On Wed, 25 Sep 2002, MIP Team wrote:
> Hello,
> I have encountered a very strange problem. While trying to connect
> (via a SOCK_STREAM socket) to a remote system and supplying its link
> local address (FE80:... ) the connect call failed with perror saying
> that the arguments were invalid.
what's the exact address you used? did you specify an interface?
> However when i added a globally unique IP to the same remote system
> (3ffe::4f) and supplied this address to the client, the same
> client-server program worked perfectly fine.
sounds like you missed the interface.
> My question is this: are the link local addresses somethings that
> cannot be used for communicating in the berkley API? or is there
> something that I am missing over here?
again, let me state that i think you missed the interface.
inet6 fe80::200:39ff:fe90:582c%fxp0 prefixlen 64 scopeid 0x1
the interface (..:583c%fxp0) is needed when doing anything over link local
addresses, and you don't have a route set up for the v6 traffic.
[jan@pustulio jan] {57}$ ping6 fe80::a00:20ff:fec0:ffee%fxp0
PING6(56=40+8+8 bytes) fe80::200:39ff:fe90:582c%fxp0 -->
fe80::a00:20ff:fec0:ffee%fxp0
16 bytes from fe80::a00:20ff:fec0:ffee%fxp0, icmp_seq=0 hlim=64
time=8.138 ms
16 bytes from fe80::a00:20ff:fec0:ffee%fxp0, icmp_seq=1 hlim=64
time=8.095 ms
^C
--- fe80::a00:20ff:fec0:ffee%fxp0 ping6 statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/std-dev = 8.095/8.117/8.138/0.021 ms
if, on the other hand, i don't include the interface, i shouldn't be able
to hit that address.
a better example is off of lo0, since i have a default route heading out
the fxp0 interface.
[jan@pustulio jan] {58}$ ping6 fe80::1%lo0
PING6(56=40+8+8 bytes) fe80::1%lo0 --> fe80::1%lo0
16 bytes from fe80::1%lo0, icmp_seq=0 hlim=64 time=0.133 ms
^C
--- fe80::1%lo0 ping6 statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/std-dev = 0.133/0.133/0.133/0.000 ms
[jan@pustulio jan] {59}$ ping6 fe80::1
PING6(56=40+8+8 bytes) fe80::200:39ff:fe90:582c%fxp0 --> fe80::1
^C
--- fe80::1 ping6 statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
it's 3am here. i should be asleep.
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