On Mon, Jul 28, 2014 at 2:41 AM, Darren Reed <darr...@freebsd.org>
IPFilter 5 does IPv6 NAT.
With the import of 5.1.2, map, rdr and rewrite rules will all work
NAT66 is a specific implementation of IPv6 NAT behaviour.
2014-07-29 00:07 Kevin Oberman wrote:
And all IPv6 NAT is evil and should be cast into (demonic residence of
choosing) on sight!
NAT on IPv6 serves no useful purpose at all. It only serves to
things and make clueless security officers happy. It adds zero
is a great example of people who assume that NAT is a security feature
IPv4 (it's not) so it should also be in IPv6.
The problem is that this meme is so pervasive that even when people
understand that it is bad, they still insist on it because there will
unchecked box on the security checklist for "All systems not pubic
are in RFC1918 space? -- YES NO". The checklist item should be
"All systems behind a stateful firewall with an appropriate rule set?
YES NO" as it is a stateful firewall (which is mandatory for NAT that
provides all of the security.
I say "usually" because the major research lab where I worked ran
firewall (and probably still does) and little, if any, NAT. It was
regularly by red teams hired by the feds and they never were able to
penetrate anything due to a very aggressive IDS/IPS system, but most
and companies should NOT go this route. I have IPv6 at home (Comcast)
my router runs a stateful firewall with a rule set functionally the
that used for IPv4 and that provides the protection needed.
So putting support for NAT66 or any IPv6 NAT into a firewall is just
things worse. Please don't do it!
R. Kevin Oberman, Network Engineer, Retired
You are missing the point, we are talking about NAT64 (IPv6-only
path to a legacy world), and NPT66 (prefix transalation). I doubt anyone
a traditional NAT in mind.
Consider a small site with uplinks to two service providers: it can use
internally and translate prefix on each uplink.
Please see these short blogs:
- To ULA or not to ULA, That’s the Question
- I Say ULA, You Hear NAT
- PA, PI or ULA IPv6 Address Space? It depends
- Source IPv6 Address Selection Saves the Day
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