ensuite sans vlan, sur eth1, j'ai fait un tcpdump depuis le routeur :
root@box:~# tcpdump -n -i eth1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
12:51:08.516561 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:11.596517 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:14.676513 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:17.766500 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:20.846869 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:23.946509 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:27.026521 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:30.106499 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:33.186539 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:36.266501 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:39.366503 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:42.446507 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:45.526508 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:48.606500 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:51.686513 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:54.766497 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:51:57.846506 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:00.926566 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:04.016506 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:07.096498 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:10.176498 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:13.256510 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:16.336513 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:19.416511 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300
12:52:22.496527 IP 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from cc:2d:1b:XX:XX:XX, length 300