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Re: -06 candidate

Mark Andrews <marka@isc.org> Tue, 17 January 2012 22:27 UTC

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To: Arifumi Matsumoto <arifumi@nttv6.net>
From: Mark Andrews <marka@isc.org>
References: <4EB3F3D6.4090302@innovationslab.net> <CAC1-dtnas++ahkBmpdyq7DbyAEg0W6bZY16qGzKmsP10vC39FQ@mail.gmail.com> <4EEA3D20.7020603@innovationslab.net> <CAKFn1SFvs0PzBXtEWWo814Oe5TJmbQEJBm5FeYJY5xzrr=KFSw@mail.gmail.com> <4EEA5793.8080800@gmail.com> <CAKFn1SHA-=cQ_=5rJVLVMvQYXoTL_D1dCR=uWZK-qFrcGp6P-w@mail.gmail.com> <4EEA7AF8.2090508@gmail.com> <0D0150C3-9E05-4839-ACF1-0E7196420D2F@ecs.soton.ac.uk> <CAKFn1SFp_r7EJ6CpM8EF2zkcJz1z34CdEcRt2i5xcsrWkCBQwQ@mail.gmail.com> <EMEW3|bd681ced736eee0700e443f9acc256d8nBFAnB03tjc|ecs.soton.ac.uk|0D0150C3-9E05-4839-ACF1-0E7196420D2F@ecs.soton.ac.uk> <CAC1-dtnt+NKnqJaj-osfxwDf=uLpfv62hBBGDzftGL8KA6jdEA@mail.gmail.com> <6DDA8D20-8D10-4B6E-B101-9812FD83B781@nttv6.net>
Subject: Re: -06 candidate
In-reply-to: Your message of "Tue, 17 Jan 2012 21:39:45 +0900." <6DDA8D20-8D10-4B6E-B101-9812FD83B781@nttv6.net>
Date: Wed, 18 Jan 2012 09:26:53 +1100
Message-Id: <20120117222653.99F9C1B88A6D@drugs.dv.isc.org>
Cc: 6man Mailing List <ipv6@ietf.org>, Tim Chown <tjc@ecs.soton.ac.uk>, draft-ietf-6man-rfc3484-revise@tools.ietf.org
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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: marka@isc.org

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