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Hello Siv= a,

&nbs= p;

When look= ing into the NetworkPkg Ip6ConfigImpl.c and PxeBcDriver.c we are setting th= e IAID as you stated below, though Ip6ConfigImpl does check if the IAID IpS= b Instance is already created before it generates its own.

&nbs= p;

Because t= he PxeBcDriver creates the Instance and profile first there should not be 2= IAID=A1=AFs during that operational flow.

&nbs= p;

Thanks,

Zack=

&nbs= p;

From: Sivaraman Nainar <sivaramann@ami.c= om>
Sent: Tuesday, October 3, 2023 10:49 AM
To: devel@edk2.groups.io; Kasbekar, Saloni <saloni.kasbekar@intel= .com>; Clark-williams, Zachary <zachary.clark-williams@intel.com><= br> Cc: Santhosh Kumar V <santhoshkumarv@ami.com>; Mike Su (=E1=CC=D4=F0=E6=DE) <Mi= keSu@ami.com>; Dhanaraj V <vdhanaraj@ami.com>
Subject: RE: reg: Two IAID assignment for single MAC Address

 

+ Saloni = and Zachary.

&nbs= p;

From: Sivaraman Nainar
Sent: Tuesday, October 3, 2023 10:39 PM
To: devel@edk2.groups.io= ; Maciej Rabeda <maciej= .rabeda@linux.intel.com>
Cc: Santhosh Kumar V <s= anthoshkumarv@ami.com>; Mike Su (=E1=CC=D4=F0=E6=DE) <MikeSu@ami.com>; Dhanaraj V <vdhanaraj@ami.com&= gt;
Subject: reg: Two IAID assignment for single MAC Address<= /span>

 

Hello Maciej:

 

When IPV6 PXE Boot performed in the environment wher= e client and server are connected behind Routers, there are two SARR proces= s happens, and both are using different IAID=A1=AFs.

 

During the PXE Boot IPV6, SARR Process Initiated to = get the Boot File information. During that time one IAID Created (ff76fdbd)= . PxeBcCreateIp6Children()<= /o:p>

During the Router Advertisement , SARR Process Initi= ated to get the Boot File. Ip6ConfigInitInstance()

 

Besides, according to= the definition of IA(RFC-3315):

 

An "= identity-association" (IA) is a construct through which a server
and a client can identify, group, and manage a set of related IPv6
addresses. Each IA consists of an IAID and associate= d configuration
information.

A client must associate at least one distinct IA with each of its
network interfaces for which it is to request the assignment of IPv6
addresses from a DHCP server. The client uses the IAs assigned to an
interface to obtain configuration information from a server for that
interface. Each IA must be associated with exactly o= ne interface.

 

But as per EDK2 Network Implementation it defines tw= o IA IDs for same client.  Is there any reasoning behind this implemen= tation?

 

What if both the process uses Same IAID?<= /p>

 

Thanks

Siva

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