Archive for July, 2010

APC UPS Management Card Utility Not Working

Saturday, July 31st, 2010

I had the problem that the APC UPS Management Card Utility software used to configure the IP was not working. It detected the unconfigured card okay, and prompted for the settings but never took them. In the end I found a document from APC support that showed a workaround to get it configured. Note: you need to be configuring the device on the same subnet as the computer running the utility. However you can change the IP to whatever you want afterwards.

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How to configure Network Management Card 2 (AP9630)

  1. Install APC Device IP Configuration Wizard

  2. Open APC Device IP Configuration Wizard

  3. When NMC screen pops up (as below) then please write down MAC address.

  1. Open Command Prompt on Server (Start-> Run -> CMD)

  2. Enter the following command

    1. Arp<space>–s<space><IP Address><space><MAC Address>

  1. Type: ping <IP Address> -l 113 (This is a lower case L)

  2. If there is a reply, in Internet Explorer type: http://<IP Address>

  3. Configure Management Card as usual.

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ip helper-address Not working on Cisco 3750 Switch

Thursday, July 1st, 2010

I had a cisco 3750 switch that i wanted to enable some vlans for voice on, but only having one DHCP server on a completely seperate vlan to the voice vlans.

vlan 1 = data (dhcp server on this range)

vlan 266 = voice (phone dhcp clients on this range)

The switch for some reason had aload of dhcp server config on it before i started the exercise, so i removed the pools and ran the command: no service dhcp

This was the problem, running this command (no service dhcp) disables dhcp but also disables dhcp relay to, this stops the ip helper-address command from working too.

So even when i put the ip-helper address on the vlan as below it didn’t relay the dhcp broadcasts from the 266 vlan to the dhcp server on vlan 1.

interface Vlan266
 description *** VOIP-BBlock ***
 ip address 172.29.66.1 255.255.255.0
 ip helper-address 172.19.5.131

Where 172.19.5.131 is the DHCP server address.

Cisco Information Link

So to fix it, i ran the command: service dhcp

(making sure any dhcp pool configuration has been removed, and this fixed the problem)

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