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From another system on the network you should be able to ping both. However, looking at the ARP traffic with tcpdump you'll see that once again the physical address associated with each VE will be subject to ARP flux, drifting between all three IP addresses over time.
<pre>
00:0c:29:d2:c7:aa > ff:ff:ff:ff:ff:ff, ARP, length 60: arp who-has 192.168.18.101 tell 192.168.18.129
00:0c:29:b3:a2:54 > 00:0c:29:d2:c7:aa, ARP, length 60: arp reply 192.168.18.101 is-at 00:0c:29:b3:a2:54
00:0c:29:b3:a2:68 > 00:0c:29:d2:c7:aa, ARP, length 60: arp reply 192.168.18.101 is-at 00:0c:29:b3:a2:68
00:0c:29:b3:a2:5e > 00:0c:29:d2:c7:aa, ARP, length 60: arp reply 192.168.18.101 is-at 00:0c:29:b3:a2:5e
00:0c:29:d2:c7:aa > 00:0c:29:b3:a2:54, IPv4, length 98: 192.168.18.129 > 192.168.18.101: ICMP echo request, id 43311, seq 1, length 64
00:0c:29:b3:a2:54 > 00:0c:29:d2:c7:aa, IPv4, length 98: 192.168.18.101 > 192.168.18.129: ICMP echo reply, id 43311, seq 1, length 64
00:0c:29:d2:c7:aa > 00:0c:29:b3:a2:54, IPv4, length 98: 192.168.18.129 > 192.168.18.101: ICMP echo request, id 43311, seq 2, length 64
00:0c:29:b3:a2:54 > 00:0c:29:d2:c7:aa, IPv4, length 98: 192.168.18.101 > 192.168.18.129: ICMP echo reply, id 43311, seq 2, length 64
00:0c:29:b3:a2:54 > 00:0c:29:d2:c7:aa, ARP, length 60: arp who-has 192.168.18.129 tell 192.168.18.10
00:0c:29:d2:c7:aa > 00:0c:29:b3:a2:54, ARP, length 60: arp reply 192.168.18.129 is-at 00:0c:29:d2:c7:aa
</pre>
The reasons for this can be found from executing the following command on the HN.
