On Aug 20, 2014, at 4:15 AM, Ed Hynan <eh_l...@optonline.net> wrote:
> On Tue, 19 Aug 2014, Charles Musser wrote:
>
>>
>> - <prefix>::1 is the local address of the interface on the IPv6
>> network.
>
> No, *::2 is local.
Ah, yes. Despite my best efforts at copyediting, I had the meanings of *::1 and
*::2 reversed.
>
>> - The "alias" parameter is superfluous in this case. I tried it without
>> that and got the same result: an operating tunnel.
>
> If it works, ifconfig is being smart, but why not make your intent
> explicit? The tunnel is across the ip4 addresses; this command adds
> aliases, or close enough.
Stated another way: the alias keyword doesn't do any harm here, but
using it makes things harder to understand because this isn't actually an
alias; it's a local address and a remote address and this pair comprises
the endpoints of a point-to-point link.
>
> It's ambiguous when you write "the server IP" because the remote end
> of the tunnel is a server, and if you're configuring a router rather
> than a host then that's a server too. Addr *:2 is local in that it's
> an address of your gif(4) interface. The ifconfig(8) synopsis is
> simpler than gif configuration, but yes *::2 is like "dest_address".
Just to clarify, this setup is currently a host, not a router. Given all that,
::2 is the local address and ::1 is remote. Doesn't that make ::1 the
"dest_address"?
Note: possible beating of dead horse here. Feel free to say: "stop
obsessing over the syntax of this command, dummy."
>
> Addr *::1 is remote. Try 'netstat -nvrf inet6 | grep 2001:' and find
> that *::1 has the G (gateway) flag, and host *::2 has a route to *::1.
Output of that is:
default 2001:470:1f04:204::1 UGS 6
146 - 8 gif0
2001:470:1f04:204::1 2001:470:1f04:204::2 UH 1
0 - 4 gif0
2001:470:1f04:204::2 link#6 UHL 0
0 - 4 lo0
This is different than what you describe, but it makes sense. I think.
>
> Also look at something using the interface, maybe ntpd. Look at the
> address with 'netstat -nvf inet6 | grep 123' (no -r there), and
> see that *::2 is local.
Output is:
Active Internet connections
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp6 0 0 2001:470:1f04:204::2.32069
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
tcp6 0 0 2001:470:1f04:204::2.44447
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
tcp6 0 0 2001:470:1f04:204::2.30221
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
tcp6 0 0 2001:470:1f04:204::2.3173
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
tcp6 0 0 2001:470:1f04:204::2.27980
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
tcp6 0 0 2001:470:1f04:204::2.48945
2001:200:dff:fff1:216:3eff:feb1:44d7.80 ESTABLISHED
This seems to confirm what you said. The local endpoint is indeed *::2.
