another sysadmin blog

Here are the possible Class C subnets: | Bits | Mask | CIDR | Subnets | Hosts | | 0 | 255.255.255.0 | /24 | 1 | 254 | | 1 | 255.255.255.128 | /25 | 2 | 126 | | 2 | 255.255.255.192 | /26 | 4 | 62 | | 3 | 255.255.255.224 | /27 | 8 | 30 | | 4 | 255.255.255.240 | /28 | 16 | 14 | | 5 | 255.255.255.248 | /29 | 32 | 6 | | 6 | 255.255.255.252 | /30 | 64 | 2 | * Classless Inter-Domain Routing notation

I always set a scheduled reload of the remote device just-in-case there's a chance of breaking it (I'm still learning). 10 mins should give you enough time to implement your changes, test it and save it. Depending on the site and how many admins touch the device you could in theory leave your changes unsaved for a few days just to be sure, then get an onsite person to power cycle it if problems occur. reload in 10 config t # config the ssid and map it to a vlan, 1 per vlan. dot11 ssid YOUR_SSID vlan YOUR_VLAN authentication open  authentication key-management wpa wpa-psk ascii 0 YOUR_PASSWORD   # assign encryption to ssid interface Dot11Radio0 encryption vlan YOUR_VLAN mode ciphers aes-ccm ssid YOUR_SSID   # config the sub interfaces for dot11 radio and ethernet interface Dot11Radio0.YOUR_VLAN  encapsulation dot1Q YOUR_VLAN  no ip route-cache  bridge-group YOUR_VLAN  bridge-group YOUR_VLAN subscriber-loop-control  bridge-group YOUR_VLAN block-unkn...

Just some more network stuff to remember... https://gist.github.com/4108184

Download the 32bit driver here or the 64bit driver here  to be used with the PL2303 adapter that can be purchased cheap online. To initiate an console connection find your device: bash-3.2$ ls -la /dev/tty.* crw-rw-rw- 1 root wheel 18, 2 26 Oct 08:32 /dev/tty.Bluetooth-Modem crw-rw-rw- 1 root wheel 18, 0 26 Oct 08:32 /dev/tty.Bluetooth-PDA-Sync crw-rw-rw- 1 root wheel 18, 6 26 Oct 14:40 /dev/tty.PL2303-000013FA Execute: screen /dev/tty.PL2303-000013FA 9600 If it doesn't work for you uninstall it this way; kextunload /System/Library/Extensions/osx-pl2303.kext/ sudo rm -r /System/Library/Extensions/osx-pl2303.kext/ sudo rm -r /Library/Receipts/osx-pl2303.pkg

https://gist.github.com/4108157

A powerful tool to get familiar with in Windows 7....dism (Deployment Image Servicing and Management Technical) allows command line control of services, I do it via a DOS script. This is a nice one to start with so you have some tools to use with your Cisco infrastructure. dism /online /Enable-Feature /FeatureName:TelnetClient dism /online /Enable-Feature /FeatureName:TFTP

A simple one, don't do it often so thought I'd add it in a post so if I ever forget I know where to look. Theres two ways of doing it. Method 1, Using the config-register 0x2102 router> enable router# configure terminal router(config)# config-register 0x2102 router(config)# end router# write erase router# reload router# System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm] Method 2, Using the config-register 0x2142 router> enable router# configure terminal router(config)# config-register 0x2142 router(config)# end router# reload router# System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm] router> enable router# configure terminal router(config)# config-register 0x2102 router(config)# end router# write memory router# reload router# System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm] Note: the following configs are not reset to factory defaults using these met...