Public bug reported:
Binary package hint: ifupdown
as stated in RFC3513 section 2.2, among other places, the standard
method of mapping IPv4 addresses into IPv6 address space is by simply
appending them to an IPv6 96-bit prefix.
in most cases, this prefix is the recommended all-zeros, such as
"::66.121.74.90".
ifup configures the default gateway using: route -A inet6 add ::/0 gw
<gateway address> <interface>
this would, inherently, cause the host to route all mapped addresses
upstream to the gateway, which is incorrect.
the solution to this is to use the prefix "2000::/3" which has become
standard practice in most implementations since a couple years after
IPv6's inception in 1998.
** Affects: ifupdown (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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ifup ipv6 incorrectly sets gateway route as ::/0
https://bugs.launchpad.net/bugs/107448
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