Similar behavior will apply if your secondary DNS server also becomes unresponsive or rejects
queries, and you have specified a tertiary DNS server.
Note: Even if you have an upstream proxy (a proxy between the Web Appliance and the
internet) configured, you still need to configure the Web Appliance with access to your
organization’s DNS server.
4. Click Apply.
If your appliance is a Virtual Web Appliance or a Virtual Management Appliance there is the option
to Re-register a cloned virtual appliance. If you clone a virtual appliance, each cloned instance
must be re-registered before you can use it in live production mode.
Related concepts
Network Deployment on page 23
4.5.1.1 Configuring Advanced Settings
Additional IP routes enable the Sophos Web Appliance to process requests from client machines
with IP addresses that reside outside of the appliance’s subnet by re-routing the requests from
those IP ranges.
Note: The appliance uses 172.24.24.173 to run the Setup Wizard. If your local network also uses
addresses in the range of 172.24.24.0-255, adding an additional route that includes this address
will cause routing conflicts. Adding routes incorrectly can make the administrative web interface
inaccessible. See Adding Routes for more information.
■
To add a route:
a) Enter a descriptive Route Name.
b) Enter the requested Destination IP Range in CIDR format.
Important: This range must not include the static IP address of the appliance. It must also
be outside of the appliance’s subnet. Always enter URLs to numbered directories using
fully qualified domain names rather than IP addresses. The Web Appliance interprets any
dotted quad followed by a slash and a number less than 33 as a CIDR range.Thus, a URL
entered as an IP address followed by a numbered directory from 0 to 32 is improperly
treated as a CIDR range.
c) Enter the Gateway IP Address to which you want to route the IP addresses.This address
should be on the same subnet as the appliance
d) Click Add.
To modify a route, you must delete it and add it again with the modified route information.
Note: If a route makes the administrative web interface inaccessible, you must delete the
incorrect routes. Connect a laptop to the configuration port of the appliance and access
the appliance by connecting to 172.24.24.173.
■
To delete a route:
a) Select the check box beside the route that you want to delete.
b) Click Delete.
Sophos Web Appliance | Configuration | 149
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