sample_cisco_lab.pol

header {
  comment:: "Denies all traffic to internal IPs except established tcp replies."
  comment:: "Also denies access to certain public allocations."

  comment:: "Ideal for some internal lab/testing types of subnets that are"
  comment:: "not well trusted, but allowing internal users to access."

  comment:: "Apply to ingress interface (to filter traffic coming from lab)"
  target:: cisco allowtointernet
}

term accept-dhcp {
  comment:: "Optional - allow forwarding of DHCP requests."
  destination-port:: DHCP
  protocol:: udp
  action:: accept
}

term accept-to-honestdns {
  comment:: "Allow name resolution using honestdns."
  destination-address:: GOOGLE_DNS
  destination-port:: DNS
  protocol:: udp
  action:: accept
}

term accept-tcp-replies {
  comment:: "Allow tcp replies to internal hosts."
  destination-address:: INTERNAL
  protocol:: tcp
  option:: tcp-established
  action:: accept
}

term deny-to-internal {
  comment:: "Deny access to rfc1918/internal."
  destination-address:: INTERNAL
  action:: deny
}

term deny-to-specific_hosts {
  comment:: "Deny access to specified public."
  destination-address:: WEB_SERVERS MAIL_SERVERS
  action:: deny
}

term default-permit {
  comment:: "Allow what's left."
  action:: accept
}