I have the following network topology:
<prefix> (ipv6 only) <prefix> (ipv6 only)
________________________________________
___________________________________
| | \ / |
|
| | \ / |
|
<prefix>::IPv4 <prefix>::IPv4 \ / <prefix>::IPv4
<prefix>::IPv4
____|______ _______|___ | | _____|____
____|______
| | | | | | | | |
| |
| A | | B | <prefix>::1 | C | |
D |
| (linux) | | (linux) | | | | (linux) |
| (linux) |
|__________| |___________| | <prefix>::1 |__________|
|___________|
| | | | |
|
IPv4 IPv4 ___|_|____
IPv4 IPv4
| | | |
| |
| | | E | |
|
| | | (freeBSD)| Router
| |
| | |__________|
| |
| | | |
|
| | <prefix>::IPv4
| |
| | IPv4
| |
| | | |
|
|_______________________|___________________|___________________|__________________|
| | |
| | (IPv4/IPv6) |
| | |
IPv4 IPv4 IPv4
<prefix>::IPv4 <prefix>::IPv4 <prefix>::IPv4
| | |
| | |
___|_____ ____|_____ ____|_____
| | | | | |
| F | Router | G | | H
|
|(freeBSD)| DNSv6 | (linux) | | (linux)
| Router
|_________| |_________| |_________|
|| ||
tunnel (gif0) tunnel 6to4
to 6BONE to
6to4.ipv6.microsoft.com
My question is:
the machines under the network (ipv4/ipv6) autoconfigures with 2 default
routes, and
they have 2 autoconfigure address, one under 3ffe:: (announce by F) and
other under 2002:: (by H)
If the freeBSD box (F) shut down, all the machines under IPv4/IPv6 has
outside connection through
the 6to4 tunnel (H), only if they choose the 2002:: prefix as source
address.
Like (F) has died, the autoconfigure address under 3ffe:: expire and the
only global address
becomes the 2002::, so there is no problem.
Now, the machine (E) has also 2 default routes, like the previous case.
It acts like a
default router for 2 subnets IPv6 only, and announce 2 sub-prefix under
3ffe::
It also announce the 6to4 prefix (2002::) to the 2 IPv6 networks.
If (E) shut down, the IPv6 only networks have not outside connection.
This is OK.
But what does it happens if the router (F) died ??
For the IPv4/IPv6 network, all is OK, but for the IPv6 only netwoks...
they will have
outside connection only and only if their packets have the 6to4 source
address, but
how are they aware of this ??... they machines under IPv6 only networks
have the
3ffe:: prefix... how do they notice that this prefix have not outside
connection ???
Thanks in advance...
--
*****
JFRH
*****
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