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    Re: ISCSI: Login Parameters - Defaults?



    I agree with David's recommendation that all keys that one
    cares for must be explicitly negotiated, but -
    
    >if the other side happens to use a different
    > default,....
    
    I don't believe that'd be a compliant implementation in such a case. 
    
    I believe the required level of compliance on all defaults is "MUST".
    If not (and coupled with the truth in David's recommendation), I don't 
    particularly care if we do away with defaults.....
    
    Thanks.
    --
    Mallikarjun
    
    Mallikarjun Chadalapaka
    Networked Storage Architecture
    Network Storage Solutions Organization
    Hewlett-Packard MS 5668 
    Roseville CA 95747
    cbm@rose.hp.com
    
    
    ----- Original Message ----- 
    From: <Black_David@emc.com>
    To: <kevin_lemay@agilent.com>
    Cc: <ips@ece.cmu.edu>
    Sent: Saturday, April 27, 2002 10:15 PM
    Subject: RE: ISCSI: Login Parameters - Defaults?
    
    
    > Kevin,
    > 
    > Part of what's going on here is that a robust implementation
    > minimizes assumptions about what the other party to the communication
    > will do - this is part of the usual IETF admonition to be
    > conservative in what is sent and liberal in what is accepted.
    > If the default value is for convenience/preference and your
    > implementation can cope if the other side happens to use a different
    > default, then there's no need to negotiate that key.  OTOH, if us
    > of the default is important to your implementation for some reason,
    > it is incumbent upon you to negotiate it.  It is not robust
    > to assume that the other side will use the default in the absence
    > of negotiation and then complain that it's the other implementation's
    > fault that things went wrong when it didn't use the specified
    > default -- it was your responsibility to negotiate the key if
    > you cared about its value.  Yes, this results in potentially
    > verbose negotiations, but it reduces the possibility for confusion
    > about what's supposed to happen as a result.
    > 
    > Thanks,
    > --David
    > 
    > -----Original Message-----
    > From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
    > Sent: Thursday, April 25, 2002 3:33 PM
    > To: LEMAY,KEVIN (A-Roseville,ex1)
    > Cc: ips@ece.cmu.edu
    > Subject: RE: ISCSI: Login Parameters - Defaults?
    > 
    > 
    > 
    > I am trying again - If you are happy with the dafualt don't do anything. If
    > you want to change it you must negotiate - not just answer to an implied
    > offer. 
    > 
    > Julo 
    > 
    > 
    > "LEMAY,KEVIN (A-Roseville,ex1)" <kevin_lemay@agilent.com> 
    > 04/25/2002 10:04 PM 
    > Please respond to "LEMAY,KEVIN (A-Roseville,ex1)" 
    >         
    >         To:        Julian Satran/Haifa/IBM@IBMIL 
    >         cc:        ips@ece.cmu.edu 
    >         Subject:        RE: ISCSI: Login Parameters - Defaults? 
    > 
    >        
    > 
    > 
    > Julian,
    > 
    > But defaults are an implicit offer. If I do not offer the key the I am
    > assuming the default.
    > 
    > Can you re-word the sentence to incorporate what you just explained in the
    > e-mail... This is much clearer, at least to me.
    > 
    > Kevin
    > 
    > 
    > -----Original Message-----
    > From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
    > Sent: Thursday, April 25, 2002 11:47 AM
    > To: LEMAY,KEVIN (A-Roseville,ex1)
    > Cc: ips@ece.cmu.edu
    > Subject: Re: ISCSI: Login Parameters - Defaults?
    > 
    > 
    > 
    > It means only that regardless of the fact that a default is available if you
    > state first a key=value you are the originator and the other party MUST
    > respond unless specified otherwise (as in booleans). In other words there is
    > no such think as an implicit offer of the current or default value. 
    > 
    > Julo 
    > 
    > 
    > 
    >                 "LEMAY,KEVIN (A-Roseville,ex1)" <kevin_lemay@agilent.com> 
    > 
    > 
    > 04/25/2002 07:01 PM 
    > Please respond to "LEMAY,KEVIN (A-Roseville,ex1)" 
    > 
    > 
    >        
    >        To:        Julian Satran/Haifa/IBM@IBMIL 
    >        cc:        ips@ece.cmu.edu 
    >        Subject:        ISCSI: Login Parameters - Defaults? 
    > 
    >       
    > 
    > 
    > Page 64 in iSCSI v12 says,
    > 
    > "All negotiations are stateless and explicit (i.e., the result MUST be
    > based only on newly exchanged values). There is no such thing as implicit
    > offers. If an explicit offer is not made then a reply cannot be expected."
    > 
    > It is unclear to me how this is supposed to work. Does this mean that I must
    > negotiate every key pair? This is confusing because chapter 11 still
    > contains default values.
    > 
    > If I do not negotiate a parameter, is it assumed to be set at the default or
    > must I negotiate every parameter ?
    > 
    > If I must negotiate every parameter, then the "default" value should be
    > removed or renamed to "suggested setting".
    > 
    > Thanks,
    > 
    > Kevin Lemay
    > 
    
    


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Last updated: Mon Apr 29 14:18:25 2002
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