From: Bob Sinclair (bob@bobsinclair.net)
Date: Fri Mar 13 2009 - 15:03:36 ARST
Hi Narbik,
Do you mean the TTL for RIP and EIGRP is only 2 when the neighbor command is
used? Not what I see when I capture these packets. The TTL is 2 whether
RIP version 1, version 2, broadcast, multicast or unicast. Same with EIGRP,
whether there is a neighbor statement or not.
You know better than to guess!
HTH,
-Bob
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Narbik Kocharians
> Sent: Friday, March 13, 2009 12:06 PM
> To: Bob Sinclair
> Cc: Dale Shaw; Nick; Cisco certification
> Subject: Re: Well Known Multicast Addresses
>
> When it comes to RIP or Eigrp and TTL i guess the neighbor command
> takes
> care of the TTL.
>
> On Fri, Mar 13, 2009 at 8:37 AM, Bob Sinclair <bob@bobsinclair.net>
> wrote:
>
> > Hi All,
> >
> > It seems that the addresses in the 224.0.0.0/24 range are kept from
> > leaking
> > to other links by the address range itself, not by the TTL. Cisco
> > implements
> > both RIP and EIGRP with starting TTL of 2, yet these packets will not
> be
> > forwarded off the link if the they are destined to 224.0.0.9, or
> > 224.0.0.10.
> > To get this protocol traffic to cross to another link (or PVC) we
> need to
> > change the destination to unicast, using neighbor statements.
> >
> > HTH,
> >
> > Bob Sinclair CCIE 10427 CCSI 30427
> > www.netmasterclass.net
> >
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> > > Dale Shaw
> > > Sent: Thursday, March 12, 2009 11:58 PM
> > > To: Nick
> > > Cc: Cisco certification
> > > Subject: Re: Well Known Multicast Addresses
> > >
> > > Hi Nick,
> > >
> > > As Daniel has already pointed out, the third octet for those groups
> is
> > > 1, not 0.
> > >
> > > 224.0.0.0/24 is reserved for local subnetwork control -- things
> like
> > > OSPF, EIGRP, RIPv2, and all that.
> > >
> > > I'm not sure how it's enforced, but theoretically everything using
> > > 224.0.0.0/24 should use a TTL of 1 -- you should never seen
> > > 224.0.0.0/24 groups leaking beyond the local link.
> > >
> > > cheers,
> > > Dale
> > >
> > > On Fri, Mar 13, 2009 at 12:32 PM, Nick <ccieaz@googlemail.com>
> wrote:
> > > > Hi All,
> > > >
> > > > I was making a quick list of well known multicast addresses and
> was
> > > confused
> > > > about these two, are 224.0.0.39 and 224.0.0.40 used for anything
> > > major ?
> > > >
> > > > Thanks
> > > > Nick
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > >
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> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com
> www.Net-Workbooks.com
> Sr. Technical Instructor
>
>
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>
> _______________________________________________________________________
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