Inconsistent login/authentication across frame relay link

[sweendog]

We have several remote sites running win95/98 with NT 4.0 domain controller at central site. When attempting to logon, receive no domain controller available message and other times users can successfully authenticate. Our routers are set up to forward any netbios broadcasts to central site and have lmhost files on client machines. <br>
Any thoughts would be appreciated.<br>
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Thanks... <br>
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[LHarvey]

I beleive you have one of 2 problems.<br><br>1) The frame relay links are being overwhelmed at some point<br>2) (outside posability) Your clients are using IPX with SAP<br><br>If #1 is the issue (assuming a IP only network) you are<br>overwhelming your frame relay CIR (comited information rate)<br>some how. Here are some possabilitys....<br>A)routing protocol (eigrp, ospf, etc) is going through <br>&nbsp;&nbsp;&nbsp;periodic update 'storms' utilizing all available<br>&nbsp;&nbsp;&nbsp;bandwidth until the routers converge (settle down)<br>&nbsp;&nbsp;&nbsp;causing short periods of blackouts for users.<br>B)You need more bandwidth on your FR links because normal<br>&nbsp;&nbsp;&nbsp;user traffic is exceeding link speeds.<br>C) You are using more than one protocol over the links.<br>&nbsp;&nbsp;&nbsp;If you run other protocols besides TCP/IP, such as IPX<br>&nbsp;&nbsp;&nbsp;and Appletalk, try to eliminate the extras and just use<br>&nbsp;&nbsp;&nbsp;TCP/IP (expecialy get rid of the appletalk!)<br>&nbsp;&nbsp;&nbsp;This will leave more available bandwidth for users.<br>D) You need to take a look at what the routers stats say<br>&nbsp;&nbsp;&nbsp;to get help determining where the bottleneck is.<br>&nbsp;&nbsp;&nbsp;Assuming you use Cisco routers, do ....<br>&nbsp;&nbsp;&nbsp;show buffers<br>&nbsp;&nbsp;&nbsp;show interfaces<br>&nbsp;&nbsp;&nbsp;show processes cpu&nbsp;&nbsp;&nbsp;(to see if cpu utiliz is high when it happens)<br>&nbsp;&nbsp;&nbsp;show ip interfaces<br>&nbsp;&nbsp;&nbsp;Look for clues in these readouts<br><br>If you use IPX on your WAN links, you can do some magic to<br>keep IPX and still cut down IPX traffic. But that is more<br>involved subject.<br><br>Leroy Harvey&nbsp;&nbsp;CCNA, CCDA, MCSE, MCNE