tcpdump говорит вот так: 14:17:28.836814 IP (tos 0xc0, ttl 30, id 43056, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:05:5d:8d:8c:bb, length 300, xid 0x78b, secs 64463, Flags [none] (0x600a) Client-Ethernet-Address 00:05:5d:8d:8c:bb [|bootp] 14:17:28.987429 IP (tos 0x0, ttl 64, id 19287, offset 0, flags [none], proto UDP (17), length 330) 10.1.15.123.68 > 10.1.255.254.67: BOOTP/DHCP, Request from 6c:f0:49:91:55:b8, length 302, xid 0xdbb2f01d, Flags [none] (0x0000) Client-IP 10.1.15.123 Client-Ethernet-Address 6c:f0:49:91:55:b8 [|bootp] 14:17:28.987645 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 484) 10.1.255.254.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 456, xid 0xdbb2f01d, Flags [Broadcast] (0x8000) Client-IP 10.1.15.123 Your-IP 10.1.15.123 Client-Ethernet-Address 6c:f0:49:91:55:b8 [|bootp]
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