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New Member

Problem with DHCP across 1242G (WGB role)

Most of my WGB systems utilze old (EOL/EOS) Aironet 340 product. All work just swell. I have started deploying the 1242G AP/WGB systems and have a configuration problem. When a DHCP tries to acquire an address (or release/renew WinXP/Win7) it fails. If I use a static client IP address it is OK.

My WGB config should be (or I want it to be) a transparent bridge - passing any traffic that the client generates seamlessly across the cat5 Ethernet and spitting it out to the Wireless connection - it's access point.

Has anyone solved this problem. I have deployed over 6 of these and all of the configs are generally the same. None allow a DHCP client to work.

Help!

Below is basic info (not the config at this point) about the hardware:

Cisco IOS Software, C1240 Software (C1240-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)
Compiled Wed 16-Sep-09 19:06 by prod_rel_team

ROM: Bootstrap program is C1240 boot loader
BOOTLDR: C1240 Boot Loader (C1240-BOOT-M) Version 12.4(13d)JA, RELEASE SOFTWARE (fc2)

System image file is "flash:/c1240-k9w7-mx.124-21a.JA1/c1240-k9w7-mx.124-21a.JA1"

Part Number                          : 73-13785-01
PCA Assembly Number                  : 800-37050-01
PCA Revision Number                  : A0
PCB Serial Number                    : FOC1611361G
Top Assembly Part Number             : 800-29232-02

Top Revision Number                  : A0
Product/Model Number                 : AIR-AP1242AG-A-K9

Configuration register is 0xF

6 REPLIES

Re: Problem with DHCP across 1242G (WGB role)

Can you share the config if the 1242?

Steve

Sent from Cisco Technical Support iPhone App

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Problem with DHCP across 1242G (WGB role)

Yes - here we go:

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

version 12.4

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption

!

hostname badboy

!

enable secret

enable password

!

no aaa new-model

ip domain lookup source-interface FastEthernet0

ip domain name reallybigcompany.com

!

!

dot11 syslog

!

dot11 ssid TWD_ERP

   authentication open

   guest-mode

!

power inline negotiation prestandard source

!

!

bridge irb

!

!

interface Dot11Radio0

no ip address

no ip route-cache

!

encryption key 1 size 128bit 7 transmit-key

encryption mode wep mandatory

!

ssid AIREHEADE

!

antenna transmit right-a

antenna receive right-a

antenna gain 6

speed  basic-1.0 basic-2.0 basic-5.5 basic-11.0

station-role workgroup-bridge

arp timeout 300

bridge-group 1

bridge-group 1 spanning-disabled

!

interface Dot11Radio1

no ip address

no ip route-cache

shutdown

dfs band 3 block

channel dfs

station-role root

bridge-group 1

bridge-group 1 subscriber-loop-control

bridge-group 1 block-unknown-source

no bridge-group 1 source-learning

no bridge-group 1 unicast-flooding

bridge-group 1 spanning-disabled

!

interface FastEthernet0

no ip address

no ip route-cache

duplex auto

speed auto

bridge-group 1

bridge-group 1 spanning-disabled

!

interface BVI1

ip address 192.168.12.1 255.255.255.0

no ip route-cache

!

ip http server

no ip http secure-server

ip http help-path

http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag

bridge 1 route ip

!

!

!

line con 0

exec-timeout 10800 0

line vty 0 4

exec-timeout 10800 0

timeout login response 60

password 7 121314151617181910

login

line vty 5 15

exec-timeout 10800 0

timeout login response 60

password 7 121314151617181910

login

!

end

New Member

Re: Problem with DHCP across 1242G (WGB role)

... nice weekend and vacation before that...

Anyway - this is a reproducible real problem. If I can find the answer to this, I have a couple of other issues with these 1242G AP/WGB configurations, but this problem with DHCP working across the connection is bad.

New Member

Re: Problem with DHCP across 1242G (WGB role)

I know it's end of summer vacation time, schools starting... etc...

Anyone there? Hello... hello....... hllo........ hlo....... hl

I have dozens of WAPs and WGBs, but only these 1242G new ones are having this problem....

h e l p

Re: Problem with DHCP across 1242G (WGB role)

What is upstream, an IOS AP or a WLC? The config looks fine, except personally I'd move away from WEP.

Steve

Sent from Cisco Technical Support iPhone App

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Re: Problem with DHCP across 1242G (WGB role)

The upstream access points are all Cisco 1200. This specific problem is only happening when I have a newer 1242Gs as the work-group bridge. I use simple WEP because we still have about 1 dozen Aironet 350 series work group bridges. NO problems with DHCP from those attached clients (ack).

With this particular location (WGB), all the parents allowed are model AIR-AP1230B-A-K9. The same...

I have since changed a few configuration items - but it still exhibits the problem of the attached PC being unable to get a DHCP address. Another issue is from my mangagement PC on the same management IP subnet - I can't always ping it. Specifically I set the arp timeout to maximum. and the dot11 hold-off time to 5. Why age arps out at all because the attached clients (PC, Printer, etc) should never go down and I'm not worried about blocking a DOS where the hold-off time applies.

Here are the config additions (only):

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

dot11 ssid TWD_ERP

!

dot11 holdoff-time 5

!

ssid TWD_ERP

!

parent 1 000c.ceff.5061  <<-- AIR-AP1230B-A-K9

parent 2 000c.ceff.507d  <<-- AIR-AP1230B-A-K9

parent 3 000c.ceff.4d78  <<-- AIR-AP1230B-A-K9

parent 4 000c.ceff.4f7e   <<-- AIR-AP1230B-A-K9

!

arp timeout 2147483
-----------------------------------------------

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