Metageek: InSSIDer and Chanalyzer
Notes:
- Includes neighboring networks on same channel
- Only one device can talk at the same time on the same channel
- Like a 4-year old; will repeat until acknowledged
Notes:
- Lower frequencies can pass through ‘stuff’ better than higher frequencies
Notes:
- 5 MHz of space between channels on 2.4 GHz
- Only three channels that don’t overlap (1, 6, 11)
Co-Channel interference:
- Compare to number of people at dinner table - politely speaking
- More people, less opportunity to talk
- Too many devices
Adjacent Channel Interference
- Dinner table at a restaurant - but you’re not the only ones
- People yelling and screaming over each other
- Noisy restaurant; ask people (i.e. devices) to repeat themselves
- Result is slower performance
- Ideal: If everyone only used 1, 6 and 11 that would eliminate adjacent channel interference
Wi-fi scanning:
- Doesn’t show how busy the channel is
- Also can’t see interference from non-wifi devices
Spectrum analysis gives a lot more information
Notes:
- Remember only one device can speak at a time per channel
- Non-Wifi interference spits out garbage and interferes with polite devices on network
- Devices will not have time to talk