From: Scott Morris (swm@emanon.com)
Date: Mon Oct 17 2005 - 00:03:30 GMT-3
Broadcasts to 255.255.255.255 inherently have TTL1, as they are local link
as well...
As for the unicasts, I've never paid attention in a sniffer for it, but I
would assume that it would follow the same length. Spec says that neighbors
are supposed to share a common subnet, but I've never tried making a RIP
neighbor further away without tunnels involved!
Give it a whirl, see what happens! Don't forget to use "no
validate-update-source" though to avoid confusions.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jongsoo
Sent: Sunday, October 16, 2005 10:49 PM
To: Scott Morris
Cc: Chris; Tim; ccielab@groupstudy.com
Subject: Re: TTL on RIP updates
That proves the multicast should be 1.
What about the broadcast/unicast rip packets?
I think they all should be 1 as well
Are there any supporting standards? or IOS just does that?
On 10/16/05, Scott Morris <swm@emanon.com> wrote:
>
> All packets using 224.0.0.x (link local multicast) are, as defined,
> link local. Meaning the TTL is 1.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Chris
> Sent: Sunday, October 16, 2005 10:13 PM
> To: 'Tim'; ccielab@groupstudy.com
> Subject: RE: TTL on RIP updates
>
> Looking through the RFC, there does not seem to be anything that
> specifies that an IP packet containing a RIP update should mark IP
> header TTL any differently then whatever the default IP stack
> implementation dictates for a TTL. I would not think there would be
> any reason to do so since RIP normally sends updates to neighbors by
> broadcast or multicast which would bound the packet to the closest
> router where TTL would normally decrement, but that is just me
> theorizing. As I said the rfc does not say anything about marking the
> IP header TTL for RIP any differently.
>
>
>
>
> Chris
>
>
>
> --------------------------------------------------
>
> Christopher Larson CCIE#12380, PMP
> Superior Technology Networks Corp
> www.supertechnetworks.com <http://www.supertechnetworks.com> -
> Technology Consulting www.ccierackrental.com
> <http://www.ccierackrental.com> -Cisco Rack Rental
> tel: 703 577 3303 fax: 703 286 5018
>
> --------------------------------------------------
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Tim
> Sent: Sunday, October 16, 2005 4:24 PM
> To: ccielab@groupstudy.com
> Subject: TTL on RIP updates
>
> Hi guys,
>
>
>
> I seem to recall that the TTL for rip updates is 2.
>
>
>
> Is that true only if the neighbor command is used? Or if the default
> dest address is 224.0.0.9 <http://224.0.0.9>? Or, never?
>
>
>
> TIA, Tim
>
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