Xref: utzoo comp.protocols.tcp-ip:7490 comp.protocols.tcp-ip.ibmpc:1418 comp.protocols.pcnet:2 Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!agate!violet.berkeley.edu!gts From: gts@violet.berkeley.edu (Greg Small) Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.ibmpc,comp.protocols.pcnet Subject: PCLAN/NetBIOS/TCP problem Message-ID: <25723@agate.BERKELEY.EDU> Date: 23 Jun 89 22:22:36 GMT Sender: usenet@agate.BERKELEY.EDU Reply-To: gts@violet.berkeley.edu (Greg Small) Organization: University of California, Berkeley Lines: 31 = Article 26 of comp.protocols.pcnet: Date: 19 Jun 89 21:16:56 GMT = From: tony@scotty.dccs.upenn.edu (Anthony Olejnik) = = I'm having a problem with IBM's PCLAN program. When using either Ungermann- = Bass PCNIUs (with Release 16.0 of TCPPC) or WD8003E's (with PC/TCP v2.03 pl = 1) the PCLAN server does not drop non-existent sessions. = = Clients who connect to the server are still "seen" by the server even after = the PC is turned off. This presents a problem the next day when the same = clients attempt to connect to the server again. If the server has available = NETBIOS/TCP sessions, then the client is able to re-connect. However, this = still leaves a non-existent session on the server end. The temporary solution for UB TCP-PC 16.0 is to turn on TCP Heartbeats. This allows the server to time-out the connection. RFC1001/1002 also provides a separate heartbeat for Netbios sessions only but that is not implemented in 16.0 (comming in 16.1?). You should check PC/TCP for a similar option. There is a similar problem that PC Net/LAN does not clean up a Netbios connection if the workstation IP address is changed while the server has a Netbios connection open. When the workstation logs back into the server the connection under the old IP address is maintained. I guess from your question that the UB TCPPC 16.0 and the PC/TCP interoperate OK under RFC1001/1002? Gregory T Small (415)642-5979 Personal Computer Networking & Communications gts@violet.Berkeley.EDU Workstation Support Services - Software Group ucbvax!jade!gts 267 Evans Hall SPGGTS@UCBCMSA.BITNET University of California, Berkeley, Ca 94720