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Re: Rip again!

  • From: Crist Clark
  • Date: Tue Aug 23 15:56:52 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@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Scott Morris
Sent: Sunday, August 21, 2005 9:21 AM
To: 'Tom Sanders'; nanog@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@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Tom Sanders
Sent: Sunday, August 21, 2005 12:13 PM
To: nanog@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@globalstar.com
Globalstar Communications                                (408) 933-4387

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