Subject: RE: Fwd: Request To Advance: <draft-ietf-ipv6-2461bis-05.txt>

From: "Soliman, Hesham" <[email-masked]>
Date: Thu, 17 Nov 2005 13:06:20 -0500

Sending in hibernate mode.

 > I'm not sure if this one is correctly addressed:
 >   http://www1.ietf.org/mail-archive/web/ipv6/current/msg05107.html
 > (BTW: msg05107 is a comment on version 03, and I could not get a 04
 >  version.  Has that version been issued, or is the version number
 >  bumped?)
 > 
 > I've compared the difference of the state machine in Appendix C
 > between the 03 and 05 versions (attached below).  At least it doesn't
 > seem to cover the case where the neighbor cache entry does not exist.

=> This is not the issue you are pointing to above. This issue above was about receiving
a message without SLLAO. Whether a Neighbor cache entry existed or not doesn't
seem to affect this.

 > It also does not cover the case where a Redirect message (w/o target
 > link-layer address option) caused the situation in question.  In

=> This might be something to discuss. Could you elaborate? Are you saying there
is a Redirect message without the LLAO (that itself is not a problem AFAIK) ?

 > addition, I don't understand the following entry (added in 05):
 > 
 > +   INCOMPLETE      NA, Solicited=any,     Send ICMP error   
 >    unchanged
 > +                   Override=any, No       (if router) or
 > +                   Link-layer address     log error (if host)
 > +
 > 
 > Which ICMP error is expected to be sent in this case?

=> Destination unreachable.

   Why do we
 > separate the case for router and host?

=> Because a host can't send it to anyone. A router would send it to the off-link node
trying to reach the router's neighbo (e.g. when this happens during address resolution). 

Hesham

 > 
 > These points are probably pretty minor, and we can probably deal with
 > those in concurrent with the AD/IESG evaluation, though.
 > 
 > 					JINMEI, Tatuya
 > 					Communication Platform Lab.
 > 					Corporate R&D Center, 
 > Toshiba Corp.
 > 					[email-masked]
 > 
 > --- 03.txt	Mon Nov  7 17:21:58 2005
 > +++ 05.txt	Mon Nov  7 17:22:36 2005
 > @@ -20,11 +20,19 @@
 >                     Override=any           address. Send queued
 >                                            packets.
 >  
 > +   INCOMPLETE      NA, Solicited=any,     Send ICMP error   
 >    unchanged
 > +                   Override=any, No       (if router) or
 > +                   Link-layer address     log error (if host)
 > +
 >     !INCOMPLETE     NA, Solicited=1,        -                
 >    REACHABLE
 >                     Override=0
 >                     Same link-layer
 >                     address as cached.
 >  
 > +   !INCOMPLETE     NA, Solicited=any,     Update content of 
 >    unchanged
 > +                   Override=any, No       IsRouter flag.
 > +                   link-layer address
 > +
 >     REACHABLE       NA, Solicited=1,        -                
 >      STALE
 >                     Override=0
 >                     Different link-layer
 > @@ -89,6 +97,9 @@
 >     !INCOMPLETE     NS, RS, RA, Redirect    Update 
 > link-layer     STALE
 >                     Different link-layer    address
 >                     address than cached.
 > +
 > +   INCOMPLETE      NS, RS No link-layer    -                
 >    unchanged
 > +                   address
 >  
 >     !INCOMPLETE     NS, RS, RA, Redirect    -                
 >    unchanged
 >                     Same link-layer
 > 
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