dhcp node cannot be seen

hi I have a windows 2008 standard dc/ad/dns/dhcp server

connected to layer 2 cisco 2950 using one 192.168.0.x /24 range and nothing else on a single vlan.

Ive added the following acl to my switches specifically for my 'line vty 0 4':

access-list 10 permit 192.168.0.15
access-list 10 permit 192.168.0.3
access-list 10 deny 192.168.0.0 0.0.0.255

I can telnet into each switch - successfully without problem

I have now plugged another win 2008 standard server into the same vtp server (primary) with a random static ip address which for some reason detected as for example: fileserver@itservices.local for example but I have not even joined this machine to the domain yet......anyway I have done the following:

master dc:

cleared and reconciled dhcp
dns - does not show any records for fileserver@itservices.local - which is to be expected
ipconfig /flushdns
rebooted master dc

fileserver
static ip address set & dns pointing to my master dc
ipconfig /flushdns
rebooted server

- both machines have had windows updates downloaded and installed already when in standalone mode.

- before I attempt to join the domain I wanted to resolve this dhcp issue not detecting my fileserver

- both master dc and current standalone fileserver can ping vice versa - successfully

question 1.  why doesn't my file server static ip at least get detected via dhcp ?
mikey250Asked:
Who is Participating?
 
giltjrCommented:
@ --< "I have now  plugged another win 2008 standard server into the same vtp server (primary) with a random static ip address"

Can you please explain what a "random static ip address" is?

I am going to assume you mean you configured the server with a static (meaning non-DHCP) address.  If this is correct then:

First,  the DHCP server will never "see" this host, because it has a static IP address.  DHCP servers only see hosts that have requested an address from it (the DHCP server).

Second, the IP address you chose  MUST be outside the DHCP scope you have assigned on the DHCP server .  

Last, if you want this hosts IP address  and name to appear in your DNS server, then when you configure the IP V4 properties  click on Advanced, then click on the DNS tab.  Near the bottom select "register this connection's address in DNS".  This assumes that you have a DNS server that support clients registering themselves, such as the MS DNS server included on Windows servers when running a Active Directory domain.
0
 
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
HI,

I couldn't understand your request!! could you please give more explanation?

Regards.

Salah
0
 
mikey250Author Commented:
my fileserver is not being detected via my dhcp.
0
Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

 
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Hi,

You have to joing the file server to the domain!

Regards.

Salah
0
 
mikey250Author Commented:
yes I know but the dhcp should at least detect the file server as a machine and only when I join the domain the master dc would create a dns resource record....or at least this is what it is with windows 2003.
0
 
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Hi,

How would you like that the DHCP will detect the machine and you configured the machine using static IP??

Regards.

Salah
0
 
mikey250Author Commented:
you can only join the domain if the 'rogue person' new the domain admin logon to logon otherwise he could not get access.  that being said as long as the cisco layer 2 or 3 switch was configured properly, such as using:

switchport port-security
switchport port-security maximum 1
switchport port-security violation shutdown - for example


then it would still be ok.

note: I was hoping that you would say that you have read somewhere that windows 2008/dhcp no longer detects the pc/server/node until joined to the domain, as I have not read that.
0
 
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Hi,

I get confused with your posts!! do you have NAC configured on the Switch??? please provide a drawing of your setup and explain what you did and what you want to reach as target!

Regards.

Salah
0
 
mikey250Author Commented:
question 1.  what is 'nac' ?

ok I am obviously being over complicated.

1 x vtp server switch:

- master dc/ad/dns/dhcp server
- fileserver - now joined to domain and dns record showing

1 x vtp access switch:

- win 7 - switch on - not joined to domain yet

issue: fileserver not detected in dhcp

target: I wish to see fileserver detected via dhcp!!
0
 
mikey250Author Commented:
hi,

a random static ip address, means an ip address that I have chosen to give as a static ip due to being a server and the desktop machines will be given ip address dynamically.

- dhcp range: 192.168.0.16 - 192.168.0.50

as my previous comments, my master dc \ad\dns\dhcp server & file server already have dns files in place
0
 
mikey250Author Commented:
let me point out when using windows 2003, all ip addresses were detected via dhcp when each machine was set to 'auto detect' and plugged into same switch on same network by default.  only if I then wanted that machine to join the domain would I then joined the pc/server to that domain.

I am not sure if windows 2008 has now put a 'stop to dhcp detecting all machines by default', in which case this is my problem as don't no why I do not see my machine in dhcp prior to joining the domain, as joining the domain is 'not a problem'.
0
 
Craig BeckCommented:
DHCP doesn't detect machines - it assigns addresses then stores the assignments in a database.  If a machine has a static IP the DHCP server doesn't have an assignment to store in the database for that machine.
0
 
giltjrCommented:
@ --> "let me point out when using windows 2003, all ip addresses were detected via dhcp when each machine was set to 'auto detect'"

That is true, that is because when you configure a machine to automatically get an IP address assigned, it sends out a special request that the DHCP server sees and responds to.  When you configure a machine with a static IP address ,no such request is send.

The DHCP server only sees machines that have requested an IP address through the DHCP (BOOTP) protocol.  It will NOT see a machine that has a static IP address configured on it.

If you want, you can do a DHCP reservation.  Get the MAC address of the server, configure the DHCP server so that when it see's that address it will assign a specific address to it, then configure the server to automatically get and IP address.  The server will then send out the BOOTP request for an address, the DHCP server will see it and respond with the one you have reserved for it.
0
 
mikey250Author Commented:
hi craig, ok, but why doesn't my win 7 machine get detected ?
0
 
giltjrCommented:
Is your Win 7 machine setup with a static IP address or is it configured to automatically get one?

It appears you have a single server that is your AD DC, DNS, and DHCP server.

So, when you say "detected by DHCP server", where exactly  on the server are you looking to see if something is "detected"?
0
 
mikey250Author Commented:
hi giltjr,

yes I understand about the 'reservation' as I already have my master dc set that way and can see it in dhcp.  so yes you are right.

I am not sure why but my win 7 desktop has now been detected in my dhcp, but this was because I forgot to remove the following:

access-list 10 deny x.x.x.x x.x.x.x

I cannot believe my eyes did not see it as the only other access-lists in place was specifically for my line vty connections so my eyes kept missing it.


so problem resolved
0
 
mikey250Author Commented:
I have 1 more question:

q1. as my desktop machine named: hr-desk-01 -  is now being auto detected via dhcp and allocated an ip address, but never yet joined to the domain, why does it show as a fqdn  ?

hr-desk-01.itservices.local
0
 
giltjrCommented:
A couple of possibilities.

On your Win 7 machine in the IP V4 configuration, in the advanced options under DNS tab you have domain name a domain name suffix coded and you have register in DNS checked.

Your DHCP server may be setup to automatically add your IP domain name to the end of any host name it adds to DNS.

What you need to realize is that technically the IP name space and the AD name space are two different name spaces, that when using integrated AD are the same name, but two different name spaces.  You can have hosts in your IP name space that are NOT members of the domain.
0
 
Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:
Hi,

in order to help you we neef to undetsand you well, but you ask a question related to system and when gided you jump to network and so on.

if you don't join the pc and server to the domain and both are in the same workgroup and netbios is enabled you will see both of t under network work please and this undependant of ip configured in static way or using dhcp.

please give more details regarding what you need to setup in order to guide you to the right way.

BR

Salah
0
 
compdigit44Commented:
ON the network properties of the Windows 7 clients is LLDP enabled?

http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol
0
 
mikey250Author Commented:
hi all my problem was resolved and mentioned on previous thread.

it was an access-list issue.

advice appreciated.
0
 
mikey250Author Commented:
even though my issue was an access-list problem on my switch which I eventually noticed and put this on a previous comment.  I will still allocate points to those with advice around the dhcp problem I thought I had.  advice appreciated.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.