Question

Cisco Router DHCP problem

Asked by: MrPrince

Hi,

Got a strange problem, Im using DHCP from a Cisco 871 router [12.4-(22)] on two different subnets. Im having a problem getting the correct DHCP information from VLAN 30 via a Linksys WAP54G AP. If I plug a client directly into fa2 then I get the right DHCP details from pool WPA2 but with an AP in the middle I get a default-router of 192.168.2.6 which is from WPA pool, the rest of the details are correct.

IE:

With AP I get

192.168.3.X
255.255.255.248
192.168.2.6

...Getting the wrong gateway.

Without AP I get

192.168.3.X
255.255.255.248
192.168.3.6

...Which is right.

Ive tried resetting the AP, swapping the other AP which is working and various combinations but each time no matter what i keep getting the wrong gateway for that network from DHCP.

Weird.

Below are the pertinent parts from my config.

Thanks.

-------------------------------------------------------------------

no ip dhcp use vrf connected
ip dhcp bootp ignore
ip dhcp excluded-address 192.168.2.5 192.168.2.6
ip dhcp excluded-address 192.168.3.5 192.168.3.6
!
ip dhcp pool WPA
   network 192.168.2.0 255.255.255.248
   default-router 192.168.2.6
   dns-server 64.59.114.18 64.59.114.19
   lease 0 5
!
ip dhcp pool WPA2
   network 192.168.3.0 255.255.255.248
   default-router 192.168.3.6
   dns-server 64.59.114.18 64.59.114.19
   lease 0 5
!
ip dhcp pool Static_Mappings
   origin file flash:/static_mappings.txt
!
interface FastEthernet1
 description <[-To Linksys WAP54G WPA-]>
 switchport access vlan 20
 duplex full
 speed 100
 spanning-tree portfast
!
interface FastEthernet2
 description <[-To Linksys WAP54G WPA2-]>
 switchport access vlan 30
 duplex full
 speed 100
 spanning-tree portfast
!
interface Vlan20
 description <[-WLAN0-]>
 ip address 192.168.2.6 255.255.255.248
 ip access-group WLAN_Outbound in
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip nbar protocol-discovery
 ip flow ingress
 ip flow egress
 ip nat inside
 ip inspect Global_Inspect in
 ip virtual-reassembly
!
interface Vlan30
 description <[-WLAN1-]>
 ip address 192.168.3.6 255.255.255.248
 ip access-group WLAN_Outbound in
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip nbar protocol-discovery
 ip flow ingress
 ip flow egress
 ip nat inside
 ip inspect Global_Inspect in
 ip virtual-reassembly

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Asked On
2009-06-22 at 14:12:07ID24512665
Tags

Cisco

,

Router

,

871

,

DHCP

Topics

Network Routers

,

Dynamic Host Configuration Protocol (DHCP)

Participating Experts
1
Points
0
Comments
4

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Answers

 

by: ludo_friendPosted on 2009-06-22 at 19:52:57ID: 24688444

whats in  flash:/static_mappings.txt ??

 

by: MrPrincePosted on 2009-06-22 at 20:17:38ID: 24688520

Static Bindings relating to PC clients. Auctal MAC addresses omitted.

*time* May 25 2009 03:30 PM
*version* 3
!IP Address -- Type -- MAC Address -- Lease expiration -- Device
!
192.168.2.1 /29 id 01xx.xxxx.xxxx.xx infinite
192.168.2.2 /29 id 01xx.xxxx.xxxx.xx infinite
192.168.2.3 /29 id 01xx.xxxx.xxxx.xx infinite
!
192.168.3.1 /29 id 01xx.xxxx.xxxx.xx infinite
192.168.3.2 /29 id 01xx.xxxx.xxxx.xx infinite
192.168.3.3 /29 id 01xx.xxxx.xxxx.xx infinite
!
*end*

 

by: MrPrincePosted on 2009-06-23 at 23:20:12ID: 24698668

Anyone?

 

by: MrPrincePosted on 2009-07-12 at 21:17:02ID: 24837099

So the problem was due to multiple networks in the Static_Mappings pool. When I separated them out with multiple pools then the problem was fixed.

20120131-EE-VQP-002

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