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Showing posts from March, 2013

Memorise it..class C subnets

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
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Example, Add Cisco AP to a netwrork.

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...
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Powershell

I am only just getting to scratch the surface of Powershell's awesomeness as we only recently started rolling out Windows 7 to the enterprise.  More to come..... hopefully. This simple PS exports an AD report of users to CSV. https://gist.github.com/4108187
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Don't use the GUI, use Robo.

https://gist.github.com/4108167 I use this every week to copy files on WiFs shares internationally. Copy a directory and its contents verbosely (skipping items that exist in the destination, retry upon failure up to 3 times, wait 3 seconds between retries.) Great way to avoid GUI copy errors.
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