FYI For IPv6, the TFTP-based network boot process (i.e., pxe) is called Netboot6 & detailed in "24.3.1 Netboot6"/" 24.3.1.2 IPv6-based PXE boot", and for IPV4 PXE we also curate changes/clarifications in "E.4.20 PXE 2.1 specification wire protocol clarifications", all of which are found in https://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf since http://www.pix.net/software/pxeboot/archive/pxespec.pdf is frozen/unmaintained at this point. Vincent From: devel@edk2.groups.io On Behalf Of Bret Barkelew via groups.io Sent: Tuesday, June 29, 2021 9:54 AM To: devel@edk2.groups.io; maciej.rabeda@linux.intel.com; LathaKannan Arumugam Subject: Re: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6 Thanks, Maciej! We'll investigate! - Bret ________________________________ From: Rabeda, Maciej > Sent: Tuesday, June 29, 2021 9:39:59 AM To: devel@edk2.groups.io >; LathaKannan Arumugam >; Bret Barkelew > Subject: Re: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6 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. [cid:image001.png@01D76CD2.39FA0EA0] 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 on behalf of LathaKannan Arumugam via groups.io Sent: Friday, June 25, 2021 1:11:42 PM To: Bret Barkelew ; Rabeda, Maciej ; 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 ; Rabeda, Maciej ; 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 > Sent: Friday, June 25, 2021 9:19 AM To: Rabeda, Maciej >; devel@edk2.groups.io; LathaKannan Arumugam > Subject: Re: [EXTERNAL] Re: [edk2-devel] NetworkPkg: Unexpected DHCP RELEASE after PXE server reply on IPv6 + @LathaKannan Arumugam - Bret ________________________________ From: Rabeda, Maciej > Sent: Friday, June 25, 2021 7:40:16 AM To: devel@edk2.groups.io >; Bret Barkelew >; Bret Barkelew > 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!