Date: Mon, 15 Oct 2001 09:36:52 -0700 From: Bill Fenner <fenner@research.att.com> To: deepika_77@yahoo.com Cc: freebsd-net@freebsd.org Subject: Re: mrouted 3.8(how to find multicast members??) Message-ID: <200110151636.JAA16632@windsor.research.att.com>
next in thread | raw e-mail | index | archive | help
> But the definition of threshhold TTL says that a
>incoming multicast packets will be forwarded out of an
>interface only if it has the TTL value >= threshold
>TTL of that interface. Am I right?
No. Zero is special, and means do not forward. If you have
the kernel source, check out the ip_mdq() function in
/sys/netinet/ip_mroute.c; the check is:
if ((rt->mfc_ttls[vifi] > 0) &&
(ip->ip_ttl > rt->mfc_ttls[vifi])) {
(the threshold > 0 and the TTL > the threshold -- note, >, not >=.)
Bill
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200110151636.JAA16632>