Just take a wiff of that air!

OK, Seems I’m on a roll here with the HP 830 Wired-WLAN controller. Just looking things over and I see I can turn one of the radios on the MSM Access Point into a sniffer.

If you’re fighting wireless connectivity issues this could be a life saver.

In full disclosure: I will tell you that the HP 830 has a web interface but I’m from a planet far, far away and a long time ago. I’m old school so I opt for the command line. after all….question mark is my friend and yours too.

To use one of the radios as a sniffer, you will need to take it out of service. Let’s break it down:

1. If you have “Auto Ap” enabled, it will need to be temporarily disabled, use the undo wlan auto-ap enable command.

2. Change the view to the AP you want to use:
wlan ap ap01_0002 model 425-AM id 5 in this example ap01_0002 is the name of my access point.

3. Enter the radio view: radio 2

4. Disable the radio to change its settings: raido disable

5. Set the channel statically: channel 11 in this example 11 is the channel I statically assigned the radio.

6. Enable the radio: radio enable

7. Use the wlan capture start ap ap01_0002 radio 2 to get the sniffer started.


To verify the operation use the display wlan capture to see if it is running
WLAN Capture
AP Name        : ap01_0002
Radio          : 2
Radio Mode     : 802.11n(2.4GHz)
Channel        : 11
Capture Limit  : 10000
File Name      : CaptureRecord.dmp
Status         : Capturing

8. To stop the capture: wlan capture stop

From the pointed prompt enter the dir command. Talk about a throwback command…you should see a list of filenames. Look for the “.dmp” file.

Directory of cfa0:/

0     -rw-       298  Dec 06 2013 20:25:38   system.xml
1     -rw-       624  Apr 26 2013 19:23:42   wlan_ca_certificate.cer
2     -rw-      1800  Apr 26 2013 19:23:42   wlan_local_certificate.pfx
3     -rw-      3855  Dec 05 2013 20:49:08   startup.cfg
4     -rw-      2493  Sep 09 2013 22:24:30   basewc.cfg
5     -rw-      5449  Jul 09 2013 18:12:18   830-1-cfg.cfg
6     -rw-      1437  Jul 09 2013 18:15:58   default.cfg
7     -rw-      4610  Dec 06 2013 20:25:40   startup.cfg.old
8     -rw-       149  Jul 09 2013 20:23:12   apcfg.txt
9     -rw-      3075  Dec 05 2013 20:49:06   _startup_bak.cfg
10    -rw-   1199826  Dec 17 2013 20:49:36   capturerecord.dmp
11    -rw-  89019392  Sep 18 2013 08:36:46   hp830-cmw520-r3308p29.bin

1020068 KB total (865328 KB free)

File system type of cfa0: FAT32

Hook up a quick tftp server…something like 3cdaemon…and get it ready to receive a file.

9. Enter the tftp put capturedrecord.dmp command.This will copy the file to your PC.

Rename the filetype to “.cap” and open it with Wireshark.


DHCP server in times of need?

OK, say your working on getting the new HP 830 Unified Wired-WLAN controller up and running in a test lab. I know, you’re just like me and like to geek out in the lab…..wear it like a badge of honor. You happen to have the New HP 830 Unified Wired-WALN controller and some access points (MSM-430, MSM-460). The one thing you don’t have is a DHCP server handy in your lab. Fear not! One is closer than you think.

You see, the HP 830 controller actually has an embedded 8 or 24 port gigabit switch. IF you look at the command line for the switch you will see it has all kinds of features and functionality and one of them is a DHCP server.

When you establish a console connection to the controller you will be at the WLAN controller prompt…..<HP>…from this prompt you need to navigate to the prompt for the internal switch. How do you do this? I’m glad you asked. Use the very intuitive command…..oap connect slot 0.

You should now see an identical prompt to the one you were just at <HP>…..from here you can issue the system-view command to get to the [HP] (enabled mode) or CTRL+K to move back to the controller. Let’s stay on the switch prompt and use the system-view to get enabled.

Let’s take a quick peak at what it will take to get it running.

A quick look at the commands.

We start off with enabling the DHCP server. Next we specify the name of the server, I used swim2 with the EXTENDED option.
Specify the IP range and mask along with the gateway information. The forbidden IP addresses are optional.

Finally apply the ip-pool to the VLAN interface. In this example it is VLAN 100.

That’s it. You now have a quick and easy DHCP server to use for your LAB environment.