Update apc-pdus.md

config/hardware/apc-pdus.md

@@ -21,11 +21,12 @@ The TCP/IP settings for the PDU may be configured using the following methods:
 
 1. Connect the PDU and the computer to the same VLAN.
 1. Check the status LED. It should be blinking green and/or orange to indicate that it has an invalid TCP/IP configuration and/or is trying to request BOOTP configuration, respectively. If it's solid green it means it's already configured.
+1. Find the MAC address of the PDU. Either read from the label on the device, or watch the DHCP server log for the VLAN for (failed) requests.
 1. Add a static ARP entry to the PC to bind the PDU's MAC address to the desired IPv4 address.
     - Windows: `arp -s 10.10.10.10 00-c0-b7-63-9f-67` (example)
     - Linux: `arp -s 10.10.10.10 00:c0:b7:63:9f:67` (example)
     - One way to find the MAC address may be to look in the DHCP server log for the VLAN.
-1. Ping the IP address with a packet size of 113 bytes.
+1. Ping the IP address with a packet size of 113 bytes to set the address on the PDU.
     - Windows: `ping 10.10.10.10 -l 113`
     - Linux: `ping 10.10.10.10 -s 113`
 1. Telnet into the device: `telnet 10.10.10.10`