Additionally, for claim that IPv4 does not do that, please provide Wireshark trace, if available.

On 29-Jun-21 18:36, Maciej Rabeda wrote:

Hi guys,

Finally got some time to look into it.

Long story short, this smells like infrastructure problem.
SARR passes over 546/547 port pair. That is between UEFI PXE client and DHCP server (even if it is the same machine).
The next packet is essentially a Boot Server choice step. UEFI PXE client sends a unicast discovery packet towards Boot server (same machine, same address) coded as DHCP Request.
The release packet is a direct reaction to 3 second timeout (see time diff between packet 9 and 11).

See section 2.2.1 in PXE spec: http://www.pix.net/software/pxeboot/archive/pxespec.pdf

Please verify that your WDS service is running correctly, since clearly there is no reaction to that packet from Boot server.

On 28-Jun-21 22:05, LathaKannan Arumugam via groups.io wrote:

Can you please help us on this issues?

Get Outlook for Android

From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of LathaKannan Arumugam via groups.io <larumugam=microsoft.com@groups.io>
Sent: Friday, June 25, 2021 1:11:42 PM
To: Bret Barkelew <Bret.Barkelew@microsoft.com>; Rabeda, Maciej <maciej.rabeda@linux.intel.com>; devel@edk2.groups.io <devel@edk2.groups.io>
Subject: Re: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6

Any inputs?

We kind of blocked on this for a week. Kindly look into packet capture and suggest a path forward.

From: LathaKannan Arumugam
Sent: Friday, June 25, 2021 9:23 AM
To: Bret Barkelew <Bret.Barkelew@microsoft.com>; Rabeda, Maciej <maciej.rabeda@linux.intel.com>; devel@edk2.groups.io
Subject: RE: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6

Attached packet captured from server.

From: Bret Barkelew <Bret.Barkelew@microsoft.com>
Sent: Friday, June 25, 2021 9:19 AM
To: Rabeda, Maciej <maciej.rabeda@linux.intel.com>; devel@edk2.groups.io; LathaKannan Arumugam <larumugam@microsoft.com>
Subject: Re: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6

+ @LathaKannan Arumugam

- Bret

From: Rabeda, Maciej <maciej.rabeda@linux.intel.com>
Sent: Friday, June 25, 2021 7:40:16 AM
To: devel@edk2.groups.io <devel@edk2.groups.io>; Bret Barkelew <Bret.Barkelew@microsoft.com>; Bret Barkelew <Bret.Barkelew@microsoft.com>
Subject: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6

Looking at it. Any chance to get Wireshark trace for this scenario?

On 25-Jun-21 09:25, brbarkel via groups.io wrote:

Just poking this to see if anyone has any ideas. Thanks!