nanog mailing list archives
RE: Rip again!
From: "Chris Ranch" <CRanch () Affinity com>
Date: Sun, 21 Aug 2005 14:15:40 -0400
In case no one else has suggested it: the source MAC address will identify the source. Chris
-----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
Current thread:
- Rip again! Tom Sanders (Aug 21)
- RE: Rip again! Scott Morris (Aug 21)
- <Possible follow-ups>
- RE: Rip again! Chris Ranch (Aug 21)
- Re: Rip again! Crist Clark (Aug 23)