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Determining the usefulness of some router entries

I'm currently providing App Support for DND in Canada and am trying to assess whether possible network performance issues exist in a wireless/Ethernet environment.

Could you advise me on what purpose a "name server" or "ntp server" entry would fulfill within a router's configuration, specifically, if time-based Access Lists are not being used. I'm presently unaware if DNS/WINS Services are required by the application at the moment. I do know that all connection parameters of the W2K Server/Windows CE client and devices (wireless) are established via static IPs. If these services are not required would it not be better to remove these entries from the router? How can I determine their usefulness and would the LACK of such entries "generally" impede routing performance in a typical Windows client-server environment?

In final, a current entry exists in one of our router configs which is identified as "ip name-server" - followed by appropriate IP addresses. Is this the correct syntax? I realize I have a few questions that require addressing but I would appreciate any help or advice I can get.
Thanks, Ron
Hi Ron,
If you have DNS servers on your network, I would suggest using that command. It will tell the router where to look for if it receives any query, which is based on name. Even to the extent if you ping router1.[your domain name] it should resolve and ping the right router.

If you are sure that you will never use names for querying than you can do away with that. To check, just use FQDN (router1.[your domain name]) of one of the routers to ping and see if you can get through. For a smaller network you can remember IP addresses but for an 800 router network it may be difficult.

The syntax is the same as you have noted.

As for the NTP is concerned it is to synchronize on network time. If it's 0845 GMT all routers should say the same time irrespective of the time-zone they are in. This has more of a management implication. If you want to reboot a router remotely at 0200 in the night, it can be done correctly if the routers are synchronized. If not, than that router can reboot a half an hour before or later. Time based access-list are not concerned with NTP as far as access is concerned. They just check the time range configured, derived from the router clock (synched if NTP is being used, local if it is not used) and grant access.

This was last published in May 2003

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