ifconfig lo1 down

[fredrik danerklint]

Hi,

I would like to know what is the differents between ip4 and ip6 for this 
command.

First:

#ifconfig lo1   
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet xx.xx.xx.2 netmask 0xffffffff 
        inet6 2a03:xxxx:xxxx::xxxx:xx02 prefixlen 128 
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>

$ ping xx.xx.xx.2
PING xx.xx.xx.2 (xx.xx.xx.2): 56 data bytes
64 bytes from xx.xx.xx.2: icmp_seq=0 ttl=64 time=0.012 ms
64 bytes from xx.xx.xx.2: icmp_seq=1 ttl=64 time=0.010 ms
^C

and

$ ping6 2a03:xxxx:xxxx::xxxx:xx02
PING6(56=40+8+8 bytes) 2a03:xxxx:xxxx::xxxx:xx02 --> 2a03:xxxx:xxxx::xxxx:xx02
16 bytes from 2a03:xxxx:xxxx::xxxx:xx02, icmp_seq=0 hlim=64 time=0.053 ms
16 bytes from 2a03:xxxx:xxxx::xxxx:xx02, icmp_seq=1 hlim=64 time=0.032 ms
^C

Now we run this command:

# ifconfig lo1 down

and trying to ping again:

$ ping xx.xx.xx.2                             
PING xx.xx.xx.2 (xx.xx.xx.2): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host
^C
--- xx.xx.xx.2 ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss

works as expected (and this is what I want) but this command, however:

$ ping6 2a03:xxxx:xxxx::xxxx:xx02
PING6(56=40+8+8 bytes) 2a03:xxxx:xxxx::xxxx:xx02 --> 2a03:xxxx:xxxx::xxxx:xx02
16 bytes from 2a03:xxxx:xxxx::xxxx:xx02, icmp_seq=0 hlim=64 time=0.048 ms
16 bytes from 2a03:xxxx:xxxx::xxxx:xx02, icmp_seq=1 hlim=64 time=0.033 ms
16 bytes from 2a03:xxxx:xxxx::xxxx:xx02, icmp_seq=2 hlim=64 time=0.032 ms
^C
--- 2a03:xxxx:xxxx::xxxx:xx02 ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.032/0.038/0.048/0.007 ms

My question is why is it not the same behavior of ip6 as of ip4?

-- 
//fredan