Hi, just a long shot perhaps, checking if anyone else have had this problem and solved it:
Two Linux servers running TSM(backup server) software, one x86 and on s390x (RHEL 6.7) Both have an extra NIC connected to a separate backup LAN, separate OSA adapters + separate cables all the way. Connection test method: telnet ipaddress 1500 Connect from s390x via that vlan and port 1500 into the x86 server works, but takes 5-10 seconds first time. And again 5-10 seconds if no traffic for about 5 minutes. Connect from x86 same method does not work, unless a connection from s390x was made the last 5 minutes. It seems the arp cache in the x86 server is updated and that server finds it way after that, but timeout is 5 minutes, so after that it does not find it's way. I took a tcpdump on that backup lan interface, got some help understanding it using wireshark, and obviously the x86 connection tries does initiate an arp query to the s390x server that also replies with its mac address, as it should. Still this does not help. Route tables also looks as expected, should not cause a problem. Anyone having seen this problem ? If you also have the solution you will make my day :-) BR /Tore ________________________________________________ Tore Agblad zOpen, IT Services Volvo Group Headquarters Corporate Process & IT SE-405 08, Gothenburg Sweden E-mail: [email protected] http://www.volvo.com/volvoit/global/en-gb/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
