J'ai remarqué un truc rigolo en IPv6 sur un réseau Ethernet:
nico@Gallifrey:~$ ip -6 addr show wlan0
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:470:ca7c:1:ea39:dfff:fe10:efbd/64 scope global dynamic
valid_lft 86396sec preferred_lft 14396sec
inet6 fe80::ea39:dfff:fe10:efbd/64 scope link
valid_lft forever preferred_lft forever
nico@Gallifrey:~$ ping6 -c 2 2001:0470:ca7c:0001::1
PING 2001:0470:ca7c:0001::1(2001:470:ca7c:1::1) 56 data bytes
64 bytes from 2001:470:ca7c:1::1: icmp_seq=1 ttl=255 time=1.67 ms
64 bytes from 2001:470:ca7c:1::1: icmp_seq=2 ttl=255 time=1.73 ms
--- 2001:0470:ca7c:0001::1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 1.670/1.700/1.731/0.051 ms
nico@Gallifrey:~$ ping6 -c 2 2001:0470:ca7c:0001::
PING 2001:0470:ca7c:0001::(2001:470:ca7c:1::) 56 data bytes
64 bytes from 2001:470:ca7c:1::1: icmp_seq=1 ttl=255 time=2.01 ms
64 bytes from 2001:470:ca7c:1::1: icmp_seq=2 ttl=255 time=1.71 ms
--- 2001:0470:ca7c:0001:: ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 1.712/1.862/2.012/0.150 ms
Cela ne marche pas dés qu'on traverse un routeur par contre.