Cross-posted to IBMVM and LINUX390 lists
Greetings.
We're bringing up z/VM and Linux guests for the first time at a D/R exercise.
Since we have our own CBU "warm site", we create an isolated network to be used
for the D/R exercise. The primary internal network is prefixed 10.1 and the
isolated D/R network is prefixed 10.2.
After z/VM (6.2, non-SSI) IPLs, we logon TCPMAINT and edit PROFILE TCPIP to
change the HOME and DEFAULTNET IP addresses from 10.1.xxx.yyy to 10.2.xxx.yyy,
then shut down and restart TCPIP. z/VM is now reachable from non-mainframe
devices plugged into the isolated network (e.g., Ping from a laptop works fine;
3270 emulator sessions establish via non-ICC ports).
Next we login to a Linux (RHEL 6.3 and 6.5) guest (3270 console), where we had
pre-configured a "clone" of the ifcfg-eth0 file to specify 10.2 (instead of
10.1) in all the appropriate places. We rename ("mv") the "prod" and "D/R"
copies so that ifcfg-eth0 now specifies 10.2 instead of 10.1 in all the right
places. We stop and restart network services, but Linux is not ping-able from
outside. OK let's reboot Linux. No change; still can't ping Linux from
outside the mainframe but within the isolated network. OK, we'll just bounce
the whole virtual machine (SIGNAL SHUTDOWN followed by XAUTOLOG from OPERATOR).
That didn't work, either. We didn't notice any network-related error message
as Linux came up again.
Not much to go on, but can anybody think of what we might have missed in
reconfiguring Linux to "play" in the isolated (10.2) network?
TIA,
-jc-
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