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19954
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5
Helpful
10
Replies

DHCP client cannot get an valid IP address

AngranYang
Level 1
Level 1

I have a problem with DHCP ip assigning.  I configured dhcp server on the router 2921 with 192.168.1.1/24 but the laptop is get invalid ip address of 169.254.x.x. The brand new laptop is running Windows 7 64bit. Here is a list what I tried:

- ipconfig /all got us a 169.254.x.x ip address and no default gateway

- ipconfig /release gave us the same number

- ipconfig /renew failed

- configure static IP address of 192.168.1.2 and it works

- pulled power cord out of router for 10 secs and pluged in agin.

- shut computer down, pulled network cable and restarted.

- ensured firewall was off

- went to start-run-services.msc and made sure DHCP service is started and automatic

- changed another computer and the problem was same.

- typed "show arp" command on the router, it couldn't see the laptop unless static ip (192.168.1.2) is set.

- typed "debug dhcp" command, configure the laptop to be dhcp, pulled out the network cable and pluged in, but no debug information was shown.

I looked up through the internet, and saw many people asking similar questions but didn't get a clear answer. This issue is discribed as APIPA - Automatic Private IP Addressing, which means the client cannot find any dhcp server any assigns itself a private IP. Combined with the debug information I drew conclution that the computer was not sending any dhcp request to the server, but I don't know why, nor how to fix it.

The config on the router and the topology is not complicated like I attached below. Anybody please help me cause I am really bothered by this issude. Many thanks in advance.

FULL config:

Building configuration...

Current configuration : 3147 bytes
!
version 15.0
service nagle
no service pad
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
no service dhcp
!
!
boot-start-marker
boot system flash0 c2900-universalk9-mz.SPA.150-1.M.bin
boot-end-marker
!
logging buffered 64000
logging console notifications
enable password 7 070C29454008540B191B595C547D
!
aaa new-model
!
!
aaa authentication login default line
!
!
!
!
!
aaa session-id common
clock timezone MET 1
clock summer-time MST recurring last Sun Mar 2:00 last Sun Oct 3:00
!
no ipv6 cef
ip source-route
ip cef
!
!
!
ip dhcp pool Customer_LAN
   network 192.168.1.0 255.255.255.0
   default-router 192.168.1.1
   dns-server 8.8.8.8
!
!
no ip bootp server
no ip domain lookup
multilink bundle-name authenticated
!
!
!
!
license udi pid CISCO2921/K9 sn FCZ160670C2
!
!
!        
!        
!
class-map match-any BESTEFFORT
match ip precedence 0
class-map match-any PREMIUM-MARKING
match access-group name PREMIUM-CLASSIFY
class-map match-any VOICE-MARKING
match access-group name VOICE-CLASSIFY
class-map match-any VOICE
match ip precedence 7
class-map match-any MULTIMEDIA-MARKING
match access-group name MULTIMEDIA-CLASSIFY
!
!
policy-map LAN-INCOMING-QOS-POLICY
class VOICE-MARKING
  set ip precedence 7
class class-default
  set ip precedence 0
policy-map WAN-OUTGOING-QOS-POLICY
class VOICE
    priority 896
class class-default
    bandwidth 1088
     random-detect
!
!
!
!
!
interface GigabitEthernet0/0
dampening
bandwidth 1984
ip address 192.168.6.2 255.255.255.252
carrier-delay msec 0
duplex full
speed 100
no cdp enable
max-reserved-bandwidth 100
service-policy output WAN-OUTGOING-QOS-POLICY
!
interface GigabitEthernet0/1
ip address 192.168.0.2 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
description CustomerLAN
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
no cdp enable
service-policy input LAN-INCOMING-QOS-POLICY
!
ip forward-protocol nd
!        
no ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 192.168.0.1
ip route 192.168.2.0 255.255.254.0 192.168.6.1
!
ip access-list extended MULTIMEDIA-CLASSIFY
remark Use this ACL for QoS Multimedia Classification
ip access-list extended PREMIUM-CLASSIFY
remark Use this ACL for QoS Premium Classification
ip access-list extended PREMIUM_2-CLASSIFY
remark Use this ACL for QoS Premium_2 Classification
ip access-list extended VOICE-CLASSIFY
remark Use this ACL for QoS Voice Classification
permit ip any any precedence network
!
!
!
!
control-plane
!
banner motd ^C
CPE  client
^C
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
session-timeout 60
exec-timeout 720 0
!
scheduler allocate 20000 1000
end

2 Accepted Solutions

Accepted Solutions

Hi.

The service dhcp must be enabled with the global configuration command:

service dhcp

Hope this helps.

Best regards.

Massimiliano.

View solution in original post

glen.grant
VIP Alumni
VIP Alumni

  If you are plugging the devices into a cisco switch make sure all access ports have the "switchport host"  command applied to them and then retry . Also fix this " no service dhcp " . 

View solution in original post

10 Replies 10

Hi.

The service dhcp must be enabled with the global configuration command:

service dhcp

Hope this helps.

Best regards.

Massimiliano.

Would you assign a static IP to the PC, verify that it works, and then post the output of show arp?

HTH

Rick

HTH

Rick

Thanks for the suggestion, I would try once the customer is back to work after weekend.

Yes, I have proved it will work after assigning a static IP to the PC. There will be 192.168.1.2 and a mac address on the output of show arp. If no static IP is set, this mac address won't be there.

It's a non cisco 8 port switch without any configuration. I don't know the model because I am remote controlling the router helping the customer with trouble shooting. I guess there should be no problem with the setting of switch.

Jeff Van Houten
Level 5
Level 5

What is the complete config and model of the switch?

Sent from Cisco Technical Support iPad App

It's a non cisco 8 port switch without any configuration. I don't know the model because I am remote controlling the router helping the customer with trouble shooting. I guess there should be no problem with the setting of switch.

glen.grant
VIP Alumni
VIP Alumni

  If you are plugging the devices into a cisco switch make sure all access ports have the "switchport host"  command applied to them and then retry . Also fix this " no service dhcp " . 

The switch is non cisco 8 ports with default setting, I guess the problem is probably this " no service dhcp ". I will try and let you know. Thanks.

amigomnemonik
Level 1
Level 1

Hi

Did you check the cable ?

Sent from my iPhone

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