originally from git.lmitsystems.de/lukas/brainfuck2ook.
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Instructions to setup VirtualBox scenario

In each machine, remember to setup the dns server, for example, in /etc/resolv.conf:

nameserver 8.8.8.8

Victim

  • network adapter:
    • Host-only Adapter
  • /etc/network/interfaces:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 10.0.2.20
    netmask 255.255.255.0
    gateway 10.0.2.15

Attacker

  • network adapter:
    • Host-only Adapter
  • /etc/network/interfaces:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 10.0.2.10
    netmask 255.255.255.0
    gateway 10.0.2.15

Gateway

  • network adapter:
    • Bridged Adapter
    • Host-only Adapter
  • /etc/network/interfaces:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet static
    address 10.0.2.15
    netmask 255.255.255.0

Clean IPTABLES:

iptables --flush
iptables --table nat --flush

Configure the Gateway machine as a router:

echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT
iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT