[OpenWrt-Devel] firewall instead of routing rules to keep ULAs from escaping
cyrus at openwrt.org
Tue Jun 16 12:56:34 EDT 2015
Source-Destination matching is done in the regular routing table.
E.g. for my he.net connection the v6 routing table looks like this:
default from 2001:470:xx:yyy::/64 dev 6in4-henet proto static metric 1024
default from 2001:470:zzzz::/48 dev 6in4-henet proto static metric 1024
if you try to send with a ULA there is no matching route since there is
no unspecific default route.
Also I disagree about the general usefulness of a fc00::/7 block. I can
imagine e.g. a VPN-scenario where (on top of tunneling internet access)
you access certain local services which have ULAs. This would
essentially be broken by your generic rule for not much added gain.
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