Voilà les résultats :
=> tcpdump -nei eth2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), capture size 96 bytes
18:37:17.957979 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:18.957946 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:19.957948 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:21.713434 00:1c:f0:da:b6:3f > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:1c:f0:da:b6:3f, length 300
18:37:22.961948 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:23.961949 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:24.961950 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:27.965807 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:28.965950 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:29.965950 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:31.595014 00:1c:f0:da:b6:3f > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:1c:f0:da:b6:3f, length 300
18:37:32.969950 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:33.969948 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:34.969951 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:37.985811 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:38.985951 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:39.985949 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
18:37:40.993997 00:0e:2e:bc:78:9e > 33:33:00:00:00:fb, ethertype IPv6 (0x86dd), length 102: fe80::20e:2eff:febc:789e.5353 > ff02::fb.5353: 0[|domain]
18:37:40.994059 00:0e:2e:bc:78:9e > 01:00:5e:00:00:fb, ethertype IPv4 (0x0800), length 82: 192.168.1.57.5353 > 224.0.0.251.5353: 0 PTR (QM)? _pgpkey-hkp._tcp.local. (40)
18:37:41.480014 00:1c:f0:da:b6:3f > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 00:1c:f0:da:b6:3f, length 300
18:37:42.989947 00:0e:2e:bc:78:9e > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: arp who-has 192.168.1.1 tell 192.168.1.57
^C
21 packets captured
21 packets received by filter
0 packets dropped by kernel
=> route -n
Table de routage IP du noyau
Destination Passerelle Genmask Indic Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth2
=> ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.57 icmp_seq=1 Destination Host Unreachable
From 192.168.1.57 icmp_seq=5 Destination Host Unreachable
^C
--- 192.168.1.1 ping statistics ---
8 packets transmitted, 0 received, +2 errors, 100% packet loss, time 7008ms
=> ping orange.fr
ping: unknown host orange.fr
[code]=> iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination [/code]