If a router is not listening for 224.0.0.5 / 224.0.0.6, it should just discard the traffic and not forward it on since 224.0.0.0/24 is link-local scope as decribed in section 4 of RFC5771.
However Section A.1 of RFC2328 does state an expectation of using TTL 1 to protect against flooding across network segments so perhaps some implementations don't respect RFC5771, you could use access lists that work on TTL if you really wanted to - http://www.cisco.com/en/US/docs/ios/12_4t/12_4t2/htaclttl.html On Mon, Aug 5, 2013 at 6:29 PM, <[email protected]> wrote: > I have a small question about ospf > > I know that unicast, multicast and hello packets have 1 ttl ttl but if > a packet with TTL 60 comes from a different geographic continent and my > border router ospf enabled, what should happen? > > > > The edge router will forward on the IP target written in the IP > datagram? > > I guess so, it is a router and It will make his job. > > > > > > The question arose reading this topic: > > [1]http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory > /cisco-sa-20130801-lsaospf > > > > In the topic published by cisco The packet crafted have to know some > info: such as the network placement and IP address of the target router > LSA DB sequence numbers, and the router ID of the OSPF Designated > Router (DR) however in the absence of mechanisms to spoof and MD5 > authentication, > > the IP packet will be rotated correctly toward the target? > > > > Thanks. > > > > > > -- > This message is intended for the individual(s) to whom it is addressed > and may contain information that is privileged or confidential. > If you are not the addressee you must not read,use or disclose the > contents of this email. > Whilst all reasonable care has been taken to avoid the transmission of > viruses, the recipient should carry out virus and other checks, > as they consider appropriate. > Myself accepts no responsibility in this regard. > > References > > 1. > http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130801-lsaospf > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
