Create a site-to-site RED tunnel

Set up a site-to-site RED tunnel between two Sophos Firewall devices without deploying a RED device. In this configuration, one firewall acts as the server and the other as the client.

Objectives

You'll learn to do the following:

• Add a RED interface on the Firewall RED Server and Firewall RED Client.
• Add a static route on both firewalls so that internal networks have a route across the RED tunnel.
• Add a firewall rule on both firewalls for tunnel traffic.

Network diagram

Add a RED interface on the Firewall RED Server

The Firewall RED Server listens for incoming connections, and the Firewall RED Client initiates the outgoing connection. Translating the Firewall RED Server's address may interfere with incoming connections. We recommend that you don't use NAT for the Firewall RED Server.

1. On the Firewall RED Server, go to System services > RED and turn on the RED provisioning service.
2. Go to Network > Interfaces, click Add interface, and click Add RED.

3. Configure as follows:

   Setting	Description	Value
   Branch name	RED interface name	REDserver
   Type	RED interface type	Firewall RED server
   Tunnel ID	Tunnel ID setting	Automatic
   RED IP	Firewall RED Server's RED IP address.	192.100.100.1
   Zone	RED interface zone	LAN

4. Click Save.

   The firewall generates a provisioning file.

5. On the RED interface, click Menu and download the provisioning file.

   

6. Copy the file to a network location or removable drive that you can access from the Firewall RED Client.

Add a RED interface on the Firewall RED Client

1. Go to System services > RED and turn on the RED provisioning service.
2. Go to Network > Interfaces, click Add interface, and click Add RED.

3. Configure as follows:

   Setting	Description	Value
   Branch name	RED interface name	REDclient
   Type	RED interface type	Firewall RED client
   Firewall IP/hostname	Firewall RED Server's WAN IP address.	172.10.10.1
   Provisioning file	The provisioning file you downloaded from the Firewall RED Server.	Click Browse and select the provisioning file you downloaded from the Firewall RED Server.
   RED IP	Firewall RED Client's RED IP address.	192.100.100.2
   Zone	RED interface zone	LAN

4. Click Save.

Add static routes

You must configure static routes on both firewalls so that internal networks have a route across the RED tunnel.

1. On the Firewall RED Server, go to Routing > Static routes.
2. Under IPv4 unicast route, click Add.

3. Configure as follows:

   Setting	Description	Value
   Destination IP / Netmask	Firewall RED Client's LAN network and netmask.	192.20.20.0 and /24 (255.255.255.0)
   Gateway	Firewall RED Client's RED IP address.	192.100.100.2

   Note

   ARP requests are sent to identify the interface over which the destination IP address behind the peer RED is reachable. To make sure these requests reach the destination, don't select an interface.

4. Click Save.

5. On the Firewall RED Client, go to Routing > Static routes.
6. Under IPv4 unicast route, click Add.

7. Configure as follows:

   Setting	Description	Value
   Destination IP / Netmask	Firewall RED Server's LAN network and netmask.	192.10.10.0 and /24 (255.255.255.0)
   Gateway	Firewall RED Server's RED IP address.	192.100.100.1

   Note

   ARP requests are sent to identify the interface over which the destination IP address behind the peer RED is reachable. To make sure these requests reach the destination, don't select an interface.

8. Click Save.

Add firewall rule

For traffic to pass between the two firewalls, you must create a LAN-to-LAN or a similar rule on each firewall.

Do as follows on the Firewall RED Server and Firewall RED Client:

1. Go to Rules and policies > Firewall rules.
2. Select IPv4, click Add firewall rule, and click New firewall rule.

3. Configure as follows:

   Setting	Value
   Rule name	LAN-to-LAN
   Source zones	LAN
   Destination zones	LAN

4. Click Save.