I found the culprit

Thank you so much George !!!

The output pcap
output.pcap

Hi George,
Thank you for your answer. This is my Output Pcap

Hi all,

I’m having an error connecting a PXE client. DHCP gives me the good ip in good range (10.171.27.xxx), but after TFTP in IPXE is 192.168.1.xxxx.
Sometimes it’s works randomly and TFTP Ip is good.
Fog server is 10.171.27.241

My error

My /tftpboot/default.ipxe

Thanks for your help.