I see something I should clarify directly: " I see packets going out and replies coming in - but Linux does not appear to get any traffic (RX counters not increasing)" - when I say "I see packets going out and replies coming in" that's on the switch side, not in the zLinux LPAR.
On Tue, Jan 28, 2020 at 9:40 PM Christian Svensson <[email protected]> wrote: > Hi, > > I'm operating a z114 with OSA Express 4S 1G and 10G cards. > I'm having the following issue on both zLinux (kernel 5.3.0) and z/VM 630. > When TCPIP is restarted, either in VM as "FORCE TCPIP" + "XAUTOLOG TCPIP" > (or linux as "ip link set down" followed up "up"), or a re-IPL in either > OS, the IPv6 address will not be pingable again (and no other IPv6 > traffic either). > > The things I've noted that will make the instance reply to ping again are: > > 1. Cycling the port in the switch ("shutdown" + "no shutdown")* > 2. In the VM case, pinging out through the gateway > 1. This does *not* help in zLinux oddly enough, I see packets going > out and replies coming in - but Linux does not appear to get any traffic > (RX counters not increasing) > 2. Using *another* IPv6 address on zLinux works without issue > > * However, it seems like the qeth driver in zLinux is made to forget the > IP address in case of a link-flap (which is not how conventional network > cards behave in Linux). > > I am pretty confident that it is not the switch that is acting up, I can > see the traffic counters increasing on the switch side. > The network is IPv6 only so trying with IPv4 traffic will be quite > troublesome, and replacing the switch is not really feasible as well. > First I thought it was some odd issue in my setup of zLinux, but when I > started testing z/VM and hit this similar issue I started to wonder if this > is some known issue. > > Has anyone seen similar behaviour in their environments? > > Thanks, > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
