Re: config as an exit of "IPv6 over IPv4 tunnel"

[Matthew Seaman]

Hashimoto wrote:

Can I configure FreeBSD as an exit of "IPv6 over IPv4 tunnel"?

Let me explain it in detail.
Both hostA and hostB have global IPv4 address.
And hostA has global IPv6 address.
I have installed FreeBSD 7.0 on both hostA and hostB.
Then, I want to config "IPv6 over IPv4 tunnel" from hostB to hostA.
Is it possible?

Yes, absolutely.  I have a similar configuration for my IPv6 connectivity.
There are some alternatives (stf(4), faith(4)), but this is based I what
I have.

This is mostly in terms of what you'ld add to /etc/rc.conf on HostB --
HostA will be similar, but addresses will be reversed in the obvious
places.

i) Create a gif(4) interface and configure the endpoints:

gif_interfaces="gif0"
gifconfig_gif0="hostB-ipv4-number hostA-ipv4-number"


default for an allocation of a chunk of IPv6 address space.) Adjust
the prefixlen to suit.

ipv6_enable="YES"
ipv6_defaultrouter="-interface gif0"
ipv6_default_interface="gif0"
ipv6_ifconfig_gif0="1234:5678:9abc:def0::1 prefixlen 64"

iii) Settings on HostA are slightly different -- HostA has to be a
router, and it only wants to route the HostB block via the gif(4)
tunnel:

ipv6_enable="YES"
ipv6_defaultrouter="hostA-ipv6-gateway-address"
ipv6_gateway_enable="YES"

ipv6_static_routes="hostB"
ipv6_route_hostB="1234:5678:9abc:def0:: -prefixlen 64 -interface gif0"


assign IPv6 addresses to anything on the same local subnet as HostB.
In fact, you can use rtadvd(8) on HostB to make that automatic:

ipv6_network_interfaces="auto"
ipv6_prefix_em0="1234:5678:9acb:def0"
rtadvd_enable="YES"
rtadvd_interfaces="em0"

Then just run rtsol(8) on all the other machines that will use HostB as
their IPv6 gateway.

        Cheers,

        Matthew

--
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
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PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
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ii) Enable IPv6 on HostB -- I'm assuming you've assigned a /64 net block to HostB (perhaps a tad excessive, but pretty much the iv) That should be everything you need to get point to point connectivity working. Note: it's pretty easy now to make HostB an IPv6 router and

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