On Wednesday, 03/30/2005 at 08:26 MST, Dave Myers <[EMAIL PROTECTED]> wrote: > We have setup two VM's (4.4 & 5.1) with numerous Linux guests (SLES8 + > SP3) > using VNICs on VSWITCH. > > Some of the linux servers are not responding to PINGs, some are. > > This is a z990 with OSA/E GB. > > We've applied all PTFs to the VMs that are VSWITCH related. > > We've made sure to make the MAC ADDR PREFIX different for the one VM > system. > > For the failing servers, we can logon to those servers (via VM) and login > into linux > and successfully ping outbound. > > This appears to be OSA related...any known problems in that area? > I did a NETSTAT ARP nn.nnn.nn.nn for one of the failing servers, > and it DID have an ARP entry for it.
Divide and conquer. 1. Put a sniffer on the OSA and see if the ICMP ECHO REQUEST and RESPONSE packets are moving in and out of the adapter. 2. Work with the Support Center to get a VSWITCH OSA adapter data trace. 3. Use tcpdump on Linux With all 3 active at the same time, you will know whether the problem is in the OSA, CP, Linux, or elsewhere in your network. The ability to ping outbound would traditionally indicate that someone's ARP cache is timing out and is having trouble being refreshed. Scenario: You ping outbound first, then you can ping inbound as long as you don't stop pinging. If you stop for, say, 5 minutes, then you can no longer ping inbound. Alan Altmark z/VM Development IBM Endicott ---------------------------------------------------------------------- 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
