We experiment with peer_notify_delay. On H1, run:
ip link set down dev eth0
ip link set up dev eth0
On H2, you should noticed with tcpdump:
tcpdump -pni eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
18:36:06.792651 IP6 fe80::5254:33ff:fe00:3 > ff02::2: ICMP6, router solicitation, length 16
18:36:09.099460 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:09.099475 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
18:36:09.202912 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:09.202925 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
18:36:09.722939 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:09.722954 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
18:36:10.242825 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:10.242838 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
18:36:10.762699 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:10.762707 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
18:36:11.282886 ARP, Request who-has 203.0.113.10 tell 203.0.113.10, length 28
18:36:11.282899 IP6 fe80::5254:33ff:fe00:1 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::5254:33ff:fe00:1, length 32
See http://patchwork.ozlabs.org/patch/1124972/ for the patch adding
peer_notif_delay.