ULA need to be de-preferenced except for the local ULA prefixes.
Below is what I use in FreeBSD 8. It keeps local traffic using
fd92:7065:b8e::/48 rather than using the PA address. If you learn
a ULA destination address that is not local YOU DO NOT WANT TO USE
IT by default when you have another choice.
What you do want is for a interface when it learns a ULA address
to add the corresponding /48 prefix with a given precedence and a
unique label to the table if the prefix does not exist. And
appropriate cleaning be done when no more interfaces exist in the
/48. This may require a manual tag on table entries.
Mark
> more /etc/ip6addrctl.conf
#Prefix Prec Label
::1/128 50 0
::/0 40 1
2002::/16 30 2
::/96 20 3
::ffff:0.0.0.0/96 35 4
fd92:7065:b8e::/48 45 5
fc00::/7 5 6
> ifconfig nfe0 inet6
nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=82008<VLAN_MTU,WOL_MAGIC,LINKSTATE>
inet6 fe80::218:f3ff:feba:9a37%nfe0 prefixlen 64 scopeid 0x5
inet6 fd92:7065:b8e:0:218:f3ff:feba:9a37 prefixlen 64 autoconf
inet6 2001:470:1f00:820:218:f3ff:feba:9a37 prefixlen 64 autoconf
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [email protected]
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