User guide

Raven EDGE/GPRS for Cingular - User Guide, version 2.31 18

IP Manager and DNS

Configuring DNS

Generally, when your Raven receives its IP address from Cingular, it will also receive Cingular’s

DNS servers to use for resolving (or translating) names to IP addresses which it will automatically

configure in the modem settings. Unless your Raven will be used on a network with other modems

or devices which have names internal to the local network or frequently changing IP addresses, the

DNS servers provided by Cingular should be all you need.

If the Raven will be communicating with a device that

has a

domain name but changes its IP

address frequently (such as another AirLink modem using IP Manager) or is on a network where

devices are accessed by names rather than IP addresses, you will want to put in an alternate DNS

(*DNSUSER) where that domain is updated, such as the IP Manager server the remote modem is

using or the listing of IP addresses to names is kept.

FIGURE 2. Wireless Ace: DNS

*DNS1 and *DNS2 - The prim

ary and secondary DNS servers set by Cingular when your

Raven gets its IP address.

*DNSUSER - Set

this, if desired, to an additional DNS server to query first before the primary

or secondary (just as a hosts file is queried first on a computer). If *DNSUSER is set to 0.0.0.0,

it will be ignored.

*DNSUPDATE - This

command sets how often you want DNS Updates to be requested. Oth-

erwise the Raven will only send updates when it is reset, p

owered up, or the IP address is

granted by network changes.

PPP-Peer

Note: If you will be using your Raven to communicate with another AirLink

modem and both are using IP Manager to translate dynamic IP addresses to

domain names, it is recommended that you set *DNSUSER to the IP address for

IP Manager. IP Manager’s updates occur more frequently than Cingular’s DNS

servers decreasing the time between IP address change and address resolution.

Likewise, if your Raven routinely needs to contact another modem or device with

a Dynamic DNS domain and that modem or device frequently changes its IP

address, you may need to set *DNSUPDATE for frequent updates.

The Raven uses the unqualified domain name of “pp

-peer” when it is in PPP or SLIP address

mode to resolve the address of the device or computer connected via PPP or SLIP address. If the

Raven is not in PPP or SLIP address mode, “ppp-peer” will resolve to 0.0.0.0.