Re: [v6ops] Routers are hosts too!

[Joe Touch <[e-mail]>]

On Jan 10, 2016, at 6:07 AM, [e-mail] wrote:

>>> But then RFC1122 does not mention classless addressing or Variable
>>> Length Subnet Masks - as I recall, they did not exist at that time.
>>> Rather, RFC1122 deals with 32 bit Host addresses and Classful Networks,
>>> ie 8 or 16 or 24 bit addresses, so while you might have more than one
>>> entry in the cache for a given destination, they will all be the same
>>> length so the concept of longest-prefix (and of course, the term prefix
>>> has no meaning at that date) match does not come into consideration.
>> 
>> DO you mean that the longest-prefix match operation was not there since 
>> the earliest days of Internet?
> 
> Reading up on the history of the Internet is recommended. See for
> instance
> 
> https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

Yes, but classless routing has nothing to do with longest prefix. 

Longest prefix is relevant only if the route cache has overlapping rules. That won't happen with host redirects. It only could happen with subnet redirects or manual entries (on a host / on a router, routing protocol entries would also be included.). 

Joe