[c-nsp] 2 IOS DHCP Questions

[Jeff Wojciechowski]

I will check this out when I get caught up.

Thanks much,

-Jeff

From: arvindc.cisconsp cisco [mailto:arvindc.cisconsp at gmail.com]
Sent: Friday, August 06, 2010 6:04 PM
To: Jeff Wojciechowski
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 2 IOS DHCP Questions

1) AFAIK setting option 1 is not supported on Cisco routers.

That said, one workaround I could think of was to use the correct windows settings to disable NetBIOS over TCP/IP on the host stack http://support.microsoft.com/kb/313314

If you have a scaled setup, you could deploy this change using a group policy and push it out to all your clients assuming they are all a part of a single domain etc etc.

2) With a Windows DNS Server, the client "registers" by writing its address into the DNS file. With the Cisco router serving up addresses there is no such "file". You can either script out something that looks periodically at the routers show commands and inserts / deletes appropriate entries into the DNS server.

Take a look at Dynamic DNS http://www.cisco.com/en/US/docs/ios/12_3/12_3y/12_3ya8/gt_ddns.html to see if it fits your bill / requirements. (assuming your server supports DynamicDNS).

my 2c
Arvind

On Fri, Aug 6, 2010 at 4:52 PM, Jeff Wojciechowski <Jeff.Wojciechowski at midlandpaper.com<mailto:Jeff.Wojciechowski at midlandpaper.com>> wrote:
All:


1)      This one seems easy but not sure what I am doing wrong - I want to have my 2801 routers feed windows clients DHCP option 0001 with a value of 0x2 to disable NetBIOS using DHCP

a.       Tried several variations of "option 1 hex 0x00000002" in the dhcp pool config

b.      Error message I get back is "% DHCP does not allow raw option 1"

c.       (MS DHCP server says this option is for Win2k but if at all possible I want all NetBIOS gone so open to other ideas)

2)      I would like the same windows DHCP clients of the 2801 routers to "register in dns" with the dns servers they are learning via DHCP. When we ran centralized DHCP/DNS on the same 2008 servers, we had no issue with this. Now that DHCP resides on each local site on the router none of the pcs register in DNS.

Pool configuration for both above is:

ip dhcp pool 0
  network X.X.X.0 255.255.255.0
  default-router X.X.X.X
  dns-server X.X.X.X X.X.X.X
  domain-name *our domain name - just added this option this afternoon at my test site but haven't had anyone have time to reboot their pc yet

Router specs:
2801 running 12.4(22)T3

Thanks ahead of time for any and all insight...

Jeff


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