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To: Martin Petraschek <petraschek@ftw.at>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 07 Apr 2005 09:30:29 -0400
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Subject: Re: IPv6 ICMP multicast response
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"Martin Petraschek" <petraschek@ftw.at> writes:

> By default, FreeBSD does not reply to ICMP multicast echo requests. For IPv4 this behaviour 
> can be changed with
> 
> sysctl  net.inet.icmp.bmcastecho=0|1
> 
> Is there a similar control for IPv6?

No.  That would violate RFC 2463, section 2.4(e.2).
As well as being a bad idea.

If you need it for some custom application that won't be 
connected to the Internet, you can hack the source.