我正在尝试PXE启动Cisco UCS C240服务器以通过网络安装新操作系统,但它在启动期间没有通过DHCP获取IP地址.我从英特尔Boot Agent中收到“未收到DHCP或proxyDHCP优惠”错误. DHCP服务器上的tcpdump显示DHCP服务器计算机上未收到与DHCP相关的数据包：

tcpdump -n -e -i eth2 ether src FC:99:47:49:D4:9E or ether dst FC:99:47:49:D4:9E

但是,当我将计算机引导到已安装的操作系统(在本例中为Windows Server 2012)并为DHCP配置该网络接口时,它会从DHCP服务器获取IP地址.如果我让tcpdump运行,我会看到以下内容：

13:34:36.525646 fc:99:47:49:d4:9e > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 126: 169.254.239.3.54275 > 255.255.255.255.111: UDP, length 84

13:34:40.118071 fc:99:47:49:d4:9e > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 110: 169.254.239.3.137 > 169.254.255.255.137: NBT UDP PACKET(137): REGISTRATION; REQUEST; BROADCAST

13:34:40.888206 fc:99:47:49:d4:9e > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 110: 169.254.239.3.137 > 169.254.255.255.137: NBT UDP PACKET(137): REGISTRATION; REQUEST; BROADCAST

13:34:40.975407 fc:99: