大华的TFTP刷机的IP地址填写TFTP 服务器IP地址192.168.254.254，设备IP地址192.168.1.108 这些IP不是一层不变的，有些设备的IP并不相同
TFTP from server 192.168.254.254; our IP address is 192.168.1.108; sending through gateway 192.168.1.1

Download Filename 'ID_4D038E1PBQB7E82.txt'.

Download to address: 0x82000000

Downloading: *

[18:28:56.272]收←◆T 

[18:28:57.621]收←◆T 

[18:28:58.970]收←◆T 

[18:29:00.321]收←◆

Retry count exceeded; starting again

tftp receive failed ,please check net environment