Subject: [Mipshop] Warning: Bicasting and FMIPv6

From: Greg Daley <[email-masked]>
Date: Fri, 12 Aug 2005 10:40:17 +1000

Dear Mipshop,

I posted about this recently, but it was lost in the noise.

I was at the TCPM WG session where they were discussing
a draft recommending TCP implementation practices.

During the session, there was consensus to move the Eifel
algorithm, to an experimental section of the document
_because_ it has not been widely deployed and because
of existing uncertainties regarding IPR.

What was discussed in the session was the occurrance of
an implementor being presented with a schedule of
charges for licenses by an IPR holder.

Eifel has been described as a way to handle
packet duplication events experienced due to bicasting
in the draft (section 10):

http://www.ietf.org/internet-drafts/draft-elmalki-mobileip-bicasting-v6-06.txt

While the IETF (in compliance with its policy: BCP 79)
will not take a position on the validity of the IPR claims,
please be aware that Eifel is not widely implemented,
and isn't likely to be implemented by default in TCP
stacks, due to its experimental nature.

If bicasting is important, it may be worth investigating if
another mechanism is available for reducing the effect of
duplicated packets on upper layer protocol stacks.

Greg

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