Subject: Re: mboned: Path MTU in IPv6 Multicast

From: Bill Fenner <[email-masked]>
Date: Fri, 14 May 2004 16:12:53 -0400

The advanced IPv6 socket API (RFC 3542) provides the
IPV6_USE_MIN_MTU option.  The default value is -1, which says
to perform PMTU discovery for unicast but fragment at the
minimum MTU for multicast.  Zero says to perform PMTU discovery
for both unicast and multicast, and one says to fragment at the
minimum MTU for both unicast and multicast.

My gut says that this default is appropriate for most multicast
applications.  I don't know how widespread implementations of this
socket option (and thus its default setting) are.

  Bill
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