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06/22/2009 at 02:12PM PDT, ID: 24512665
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8.2

Cisco Router DHCP problem

Asked by MrPrince in Network Routers, Dynamic Host Configuration Protocol (DHCP)

Tags: Cisco, Router, 871, DHCP

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
 
Keywords: Cisco Router DHCP problem
Title
1 Cisco 1100G multiple VLAN's
2 How to configure Cisco 3460 Route…
3 Public/Private Wireless Access Setup
 
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[+][-]06/22/09 07:52 PM, ID: 24688444

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[+][-]06/22/09 08:17 PM, ID: 24688520

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[+][-]06/23/09 11:20 PM, ID: 24698668

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[+][-]07/12/09 09:17 PM, ID: 24837099

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About this solution

Zones: Network Routers, Dynamic Host Configuration Protocol (DHCP)
Tags: Cisco, Router, 871, DHCP
Sign Up Now!
Solution Provided By: MrPrince
Participating Experts: 1
Solution Grade: A
 
 
 
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20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625