[Mud] MUD file for DNS probes, avoiding non-public address space
Michael Richardson <mcr+ietf@sandelman.ca> Fri, 20 September 2019 17:18 UTC
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From: Michael Richardson <mcr+ietf@sandelman.ca>
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Date: Fri, 20 Sep 2019 13:18:52 -0400
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Subject: [Mud] MUD file for DNS probes, avoiding non-public address space
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The RIPE Atlas probes do distributed DNS monitoring.
There is a lot that a MUD file could do to restrict other unwanted traffic,
even if we have to write an ACL allowing traffic to 0.0.0.0/0 port 53.
In IPv6, it's more properly 2000::/3 port 53, which nicely rules out
DNS traffic to ULAs, link-locals, multicast, mapped IPv4 and default NAT64
space, etc.
{If 4000::/3 gets deployed by IANA, I think we'll have decades of notice}
Maybe 0.0.0.0/0 should really read:
0.0.0.0/5 (0.0.0.0 -> 7.255.255.255)
8.0.0.0/7 (8.0.0.0 -> 9.255.255.255)
omitted 10.0.0.0/8
11.0.0.0/8
12.0.0.0/6
16.0.0.0/4
32.0.0.0/3
64.0.0.0/3 (64.0.0.1 - 95.255.255.254)
96.0.0.0/6 ... you get the idea.
quite annoyance.
So, what we want is to whitelist 0.0.0.0/0 and then blacklist RFC1918 and
100.64.0.0/10, and class D space. (maybe not class E space)
I have to back to the document to remember if we can actually do plus and
minus, etc.
Maybe there should be a macro for this?
--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
-= IPv6 IoT consulting =-
- [Mud] MUD file for DNS probes, avoiding non-publi… Michael Richardson