Install guide

Software Version 2.9.1 33
Software Version 2.9.1
C613-10486-00 REV C
Internet Protocol (IP) Enhancements
This Software Version includes the following enhancements to IP:
■ Dynamic DNS Client
■ Preventing MAC Address Resolution Between Hosts Within a Subnet
■ IP Debug Timeout
■ Show IP Interface Command Displays Gratuitous ARP Status
This section describes the enhancements. The new and modified commands to
implement them are described in Command Reference Updates.
Dynamic DNS Client
Software Version 2.9.1 enables you to configure the router as a dynamic DNS
client, for operation with the service offered by DynDNS (see
www.dyndns.com/services/dns/). This feature is available on AR400 Series
routers and AR750S, AR750S-DP, and AR770S routers.
The dynamic DNS client allows you to associate the router’s public IP address
with up to five “hostnames” (FQDNs) registered with DynDNS.com. When the
router’s public IP address changes, the dynamic DNS client sends an HTTP
update to DynDNS.com, notifying them of the address change. DynDNS.com
then associates the new IP address with your registered hostnames, and
propagates this change through the DNS system.
This means that you can host servers behind the router’s public IP address
without actually owning your own domain name, and even if your public IP
address changes periodically.
Configuring Dynamic DNS
To configure dynamic DNS, perform the following steps:
1. Register with DynDNS.com and select a domain name to use
2. Enable dynamic DNS, by using the command:
enable ddns
3. Specify the hostname, interface, username, and password for the client to
use, and other options if required, by using the command:
set ddns [server=server] [port=port] [user=userid]
[password=password] [dynamichost=hostnames]
[customhost=hostnames] [statichost=hostnames]
[primaryint=interface] [secondaryint=interface]
[wildcard={on|off|nochg}]
[mailexchanger={mailexchanger|nochg}]
[backmx={yes|no|nochg}] [offline={yes|no}]
4. Check that the client is correctly sending updates, by using the command:
show ddns
For a detailed step-by-step example and troubleshooting tips, see How To Use
Dynamic DNS To Allow You To Host Servers Behind A Dynamically-Assigned Public
IP Address. This How To Note is available in the Resource Center of the
Documentation and Tools CDROM for Software Version 2.9.1, or from
www.alliedtelesis.co.uk/site/solutions/techdocs.asp?area=howto.