[babel] Shepherd's review of draft-ietf-babel-dtls-02

Donald Eastlake <d3e3e3@gmail.com> Mon, 07 January 2019 05:17 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Mon, 7 Jan 2019 00:17:36 -0500
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To: Babel at IETF <babel@ietf.org>
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Subject: [babel] Shepherd's review of draft-ietf-babel-dtls-02
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Here are some comments on the draft:

Abstract and Introduction: Replace "describes" with "specifies".

Section 2.1, top of page 4, says "When a node receives a new DTLS
connection, it MUST verify the source IP address, and reject the
connection if the address is not an IPv6 link-local address." Would it
be correct to replace this with "When a node receives a new DTLS
connection, it MUST verify that the source IP address is an IPv6
link-local address; if it is not, it MUST reject the connection." or
is there some other sort of verification it must do?

Last paragraph of Section 2.3: I'm not sure about "unprotected
implementation of Babel". Maybe "Babel implementation without DTLS
support". Also, the reference to replacing "TLV"s seems odd. Can't
there be multiple TLVs in a message? Maybe "replacing any multicast
Babel routing protocol message with unicast transmission of the
message to each known neighbor except that neighbor discovery Hello
TLVs MUST still be multicast." or something like that.

IANA Considerations: As are probably aware, Section 8.1.1 of RFC 6335
is about applying for port numbers (and service names, which would, as
you say, be "babel-dtls" in this case). A completed application
template could be included as an appendix, though that is not

Security Considerations, first sentence: Maybe "The interaction" ->
"Confidential interaction".

Security Considerations and rfc6126bis seem to say that Babel can run
over IPv4 but the last paragraph of Section 2.1 seems to be limited to

I'm not sure why Performance Considerations is an Appendix rather than
a section of the main text. But I guess it's OK either way.

Minor wording suggestions, adopt or ignore as you choose:

Abstract and Introduction: in the first line, insert "base" before
"Babel Routing Protocol".

Section 1.2: Delete "very".

 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 1424 Pro Shop Court, Davenport, FL 33896 USA