[welcomb]

Just a thought when commenting on signal interference.

Is there any regulating body or law that governs the use of 802.11a/b/g/n freq?

What's to stop me from being evil and jamming all wireless channels in my area thereby artifically congesting or render useless all wireless networks in range?

[gratelemming]

No, there's no regulation over the 2.4GHz frequency band, which is why its possible for anyone to run their own wireless network without approval.

I'm not sure whether the Singapore infosec laws can be extended to classify this case as a DoS attack. However, in order to jam all the channels you'll need a lot of routers and really high transmit power. In which case you'll have more to worry about than the cops knocking at your door.

[liangtam]

There are some innocent looking consumer router which can do *ahem*. Then, there is also the iDA requirement of maximum 200mW EIRP for Wireless LAN output only.....

[welcomb]

I wasn't really thinking of having lots of routers. Basically have one high gain transmitter cycling through all the channels and transmitting the jam signal. All compliant hosts will go into exponential backoff, thus having congestion.

Though I think that it could be arguable as a DoS but I doubt any of your neighbours are smart enough to realise what's happening. heh

[gratelemming]

Ah I didn't consider using packets to cause congestion. Was thinking of using the physical signal to cause interference. Not sure if your method will work though since there's RTS/CTS to mitigate... sounds like you're trying to create an exposed node problem?

[&d00]

my router's radiated power incl 8dbi antenna is way above iDA limits.

but i stay on channel 14 (also off iDA limits) because of lower inteference for me and neighbours

[Evange]

I'm using a 10dBi antenna. Is that illegal???

[ktk]

Originally Posted by Evange

I'm using a 10dBi antenna. Is that illegal???

illegal no catch oso shake leg mah...

stupid laws IMHO.

[&d00]

it's illegal to use any antenna your device didn't come attached with actually.

FCC laws.

[jmmtn4aj]

The question is why?!

[&d00]

an increase in antenna gain means that it is no longer the one used for certification.

[&d00]

the device is also certified with the antenna it comes with, so changing it is against certification too.

[welcomb]

Originally Posted by jmmtn4aj

The question is why?!

Why jam channels? Ok that's just a theoretical proof-of-concept thing. Extending that idea, you could implement a non-compliant protocol that allows only you to transmit and congest everyone else. The current protocol dictates that everyone on the channel must be polite and give each others a chance. Your rogue network will be like having a rude person who talks all the time and doesn't give others a chance.

Further extending the idea, you could use 2 channels - one for upstream for your hosts to communicate to the access point, via normal protocol; the other for a continuous PPP-like downstream from your access point to your hosts. This signal could be continuously transmitted, inhibiting others from using the channel.

[&d00]

i occupied only 1 channel with my buffalo high-power, channel 14; nobody uses that channelas far as my network can reach.

additionally, the built in amp means i only use up a very narrow spectrum.

anyway when i microwave stuff, the throughput drops like mad.

plus this is NOTHING compared to the TOTAL DICKS using fake "wireless-N", which bonds CHANNEL 1, 6 AND 11 and FINISHES up the entire spectrum and uses a different protocol to support space-time division multiplexing.

THOSE are the assholes

[welcomb]

Originally Posted by &d00

plus this is NOTHING compared to the TOTAL DICKS using fake "wireless-N", which bonds CHANNEL 1, 6 AND 11 and FINISHES up the entire spectrum and uses a different protocol to support space-time division multiplexing.

THOSE are the assholes

haha... that's the kind of behaviour that I was referring to.

Anyway shouldn't your microwave be shielded?