In message <[EMAIL PROTECTED]>, Hiroki Ishibashi writes:
>Steven M. Bellovin wrote:
>
>>I'm still confused. If a packet arrives on a site-enabled interface,
>>addressed to multicast address AllSPFRouters, and with protocol number
>>89 (OSPF), to which process is it delivered? Does something actually
>>peek inside the packet to see if it's advertising global or site-local
>>addresses when making the dispatching decision?
>
>"2.4. Explicit support for multiple instances per link" in RFC2740
>is the one to be used to identify a process (instance) to which packet
>are delivered. Not necessary to peek into LSAs for the dispatching
>decision.
>
I must be missing something; I still don't understand.
Let's look at a simple case, a router with two physical interfaces with
one attached to the site backbone, and one feeding a departmental LAN.
I'm perfectly willing to assume multiple logical interfaces on either
physical interface.
Let's consider the backbone interface. It's going to be seeing two
types of routing advertisement, site-local and global. When an
incoming OSPF packet arrives, it's addressed to the same multicast
address in either case. To which logical interface does it belong?
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com ("Firewalls" book)
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