Subject: RE: [2461bis] host variables on router

From: "Soliman, Hesham" <[email-masked]>
Date: Sun, 20 Feb 2005 18:19:04 -0500

Sorry for the late reply.

 > 6.2.1. says,
 > 
 >    2369    The above variables contain information that is 
 > placed in outgoing 
 >    2370    Router Advertisement messages.  Hosts use the 
 > received information to 
 >    2371    initialize a set of analogous variables that 
 > control their external 
 >    2372    behavior (see Section 6.3.2).  Some of these host 
 > variables (e.g., 
 >    2373    CurHopLimit, RetransTimer, and ReachableTime) 
 > apply to all nodes 
 >    2374    including routers.  In practice, these variables 
 > may not actually be 
 >    2375    present on routers, since their contents can be 
 > derived from the 
 >    2376    variables described above.  However, external 
 > router behavior MUST be 
 >    2377    the same as host behavior with respect to these 
 > variables.  In 
 >    2378    particular, this includes the occasional 
 > randomization of the 
 >    2379    ReachableTime value as described in Section 6.3.2. 
 > 
 > Especially,
 > the sentence - "external router behavior MUST be the same as 
 > host behavior with respect to these variables.",
 > is unclear for me.
 > 
 > Does it mean that
 > the router has the same values as what the host receives from RA?

=> I believe it means that while the exact same variable might not
exist in hosts and routers, the external behaviour (on the wire)
should be consistent on both ends. For instance, if the IsRouter
falg does not exist in the router, it still has to send NAs with 
the R flag set. I hope this clarifies it. 

Hesham

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