RE: Multiple targets behind a single IP address

["Jim Hafner" <hafner@almaden.ibm.com>]

Marjorie,

I think I have to ask some questions concerning your quoted statement that
the "TCP connection is the target identifier".    First, the term "target
identifier" is a heavily loaded term in SCSI; is that the sense you meant
it it? Second, how do multiple connections per session, particularly with
connections spanning multiple TCP entities (IPaddresses and IPports) fit in
your picture?  Third, is it the connection itself or the ipaddress/ipport
you're referring to?

Thanks,
Jim Hafner


"KRUEGER,MARJORIE (HP-Roseville,ex1)" <marjorie_krueger@hp.com>@ece.cmu.edu
on 04-09-2001 05:59:54 PM

Sent by:  owner-ips@ece.cmu.edu


To:   "'jojy_michael@agilent.com'" <jojy_michael@agilent.com>,
      ips@ece.cmu.edu
cc:
Subject:  RE: Multiple targets behind a single IP address



The Target Node Address is used in the login phase of the iSCSI protocol.
In order to attempt login, a TCP connection must be first set up.  It is
this connection which is associated with the target when the initiator is
successfully logged in (any PDUs received on that connection are addressed
to the "target the initiator logged into").  There is no connection
association to a target until an initiator is successfully logged in, and
any PDUs received before successful login that are not related to the login
phase (such as a command PDU) should be discarded (not "rejected", since
that could constitute a denial-of-service attack opportunity).

If an initiator is talking to multiple targets behind a single IP address,
it will have at least 1 TCP connection to each target.

The short answer is "the TCP connection is the target identifier" :-)

Marjorie Krueger
Networked Storage Architecture
Networked Storage Solutions Org.
Hewlett-Packard
tel: +1 916 785 2656
fax: +1 916 785 0391
email: marjorie_krueger@hp.com

> -----Original Message-----
> From: jojy_michael@agilent.com [mailto:jojy_michael@agilent.com]
> Sent: Monday, April 09, 2001 11:51 AM
> To: ips@ece.cmu.edu
> Subject: Multiple targets behind a single IP address
>
>
> Section 1.2.7 states that WWUIs are used in iSCSI to provide a target
> identifier for configurations that present multiple targets
> behind a single
> IP address and port.
>
> To provide this support I would expect the target WWUI to be
> in the BHS,
> but, it does not seem to be there. Is the support missing
> from the spec?
>
> - Jojy
>