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hi all, i have a cisco 3661 router.when i telnet the router from win NT machine which itself is a DNS there is a problm .when i telnet using ip address it does so but when i telnet using the name assigned to it doesnot.i can see the name of the router when i run "show run".is there the problm in DNS or is it not possible to telnet using name? thanks

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There are two likely scenarios here

1) The name of the router does not have an “A” record in the DNS

2) The NT machine which serves as your DNS server is not using itself as a DNS server – check your TCP/IP configuration. Note: Just because a given machine (of any O/S) is running DNS does not mean that the machine automatically uses itself for that purpose.

3) The NT machine does not have the default search domain set to whatever is local or configured for the name of the router.


Discuss This Question: 6  Replies

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  • Airwrck
    Most likely, it is a DNS problem. On an NT machine, I believe there is an NSLOOKUP utility. If there is not, find one on the Internet. Use NSLOOKUP to see if your DNS server is resolving the name of your router to the IP address. If the router name is NOT entered in DNS, then no matter whether the host name is populated in the router or not, you will be unable to resolve the name - one reason why the IP address may be working but not the hostname. It is also possible that you need to use a fully qualified domain name (for example, instead of "router", "") in order for DNS to resolve the name properly.
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  • AROBob
    If you want to telnet using the router name, you will have to add it in the hosts file(C:WINNTsystem32driversetc) of the compuer you are using, you can add the line: "router address" "router_name" Now open a command prompt and enjoy the magic. If your hosts. For earlier versions of windows, you can find the hosts file under C:WINNTsystemdriversetc hope it helps. regards, Rob
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  • Mraslan
    Its a name resolution problem, and the solution is simple, just add an A record in the DNS server that maps the whatever name you want to assign to the router to its IP. i'm not sure of this, but i don't remember that there is a command in Cisco routers that makes them register themselves in thier configured DNS server, login to your router, go to globalb configuration mode and see all commands that start with "ip domain xxxxx" and "ip nameserver xxxx". if there is any command you will find them starting with one of the above. Using the HOSTS file in the %Windir%System32Driversetc has pros and cons, if you use it, you will have to use it on all computers which is a hard process, and if for any reason the name or IP changes, it will be like hell trying to go to all machines and update them, However if you will telneting to the router from a specific machine, then its better to use it and not to create a record in the DNS server for security reasons.
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  • Larrythethird
    One last consideration, routers don't get listed in WINS. Microsoft looks to the NetBIOS name in WINS to resolve names.
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  • Xevier
    hi,thanks to u all. so ultimately i could got it.i entered A-records for the routers and now m able to telnet them using name.But one thing i noticed while doing it is that some domains were not giving me option to add an A-record .they were giving only to add PTR or NS.why is it so.could anyone please suggest.
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  • Mraslan
    Domains like what? Are you using Windows Server 2003 DNS? if so you might be adding it to a stub domain, which will not allow you to add A records If you can give examples
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