If I delete one of the machines on the hypervisor then rebuild the other (forcing a rebuild of some sort) connectivity is restored:
$ ssh 10.5.0.247 "ping -c 2 10.5.2.128"
Warning: Permanently added '10.5.0.247' (ECDSA) to the list of known hosts.
PING 10.5.2.128 (10.5.2.128) 56(84) bytes of data.
64 bytes from 10.5.2.128: icmp_seq=1 ttl=64 time=0.149 ms
64 bytes from 10.5.2.128: icmp_seq=2 ttl=64 time=0.197 ms
If I delete one of the machines on the hypervisor then rebuild the other (forcing a rebuild of some sort) connectivity is restored:
$ ssh 10.5.0.247 "ping -c 2 10.5.2.128"
Warning: Permanently added '10.5.0.247' (ECDSA) to the list of known hosts.
PING 10.5.2.128 (10.5.2.128) 56(84) bytes of data.
64 bytes from 10.5.2.128: icmp_seq=1 ttl=64 time=0.149 ms
64 bytes from 10.5.2.128: icmp_seq=2 ttl=64 time=0.197 ms