Underlay loose the first ARP request to resolv an IP

[Édouard Thuleau]

If an hypervisor (a node with vrouter's vhost interface) tries to resolve an IP, the first ARP request is not consider (drop? no increasing in 'dropstats' command)

$ ping -c 3 10.10.0.46
PING 10.10.0.46 (10.10.0.46) 56(84) bytes of data.
64 bytes from 10.10.0.46: icmp_req=2 ttl=64 time=0.438 ms
64 bytes from 10.10.0.46: icmp_req=3 ttl=64 time=0.379 ms

--- 10.10.0.46 ping statistics ---
3 packets transmitted, 2 received, 33% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.379/0.408/0.438/0.035 ms

$ sudo tcpdump -eni vhost0 arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on vhost0, link-type EN10MB (Ethernet), capture size 65535 bytes
13:30:22.567862 52:54:00:1c:d2:86 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Request who-has 10.10.0.46 tell 10.10.1.55, length 28
13:30:22.569502 52:54:00:bf:56:c6 > 52:54:00:1c:d2:86, ethertype ARP (0x0806), length 56: Reply 10.10.0.46 is-at 52:54:00:bf:56:c6, length 42
13:30:26.840409 52:54:00:10:e6:e6 > 52:54:00:1c:d2:86, ethertype ARP (0x0806), length 56: Reply 10.10.1.71 is-at 52:54:00:10:e6:e6, length 42

[Anand H. Krishnan (anandhk)]

Commit id

6572df6694a00efd62a341112772499bb5aa43c4