Redirecionamento de tráfego: host Ubuntu 12.10, guest OpenBSD 5.3

• Em /etc/default/ufw:

  DEFAULT_FORWARD_POLICY="ACCEPT"

• Em /etc/ufw/sysctl.conf:

  net/ipv4/ip_forward=1

• Em /etc/ufw/before.rules:

  # nat Table rules
  *nat
  :POSTROUTING ACCEPT [0:0]
  
  # Forward traffic from VMs through eth0.
  -A POSTROUTING -s $vm_net -o eth0 -j MASQUERADE
  
  COMMIT
  

• Então rode:

  sudo ufw enable
  sudo ufw allow from 10.0.2.0/24 to any
  sudo ufw allow from any to 10.0.2.0/24