My desktop Linux machine runs Pop!_OS 22.04, an Ubuntu variant. After trying to coerce it into a shape that would let the ZD&TLE license software run successfully, I gave up and installed a KVM virtual machine with vanilla Ubuntu Server 20.04. On that, I can pass through the USB token direct to the VM, and the ZD&T package comes up and IPLs z/OS 2.4 just fine. Unfortunately, I cannot get networking to the z/OS system to work.
I'm trying to have all three systems - the host machine, the Ubuntu VM, and the z/OS system - appear no my network in the same subnet. The host machine is at 192.168.120.2, the VM is at 192.168.120.44, and the z/OS system is at 192.168.120.101. I have bridged networking set up in the VM and on the host as well. It almost works. z/OS brings up the network adapter and can talk to the DNS server at 192.168.120.1. Anything more than that from the rest of the network back to the z/OS host, though, blows up with a complaint the host is not reachable.
The really weird thing is what happens when I ping the z/OS system from either the physical host or elsewhere on the network: 192.168.120.101 replies just fine, but 192.168.120.44 *also* replies:
(2014) jmaynard@dot:~$ ping 192.168.120.101
PING 192.168.120.101 (192.168.120.101) 56(84) bytes of data.
64 bytes from 192.168.120.101: icmp_seq=1 ttl=64 time=0.943 ms
64 bytes from 192.168.120.101: icmp_seq=2 ttl=64 time=1.10 ms
64 bytes from 192.168.120.101: icmp_seq=3 ttl=64 time=1.73 ms
64 bytes from 192.168.120.101: icmp_seq=4 ttl=64 time=1.51 ms
From 192.168.120.44 icmp_seq=1 Destination Host Unreachable
From 192.168.120.44 icmp_seq=2 Destination Host Unreachable
64 bytes from 192.168.120.101: icmp_seq=5 ttl=64 time=0.892 ms
64 bytes from 192.168.120.101: icmp_seq=6 ttl=64 time=0.786 ms
64 bytes from 192.168.120.101: icmp_seq=7 ttl=64 time=2.02 ms
From 192.168.120.44 icmp_seq=5 Destination Host Unreachable
64 bytes from 192.168.120.101: icmp_seq=8 ttl=64 time=0.674 ms
64 bytes from 192.168.120.101: icmp_seq=9 ttl=64 time=1.73 ms
64 bytes from 192.168.120.101: icmp_seq=10 ttl=64 time=0.721 ms
^C
--- 192.168.120.101 ping statistics ---
10 packets transmitted, 10 received, +3 errors, 0% packet loss, time 9100ms
rtt min/avg/max/mdev = 0.674/1.210/2.018/0.466 ms, pipe 4
What do I need to do to get the VM to shut up and ignore traffic for z/OS, letting it flow through the bridge to the z/OS network adapter?
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Jay Maynard
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