Hello Jason, there is definitely no firewall rule that would block any UDP packets between the fileserver and the AFS-Client. And as you see in the output, the host does reply to whoareyou() packets ... just sometimes it doesn't which is very painful. We did some investigation in the network but tracked the problem down to the AFS-client itself. Maybe there is a lock, a semaphore or something else that must be crossed before the client sends out the answer to whoareyou(). At least this is my suspicion ...
With kind regards, Carsten Jacobi (*120-4468) Firmware Development in Böblingen IBM Deutschland Entwicklung GmbH Vorsitzender des Aufsichtsrats: Martin Jetter Geschäftsführung: Herbert Kircher Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294 Jason Edgecombe <[EMAIL PROTECTED] eek.com> To Carsten Jacobi/Germany/[EMAIL PROTECTED] 08-03-01 00:07 cc openafs-info@openafs.org Subject Re: [OpenAFS] openafs client on Linux-s390x sometimes not replying to whoareyou() calls Carsten Jacobi wrote: > Hello, > > starting from last month we have been facing "Lost contact with fileserver" > [...] > 10:30:00.945453 IP fs13.xxx.xx.xx.xx.afs3-fileserver > > mclinx.xxx.xx.xx.xx.afs3-callback: rx data cb call whoareyou (32) > 10:30:00.945499 IP mclinx.xxx.xx.xx.xx.afs3-callback > > fs13.xxx.xx.xx.xx.afs3-fileserver: rx data cb reply whoareyou (460) ^^^^^^^^^^^^^^^ > 10:30:08.941373 IP fs20.xxx.xx.xx.xx.afs3-fileserver > > mclinx.xxx.xx.xx.xx.afs3-callback: rx data cb call whoareyou (32) > 10:30:08.941455 IP mclinx.xxx.xx.xx.xx.afs3-callback > > fs20.xxx.xx.xx.xx.afs3-fileserver: rx data cb reply whoareyou (460) ^^^^^^^^^^^^^^^ > [...] > are reported "back up" again. > > My question is: What can block an AFS-Client from answering > whoareyou() for several minutes? Are there any limits or restrictions > that can lead an AFS client to a situation where it is internally blocked? > Are there parameters one can adjust for tuning in order to avoid this > situation? > We have had those "Lost contact" time slots once every two days > lately and they are painful for users who are logged on our system > during that time. I would be happy to get rid of them somehow ... > This may be a silly question, but are there any firewalls or NAT running on the fileserver, client, or in between? If the firewall blocks the who are you message, then that would explain why there is no reply. Sincerely, Jason :�� T���&j)b� b�өzpJ)ߢ�^��좸!��l��b��(���~�+����Y���b�ا~�����~ȧ~