[mathieu@router ~]$ sudo tcpdump -ni rl1 -vv 
tcpdump: listening on rl1, link-type EN10MB (Ethernet), capture size 96 bytes
12:19:19.249938 IP (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:76:58:45:7d, length: 300, xid:0xeee935eb, secs:45, flags: [none] (0x0000)
          Client Ethernet Address: 00:0c:76:58:45:7d [|bootp]
12:19:42.001305 IP (tos 0x0, ttl 255, id 48974, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:19:42.002056 arp who-has 10.23.200.198 tell 10.23.200.1
12:19:43.463421 IP (tos 0x0, ttl 255, id 48975, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:1, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:19:44.651142 IP (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:76:58:45:7d, length: 300, xid:0x60fef817, flags: [none] (0x0000)
          Client Ethernet Address: 00:0c:76:58:45:7d [|bootp]
12:19:46.198014 IP (tos 0x0, ttl 255, id 48976, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:4, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:19:50.723665 IP (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:76:58:45:7d, length: 300, xid:0x60fef817, secs:6, flags: [none] (0x0000)
          Client Ethernet Address: 00:0c:76:58:45:7d [|bootp]
12:19:50.852823 IP (tos 0x0, ttl 255, id 48977, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:8, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:19:59.397502 IP (tos 0x0, ttl 255, id 48978, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:17, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:20:04.891554 IP (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:76:58:45:7d, length: 300, xid:0x60fef817, secs:21, flags: [none] (0x0000)
          Client Ethernet Address: 00:0c:76:58:45:7d [|bootp]
12:20:08.322764 IP (tos 0x0, ttl 255, id 48979, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:26, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:20:16.465902 IP (tos 0x0, ttl 255, id 48980, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0a:95:bc:04:68, length: 300, xid:0x58910cad, secs:34, flags: [none] (0x0000)
          Client Ethernet Address: 00:0a:95:bc:04:68 [|bootp]
12:20:20.071351 IP (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: UDP (17), length: 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:0c:76:58:45:7d, length: 300, xid:0x60fef817, secs:36, flags: [none] (0x0000)
          Client Ethernet Address: 00:0c:76:58:45:7d [|bootp]