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iptables

gorgoroth:~# ifconfig

eth0 Link encap:Ethernet HWaddr 00:1e:90:79:8a:20

        inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
        inet6 addr: fe80::21e:90ff:fe79:8a20/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth1 Link encap:Ethernet HWaddr 00:80:5a:69:73:1a

        inet addr:10.12.13.1  Bcast:10.12.13.255  Mask:255.255.255.0
        inet6 addr: fe80::280:5aff:fe69:731a/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth2 Link encap:Ethernet HWaddr 00:80:5a:69:6c:e1

        inet addr:10.12.12.1  Bcast:10.12.12.255  Mask:255.255.255.0
        inet6 addr: fe80::280:5aff:fe69:6ce1/64 Scope:Link
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

lo Link encap:Local Loopback

        inet addr:127.0.0.1  Mask:255.0.0.0
        inet6 addr: ::1/128 Scope:Host
        UP LOOPBACK RUNNING  MTU:16436  Metric:1

tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00

        inet addr:10.12.14.1  P-t-P:10.12.14.2  Mask:255.255.255.255
        UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
        

Tabla de rutas

gorgoroth:~# netstat -rn

Kernel IP routing table

Destination Gateway Genmask Flags MSS Window irtt Iface

10.12.14.2 0.0.0.0 255.255.255.255 UH 0 0 0 tun0

192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

10.12.14.0 10.12.14.2 255.255.255.0 UG 0 0 0 tun0

10.12.13.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1

10.12.12.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2

0.0.0.0 192.168.1.3 0.0.0.0 UG 0 0 0 eth0