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[homenet] homenet-babel-profile: determining link type

"STARK, BARBARA H" <bs7652@att.com> Mon, 20 November 2017 17:02 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: "homenet@ietf.org" <homenet@ietf.org>
Thread-Topic: homenet-babel-profile: determining link type
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Date: Mon, 20 Nov 2017 17:01:18 +0000
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Subject: [homenet] homenet-babel-profile: determining link type
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Hi Juliusz,
Not as chair....
I have a question about the following requirement:

   REQ6: a Homenet implementation of Babel SHOULD distinguish between
   wired and wireless links ; if it is unable to determine whether a link
   is wired or wireless, it SHOULD make the worst-case hypothesis that
   the link is wireless.  It SHOULD dynamically probe the quality of
   wireless links and derive a suitable metric from its quality
   estimation.  The algorithm described in Appendix A of RFC 6126 MAY be
   used.

Some older powerline technologies perform worse than Wi-Fi. But since powerline is "wired", this requirement suggests it would be preferred.
Also, it's not uncommon to use Wi-Fi to Ethernet or powerline bridges in home networks. A router attached to Ethernet that is subsequently bridged to Wi-Fi would look to the router like a wired link.

Should we really only suggest that the router dynamically probe the quality of wireless links? Or would it make sense to suggest dynamic probing of all links, because assuming the entire path between 2 routers uses a single physical layer technology may not be a good assumption?
Barbara

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