Does anyone know if packet fragmentation on your iSeries network can cause appearance/manifestation of the problem of unexplained random dropped 5250 sessions? Symptom: My 5250 interactive session is left active as if nothing happened (I am sure you have experienced this) the 5250 client gets a new signon screen. Other concurrent 5250 sessions between same source and destination IP's are still running fine. I have tried several 5250 clients, more than one iSeries and release level and keep alive adjustments. I have read through the midrange archives, reading most suggestions and individual solutions/fixes. As a test, I lowered a PC 5250 client NIC MTU to a level where packets are no longer fragmented from the effected iSeries network. The problem seems to be masked now. This problem does not seem to happen on other iSeries networks I have recently telneted to, which means my issue is local to an iSeries network LAN path to the WAN, and not me, a particular iSeries or the WAN/internet. With that said, does anyone have a suggestion on 1) Is this is a correct determination/likely cause for random 5250 dropped sessions 2) what are the typical reasons for high packet fragmentation on a LAN? old/failing piece of hardware? ISP? something configured wrong? bad nic? bad wiring? As always, THANKS! Mark Villa in Summerville SC
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