ipv6 question

[Valdis.Kletnieks at vt.edu (Valdis.Kletnieks at vt.edu)]

On Fri, 11 Mar 2011 11:15:36 PST, ann kok said:

> inet6 addr: fe80::20c:29ff:fe3c:92a1/64 Scope:Link

This is a link level address, only valid on one interface.  So you need to look
at which interface it is attached to in the ifconfig output.

> ping6 fe80::20c:29ff:fe3c:92a1
> connect: Invalid argument

ping6 wants the interface name for link-scope addresses, because on some
hardware setups, the same MAC is used for all interfaces, which means that
each interface has the same link-scope address.  So to disambiguate it,
you have to feed it the interface name so it knows which link to use.

On my laptop, I currently have:

wlan0     Link encap:Ethernet  HWaddr 00:24:D6:53:C5:BA
	inet6 addr: fe80::224:d6ff:fe53:c5ba/64 Scope:Link

% ping  fe80::224:d6ff:fe53:c5ba%wlan0
 ping6  fe80::224:d6ff:fe53:c5ba%wlan0
PING fe80::224:d6ff:fe53:c5ba%wlan0(fe80::224:d6ff:fe53:c5ba) 56 data bytes
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=1 ttl=64 time=0.072 ms
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=2 ttl=255 time=0.081 ms
64 bytes from fe80::224:d6ff:fe53:c5ba: icmp_seq=3 ttl=255 time=0.090 ms
^C
--- fe80::224:d6ff:fe53:c5ba%wlan0 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.072/0.081/0.090/0.007 ms

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