On 14-08-19 10:40 PM, Charles Musser wrote:
I'm experimenting with using IPv6 via a tunnel broker provided by an
ISP. The tunnel works, but I want to confirm my understanding of the
commands they gave me to set it up. These are the commands:
ifconfig gif0 tunnel 50.1.94.112 72.52.104.74
ifconfig gif0 inet6 alias 2001:470:1f04:204::2 2001:470:1f04:204::1 prefixlen
128
route -n add -inet6 default 2001:470:1f04:204::1
[...]
IIRC from my experimentation, you've got it exactly right.
Some tunnel brokers give you subnet masks that certain versions of
OpenBSD don't like - that turns out to not actually matter, just use
whatever ifconfig(8) want. Point in case: HE recommends using /64 for
PtP links, but OpenBSD 5.x requires /128. Since HE allocates an entire
/64 per tunnel, there is no danger in configuring it more narrowly on
the client end.
The hostname.if(5) syntax that finally worked for me on 5.4-RELEASE was
(slightly anonymized)
description HE_TUNNEL_FREMONT
tunnel 184.70.48.XXX
dest 64.71.128.83
inet6 2001:470:XXXX:X::2
dest 2001:470:XXXX:X::1 prefixlen 128
which perhaps adds some clarity, or perhaps confuses, depending on your
point of view. I can't remember whether (in the non-BGP case) I added
the route command as "!route -n add -inet6 default 2001:470:1f04:204::1"
to the hostname.gif0 file, or if I added it to /etc/mygate - one or the
other should work, anyway.
--
-Adam Thompson
[email protected]
