnects seems not to happen over pure TCP/IP traffic, only if it comes to NETBIOS over TCP/IP traffic (that's just a guess from me!) such disconnects seems to happen.

I see no violation or other "error" messages in in the packet filter log and i'm pretty unsure if it has something to do with Astaro or with something other.

thx for any help

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