In message <[email protected]>, Brian E Carpenter writes: > On 2012-01-18 11:26, Mark Andrews wrote: > > 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. > > Not true if you have a VPN link to a business partner and you want > your traffic to that partner to use the ULA, which is routed via > the VPN, rather than a GUA that is routed via the Internet.
Which doesn't fall under a *default* policy. You would add the partner's /48 to custom table and distribute it rather than use the default. > Not true if an enterprise uses multiple ULA prefixes internally > for some reason. Again this doesn't fall under a *default* policy. > These cases will need explicit policy table entries if the default > is de-pref as you suggest. And any ULA address that leaks, and they will, will cause back holes to appear, similar to the way broken 6to4 does. Fast retries, similar to HE, will help somewhat but sensible defaults and knowing when to override them work even better. > Brian -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected] -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
