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Page 41 | AlliedWare™ OS How To Note: VPNs for Corporate Networks
# FIREWALL configuration
enable firewall
create firewall policy=hq
enable firewall policy=hq icmp_f=all
# Define a firewall dynamic definition to work with dynamic
# interfaces. This provides for the dynamic PPP/L2TP interfaces that
# incoming Windows VPN connections use.
create firewall policy=hq dy=roaming
add firewall policy=hq dy=roaming user=any
# Specify the private and public interfaces. The roaming interface is
# private - you can trust it because it comes from an authenticated
# Windows VPN connection.
add firewall policy=hq int=dyn-roaming type=private
add firewall policy=hq int=vlan1 type=private
add firewall policy=hq int=eth0 type=public
# Create a NAT definition for traffic from the headquarters LAN to
# use when accessing the Internet.
add firewall poli=hq nat=enhanced int=vlan1 gblin=eth0
# Create another NAT definition for roaming VPN clients to use when
# accessing the Internet via the headquarters router.
add firewall poli=hq nat=enhanced int=dyn-roaming gblin=eth0
# Create a rule to allow incoming ISAKMP negotiation to pass through
# the firewall.
add firewall poli=hq ru=1 ac=allo int=eth0 prot=udp po=500
ip=200.200.200.1 gblip=200.200.200.1 gblp=500
# Create a rule to support NAT-T. If there is a NAT gateway in the
# VPN path, NAT-T "port floats" IKE to port 4500, and also
# encapsulates IPsec inside the same port.
add firewall poli=hq ru=2 ac=allo int=eth0 prot=udp po=4500
ip=200.200.200.1 gblip=200.200.200.1 gblp=4500
# Create a rule for the roaming VPN clients. Windows uses L2TP (port
# 1701) inside IPsec. This rule allows traffic that comes from IPsec
# and uses port 1701.
add firewall poli=hq ru=3 ac=allo int=eth0 prot=udp po=1701
ip=200.200.200.1 gblip=200.200.200.1 gblp=1701 enc=ips
# Create a pair of rules to allow office-to-office payload traffic to
# pass through the firewall without applying NAT.
# The rule for the public interface uses encapsulation=ipsec to
# identify incoming VPN traffic.
add firewall poli=hq ru=4 ac=non int=eth0 prot=all enc=ips
# The rule for the private interface uses both source and destination
# addresses to identify outgoing VPN traffic.
add firewall poli=hq ru=5 ac=non int=vlan1 prot=all
ip=192.168.140.1-192.168.140.254
set firewall poli=hq ru=5 rem=192.168.141.0-192.168.144.254