tcpdump mailing list archives
Re: capturing on both interfaces simultaneously
From: Guy Harris <guy () alum mit edu>
Date: Mon, 12 Dec 2011 13:48:10 -0800
On Dec 12, 2011, at 1:10 PM, dragorn () durandal kismetwireless net wrote:
About the only time you'll see beacons on non-basic rates is a greenfield deployment, of which I've *never* found one in the wild despite all the manufacturers caring about it.
Will we see any greenfield deployments any time before the last 11b/11a/11g adapter is crushed/recycled? :-) (I guess you might get it in a corporate environment once every employee has been given a Shiny New 802.11n-capable {laptop, smartphone, tablet}, assuming they don't have to worry about vendors, customers, etc. not being able to connect *their* machines to the net.)
Also under linux you will need to tune explicitly to CH+ or CH- to get 40mhz data packets, they will be silently ignored on just CH. This means you must use netlink to set the channel as siochannel can't understand HT+ and HT-. I don't recall offhand if you'll still see basicrate packets on CH+ or CH- settings. Sniffing 11n in linux is a big mess.
Is that an issue of the Linux drivers? E.g., is it the driver, or the adapter, that's ignoring packets if you don't specifically tune to the upper or lower channel?- This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- Re: capturing on both interfaces simultaneously, (continued)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Gianluca Varenni (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously dragorn (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 15)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously David Laight (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously David Laight (Dec 13)
- Re: capturing on both interfaces simultaneously David Laight (Dec 13)
- Re: capturing on both interfaces simultaneously David Laight (Dec 13)