Eicon Networks SHIVA 1100, Administrator'S Manual, Page: 51 / 136

Packet filtering
System Administrator’s Guide 51
Addresses
This tab enables you to define the address aliases that must be created for any
internal server to map services to such as FTP, HTTP.
Any addresses that have already been defined will be displayed.
Click New to add a new address, or select an existing address and click Modify . There
is no need to add addresses for the Shiva VPN Gateway's interfaces, these are
predefined.
You can define an address using either the DNS hostname, or the IP address.
To define an address using the DNS hostname, enter the DNS hostname in the Name
field, and leave the IP Address field empty. The Shiva VPN Gateway will perform a
DNS lookup, and fill in the IP Address field. If the DNS hostname is invalid, you may
need to wait while the DNS lookup times out.
Warning: The DNS lookup is only performed once, when you enter it. If the IP
address corresponding to the DNS hostname ever changes, you will need to delete
the IP address to force the Shiva VPN Gateway to perform another DNS lookup.
This means that this option is not suitable for use with dynamic DNS.
Additionally, some DNS hostnames resolve to several IP addresses (e.g.
www.cnn.com). In this case, you must create an address entry and rule for each of
these IP addresses.
To define an address using the IP address, fill in the IP Address field. The Name field
is optional, and will only be used as a description of the address. Entering a description
will make the rules easier to read.