Rip again!

Tue Aug 23 19:54:05 UTC 2005

Chris Ranch wrote:
> In case no one else has suggested it: the source MAC address will
> identify the source.

You can also can play with the routing tag within each RIP routing
entry if your implementation is flexible enough.

>>-----Original Message-----
>>From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On 
>>Behalf Of Scott Morris
>>Sent: Sunday, August 21, 2005 9:21 AM
>>To: 'Tom Sanders'; nanog at nanog.org
>>Subject: RE: Rip again!
>>
>>
>>How about the source IP?
>>
>>RIP v1 is sent to 255.255.255.255 broadcast.  RIPv2 is sent 
>>to 224.0.0.9 multicast.  Both are local-link only, so won't 
>>go THROUGH a router.  The sending source IP will tell you 
>>where they came from.
>>
>>If you're using VLANs (trunks), there won't be any issues.  
>>If you're using
>>secondary addresses, this will depend on whose devices you 
>>use.   In the
>>Cisco world, packets will always be sourced from the primary 
>>IP address on an interface.  And if the receiving router 
>>doesn't have a subnet matching the sender, packets/updates 
>>are ignored.  (Again, Cisco world you can use "no 
>>validate-update-source" to override this check)
>>
>>But that gives you a tracking method on packets.  
>>
>>Scott 
>>
>>-----Original Message-----
>>From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On 
>>Behalf Of Tom Sanders
>>Sent: Sunday, August 21, 2005 12:13 PM
>>To: nanog at nanog.org
>>Subject: Rip again!
>>
>>
>>Hi,
>>
>>There isnt IMO a way in RIP to identify the source of the RIP 
>>packet (the way we have Router ID in OSPF, system ID in ISIS, etc.)
>>
>>Now assume we have 2 vlans defined on an ethernet. Thus we 
>>would have two IP interfaces, 1.1.1.1/24 and 2.2.2.2/24 and 
>>both using the same physical interface. RIP is running on 
>>both these interfaces.
>>
>>My doubt is that how will another router, which is configured 
>>in the same way (2 vlans) be able to differentiate between 
>>the RIP responses originated by 1.1.1.1 and 2.2.2.2?
>>
>>Thanks,
>>Toms
>>
>>
> 
> 
> 

-- 
Crist J. Clark                               crist.clark at globalstar.com
Globalstar Communications                                (408) 933-4387

The information contained in this e-mail message is confidential,
intended only for the use of the individual or entity named above.
If the reader of this e-mail is not the intended recipient, or the
employee or agent responsible to deliver it to the intended recipient,
you are hereby notified that any review, dissemination, distribution or
copying of this communication is strictly prohibited.  If you have
received this e-mail in error, please contact postmaster at globalstar.com