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location Rio De Janeiro, Brazil
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visits member for 5 years, 5 months
seen Nov 25 at 10:49

May
13
comment Adding WiFi connection to a desktop PC
It might have plenty of speed headroom, but does it have enough power headroom? USB 2.0 power is quite limited, is it enough for 3x3 HT40?
May
13
comment External HDD connecting via USB disconnects wireless LAN connection
@Kensai: "How is this even possible?" If both are using the same power supply, very easily. Test with a separate wireless device (a battery-powered one like a laptop or smartphone) to see if it is wireless interference or some problem (power supply or some conflict) within the computer.
May
13
comment Why does Windows 7 assume there is a new network connection when connecting to an existing access point?
I saw a Windows Vista computer do that (add a " 2" to the name and ask for the location) when I changed the wireless router (keeping the same SSID, WPA2-PSK keys, and IP addresses). I thought it was very bizarre, but since it is Windows Vista, I let it slide.
May
13
comment Wi-fi Router Neighbor-Friendly Mode?
@zharvey: 3 20MHz channels. Or 4 if you are in a place which can use channels up to 13 (they are channels 1, 5, 9, 13 - the channels have a 5MHz spacing), but some devices cannot use channels 12 and 13, so people normally use only 3 20MHz channels and space them a bit more (channels 1, 6, 11).
May
12
comment Does it make sense that the lower a router is to the floor, the worse my reception?
There are several mistakes in this answer. For instance, you CAN combine signals from multiple antennas (maximal-ratio combining), and you can transmit on all antennas without making a phased array (else 802.11n MIMO would not work as well - there is a trick to avoid making a phased array, which 802.11n uses). Oh, and reflections are good for MIMO.
May
1
comment Using UDF on a USB flash drive
@romeovs: I did not partition the drive. That is the whole point of zeroing it, to remove the partition table and old filesystem leftovers and put the UDF filesystem in the whole unpartitioned drive. Creating a partition table would only risk confusing things.
Aug
29
comment How to see if USB stick has MBR?
Instead of all that dd dance, just use file -s /dev/sda.
Jul
20
comment What is USB root hub?
@Torpido: not 3 chips, but 3 cores within the same chip (probably the southbridge chip in your case). Yes, they look to the operating system as if they were 3 separate chips.
Mar
21
comment CSMA between APs in same channel & different SSID?
This answer is wrong on so many levels, I do not even know where to start. So, starting from the beginning: an AP will not see another AP as interference if they are near enough, since it can read the packet headers (and has to, else it cannot know they are for the other AP!). "They figure it out" is hopelessly vague. I do not believe anyone uses the frequency-hopping from the original 802.11 standard anymore. And the MAC layer is shared between all the stations (AP or not), after all it is its purpose to negotiate access to the media (MAC = Media Access Control).
Mar
21
comment What browser feature is this exploiting and how to stop it?
The problem with that tinyurl link is bugzilla.mozilla.org/show_bug.cgi?id=167475 (it uses several IFRAMEs with SRC="mailto:...")
Mar
21
comment What browser feature is this exploiting and how to stop it?
@John T: not if you temporarily allow Javascript on a page. When you do that, Flashblock takes over.
Jan
2
comment Using UDF on a USB flash drive
Related question: serverfault.com/questions/55089/…
Jan
2
comment Copying to MicroSD card from Ubuntu 9.04 Is slow
This is completely wrong. First, when using a USB reader (which is the case here), Linux is not talking the SD protocol, but the "USB storage" protocol, which is publicly documented (it is the card reader itself which implements the SD protocol). Second, the necessary documentation has been out for years (check commit 335eadf on the Linux kernel - it is from 2005).
Oct
16
comment Burnt SATA Drive
There are parts of the drive's electronics which are not in the PCB (the motors, the head, and often a small chip near the head). If any of these has burned, replacing the PCB will not be enough.
Oct
13
comment How to add support for wireless networking WPA2-PSK [AES] on Windows
Shouldn't it be Service Pack 3? (IIRC, you need either SP2+hotfix or SP3)
Sep
30
comment Ad-Hoc Wireless Network Connectivity
I did do my homework. I only forgot to explicitly mention that by "ad-hoc" most people mean an IBSS (since "ad-hoc" is what the user interface says in these cases), which indeed does no forwarding.
Sep
29
comment Automatically Connecting to Hidden SSID WiFi Network
Related blog post: blogs.technet.com/steriley/archive/2007/10/16/…
Sep
29
comment Should I Upgrade My Old Wireless Router?
@Ilari Kajaste: that page is from Nov 14, 2008 (look at the footer), there seems to be a newer exploit from 2009 for WPA: networkworld.com/news/2009/… (and yes, CCMP/AES is still safe).
Sep
29
comment Why is MAC-based authentication insecure?
Use WPA2, it seems WPA is also broken: networkworld.com/news/2009/…
Sep
29
comment What are the advantages of wireless networking protocols 802.11 a,b,g, and n?
802.11b is not dead; the 1, 2, 5.5, and 11 speeds of 802.11 b/g are all from 802.11b. And the beacons used by 802.11g are all at 1Mbps, so even a pure 802.11g network still needs 802.11b.