From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 19 Apr 2014 11:41:45 +0000 (+0100)
Subject: local.m4: Replacing IPv6 host routes with /112 networks.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/firewall/commitdiff_plain/fe52b74088f9ff4d9dc1c6788b7033ba465a35b6?ds=inline;hp=fe52b74088f9ff4d9dc1c6788b7033ba465a35b6

local.m4: Replacing IPv6 host routes with /112 networks.

Linux has a bug: it doesn't make route cache entries for remote hosts
if there's already a host route, and it only attaches path-MTU
information to cache entries.  The result is that it doesn't handle
ICMPv6 `packet too big' messages properly for destinations with host
routes.

I'm bodging this by replacing all of the host routes with tiny /112
networks.  It's awful, but it seems to work.  The convention is that
the `host part' of the net is always zero.
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