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  • voice transmission using Wi-Fi in Ad hoc networking mode

    - by iam0hot
    We are looking to create Inter Vehicle communication system. So, a couple of vehicles should get connected automatically and could be able to share voice.. We decided to implement ad-hoc networking using Wi-Fi.. we are expecting it to cover a radius of 100 mts. If we could create a system like this.. and one of the user sends a voice information, does all people in the network get that ? What are the things we require to get this project done ?

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  • Virtual guest does not have network access in cafe.

    - by blee
    My Virtualbox guest OS (Ubuntu on ubuntu host) does not connect to the internet when I have wifi access through an internet cafe system. By this, I mean where your browser redirects to an internal web page where you can enter a code. On the guest, I can successfully connect to the virtual network adapter, but I do not get internet access, nor a redirect to the internal web page. I use OpenDNS for the host. I have no problems when connecting through ethernet or regular wifi. Can someone tell me any of: 1) How to fix the problem. 2) How such cafe systems work. 3) At least point me to a technical explanation of such a cafe system so I can begin to troubleshoot. Thanks!

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  • Stack-based keyboard delay using Logitech MX3100 keyboard

    - by Mark S. Rasmussen
    I've been using a Logitech Cordless Desktop MX3100 keyboard for quite a while. I've never really had any problems, except for the occasional typo. I noticed however that I tended make the typo "Laod" instead of "Load", quite a bit more often than any other typos. As it started to get on my nerves, I decided to do some testing. What I found out was than when I write lowercase "load", I'd never make the typo. All uppercase, or just uppercase L, I'd make the typo quite often. My actual (very scientific) testing is probably best described by showing the output: moatmoatmoat MoatMoatMoat loatloatloat LaotLaotLaot loafloafloaf LaofLaofLaof hoathoathoat HoatHoatHoat hoadhoadhoad HoadHoadHoad lortlortlort LrotLrotLrot What i found out was that whenever shift was depressed, typing an uppercase "L" would induce a significant lag if the next character was an "o", compared to the lag of the any other key: High "o" lag: LoLoLoLoLoLo No "a" lag: LaLaLaLaLaLa No lag for neither "o" nor "a": lolololololo lalalalalala By realizing this I regained a slight bit of sanity as I knew I wasn't coming down with a case of Parkinsons. I was actually typing correctly, the lag just interpreted it wrongly. Now, what really bugs me is that I can't fathom how this is occurring. What I'm actually typing, in physical order, is this: L - o - a - d, and yet, the "a" is output before the "o", even though "o" was pressed before "a". So while the keyboard is processing the "Lo" combo, the "a" gets prioritized and is inserted before the "o" is done processing, resulting in Laod instead of Load. And this only happens when typing "Lo", not when typing lowercase "lo". This problem could stem from the keyboard hardware, the receiver hardware or the keyboard software driver. No matter the fault location however, I can't imagine how this could be implemented as anything but a FIFO queue. A general delay, sure, I could live with that, albeit I'd be irritated. But a lag affecting different keys differently, and even resulting in unpredictable outcome - that just doesn't make any sense. I've solved the problem by just switching to a wired keyboard. I just can't shake it off me though; what kind of bug/error/scenario would result in a case like this? Edit: It's been suggested that I stop drinking Red Bull and stick to water instead. While that may actually help solve the issue, I'm really not looking for a solution as such. I'm more interested in an explanation of how this could happen, as I can't imagine any viable technical solution that could result in this behavior.

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  • Windows 7 : Any way to disable "show caracter" in WIFI network properties?!

    - by Fox
    Hi everyone, Here's my issue. I'm working in a school as IT Tech and I'm currently planning to roll out Windows 7 on students laptop. The issue is : When you go to the properties of a WIFI network, you have the fields to input the WIFI key, WPA2 key here in my case, and you also have a checkbox that allow you to "unmask" the caracters of the wifi key. This is actually the problem. Anyone who can access the WIFI network properties, will be able to see the WIFI key, which is really an issue in a school envrironnement where student are all eager to get the key for their precious IPod Touch, what I don't want to happen for obvious reasons... So, is there a way to disable that checkbox or else, make the field cleared out when the checkbox is checked, just like it was on Windows XP or Vista? Thanks all for your answer.

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  • openwrt uses a single interface bridge?

    - by timbo
    My understanding of bridging is that it ties together two interfaces at layer 2. I am looking at a Ubiquiti Nanostation2 running OpenWRT that has an ethernet port 'eth0' and a wifi port 'ath0'. The ethernet port (the 'wan' port) is not part of the bridge and the bridge is just a single interface. Can anyone clarify this? - seems very different to Ubuntu. /etc/config/network: config 'interface' 'loopback' option 'ifname' 'lo' option 'proto' 'static' option 'ipaddr' '127.0.0.1' option 'netmask' '255.0.0.0' config 'interface' 'wan' option 'ifname' 'eth0' option 'proto' 'dhcp' config 'interface' 'wifi' option 'ipaddr' '192.168.13.1' option 'type' 'bridge' option 'proto' 'static' option 'netmask' '255.255.255.0' option 'ifname' 'wifi0'

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  • Constructing radiotap header and ieee80211 header structures for packet injection

    - by hektor
    I am trying to communicate between two laptop machines using Wifi. The structure of the radiotap header and ieee80211 header I am using is: struct ieee80211_radiotap_header { unsigned char it_version; uint16_t it_len; uint32_t it_present; }; /* Structure for 80211 header */ struct ieee80211_hdr_3addr { uint16_t frame_ctl[2]; uint16_t duration_id; unsigned char addr1[ETH_ALEN]; unsigned char addr2[ETH_ALEN]; unsigned char addr3[ETH_ALEN]; uint16_t seq_ctl; }; struct packet { struct ieee80211_radiotap_header rtap_header; struct ieee80211_hdr_3addr iee802_header; unsigned char payload[30]; }; /* In main program */ struct packet mypacket; struct ieee80211_radiotap_header ratap_header; struct ieee80211_hdr_3addr iee802_header; unsigned char addr1[ETH_ALEN] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; /* broadcast address */ unsigned char addr2[ETH_ALEN] = {0x28,0xcf,0xda,0xde,0xd3,0xcc}; /* mac address of network card */ unsigned char addr3[ETH_ALEN] = {0xd8,0xc7,0xc8,0xd7,0x9f,0x21}; /* mac address of access point i am trying to connect to */ /* Radio tap header data */ ratap_header.it_version = 0x00; ratap_header.it_len = 0x07; ratap_header.it_present = (1 << IEEE80211_RADIOTAP_RATE); mypacket.rtap_header = ratap_header; /* ieee80211 header data */ iee802_header.frame_ctl[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_BEACON; iee802_header.frame_ctl[1] =IEEE80211_FC1_DIR_NODS; strcpy(iee802_header.addr1,addr1); strcpy(iee802_header.addr2,addr2); strcpy(iee802_header.addr3,addr3); iee802_header.seq_ctl = 0x1086; mypacket.iee802_header=iee802_header; /* Payload */ unsigned char payload[PACKET_LENGTH]="temp"; strcpy(mypacket.payload , payload); I am able to receive the packets when I test the transmission and reception on the same laptop. However I am not able to receive the packet transmitted on a different laptop. Wireshark does not show the packet as well. Can anyone point out the mistake I am making?

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  • Intermittent connection issues with atheros ar9285

    - by MrStatic
    I have an asus K50IJ which has an atheros ar9285 wifi chip. It has decided to start to randomly drop internet. Although the card doesn't seem to notice it has. It will show full signal instead of say 3 bars. I tried to look at the atheros site for the latest driver but they don't even offer driver downloads. I then checked the asus site and it doesn't even list that card in the downloads for this laptop. I run Windows 7 64bit. It will drop either every minute or once a day while I am doing intensive bandwidth usage and when I am just idling.

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  • Mac download speed keeps decreasing

    - by hatorade
    I have a Mac that is getting extremely low connection speed from my WiFi. The other 3 computers in this house have a fast connection. However, on this Mac, once I connect to WiFi it's fast, but as time goes on the speed decreases dramatically. I thought it was the browser or something (Safari) so I downloaded Firefox, but I have watched the download speed decrease consistently as time goes by and right now it's at 8kb/sec instead of the 60-200 range it started at. Any suggestions?

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  • Verizon HTC Eris - No sound on incoming phone call after 2.1 droid upgrade. Help!?

    - by Michael Rosario
    Has anyone had the following issue? I've had several issues as well: No sound when call connects, ringing or people talking. Apps would force close like weather. I did call HTC support and they had me go into Menu, Settings, Manage Applications and then clear the cache of the problem app. They also had me clear the cache once the browser was open and then do a soft reset (power off the phone and take the battery out for 15 seconds) This did fix some issues, but I am constantly turning my phone on and off to get sound back on call or to make the assigned ringtones work. There's no rhyme or reason as to why they stop working... Anyone else tried anything different??? Related problem statement... http://community.htc.com/na/htc-forums/android/f/32/p/2601/10344.aspx#10344 My wife and I are most concerned about the incoming call issue.

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  • What speed are Wi-Fi management and control frames sent at?

    - by Bryce Thomas
    There are a bunch of different 802.11 Wi-Fi standards, e.g. 802.11a, 802.11b, 802.11g, 802.11n etc. that all support different speeds. Wi-Fi frames are generally categorised as one of the following: Data frames - carry the actual application data Control frames - coordinate when its safe to send/reduce collisions Management frames - handle connection discovery/setup/tear down (e.g. AP discovery, association, disassociation) My question is about whether all these frames, and specifically management frames, are transmitted at the fastest supported speed available, or whether certain classes of frames are transmitted at some lowest common denominator speed. I have noticed that when I put an 802.11b/g only device into monitor mode and capture traffic over the air, I still see management frames (e.g. association/disassociation) being transmitted between my phone and AP which are both 802.11n, even though 802.11n has a higher transfer rate. So I am imagining one of two possibilities: My 802.11n phone/AP had to negotiate a slower speed for some reason and that's why I can see their frames on my 802.11b/g monitoring device. Management frames (and perhaps control frames also?) are sent at a lower speed, and it's only data frames that are transmitted faster with newer 802.11 standards. The reason I would like to know which one of these two possibilities (or perhaps a third possibility) is the case is that I want to capture management frames, and need to know whether using an 802.11b/g card is going to lead to me missing some frames sent at higher speeds than the monitoring card can observe. If management frames are indeed sent at a slower rate, then it's all good. If I just happen to be seeing the management frames because my phone/AP have negotiated a slower rate though, then I need to reconsider what card I use for packet capture.

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  • How can I auto-connect to a WPA2 Enterprise network?

    - by Demetri
    I would like my computer to automatically connect to a WPA2-Enterprise network as soon as it boots whenever the network is available, without any action needed by me. The computer already offers to connect, and even remembers the password, but I must still hit 'Enter' to connect. Also, connection does not occur if my login is at the terminal. I would like to automatically connect every time I login, no matter how I do so, unless a more preferred network is available. What is the best way to do this? I am running Fedora 19. A shell script that can be invoked at the terminal would be preferred. Connecting even if the Gnome-desktop has not launched is a must.

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  • How to use the AWUS036H on MacBook Pro with Lion and Backtrack in VM?

    - by Swader
    I have the AWUS036H USB WiFi adapter and have recently upgraded the OSX to Lion. The thing is, there are no drivers for Lion for the AWUS036H, and I would have to boot into 32bit mode every time I want to launch the adapter as per instructions here: http://www.youtube.com/watch?v=n9_HAGi1ce0 I also want to install BackTrack as I deal in networks a lot for my company. While this would be a simple matter on any other laptop, the company issued Macbook does not allow booting into any OS other than MacOSX or Windows with Bootcamp. Now, since dual booting into BT is not an option, I would like Backtrack to run in VM inside my MacOSX Lion - and this it does. It works like a charm inside VirtualBox. But since there are no 64bit drivers for the wifi adapter, Lion doesn't recognize it and cannot install it. This, in turn, means that Backtrack cannot see it even though AWUS036H usually works flawlessly with BT. How can I make my VM-based BT see the wifi adapter even if the parent OS doesn't see it, if at all? Is there a way, or am I better off buying a new WiFi adapter that supports OSX 10.7 such as the AWUS036NHR?

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  • Passive Scan using wpa_supplicant-0.7.3

    - by Ashish Yadav
    I am using wpa_supplicant-0.7.3 and WL12xx TI Driver(WiFi) . Looking into both code,I seen that both support passive scan . Also, nl80211 driver is used (not wext). I am not able to find any command for passive scan in wpa_cli . With iw , for passive scan we can use : iw dev wlan0 scan passive Similar I want to do passive scan using wpa_supplicant . So need help to know how to do passive scan using wpa_supplicant?

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  • Best way to transfer files across unstable LAN?

    - by JamesTheAwesomeDude
    This is very similar to Question 326211, but in this case, the LAN is an unstable Wi-Fi connection. I need to transfer about 11 GiB of files between two computers, both running Linux (although one may be rebooted into Windows.) Their connection is both slow and unstable (due to Linux's awful Wi-Fi support,) but removable media (such as a flash drive or external hard drive) is not an option at this time. Right now, I'm slowly transferring the files, one by one, across SFTP, but I have to reconnect each computer approximately every 90 seconds, and the computers are not very close to each other, so this is not feasible. This is not a duplicate of Question 30186; that one specifically concerns Windows 7, and all the proposed solutions involve closed-source, Windows-only programs (which are all spyware IMHO, and are all off the table even if I trusted them - one of the computers is Linux-only.)

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  • Cannot find the "Create Network" menuitem in the WiFi icon menu in Mountain Lion

    - by Chuancong
    I am using Mountain Lion Developer Preview 2. I cannot find the "Create Network" menuitem in the WiFi icon menu in the menubar. It was there before when I was using Lion. It started missing since I upgraded to Mountain Lion Developer Preview 1. By the way, is there any other method to create an ad-hoc WiFi network on OS X? I tried to use Internet Sharing via WiFi, but other devices using the shared connection could not find the Mac in their local networks. I am using an early 2011 MacBook Pro 15'. Thanks.

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  • One network, two macbooks, one is fast and the other is slow

    - by Brendan
    I really need help for my friend. I know next to nothing about computers. My roommate and I both have macbook pros from the same year running OS X, are both connecting wirelessly to the same xfinity wifi, and while mine runs perfectly fine, my roommate complains that his works very slowly and times out every few seconds. I can't seem to figure out why this is. He is trying to get me to switch internet providers because he is convinced that it is their problem, but this cannot possibly be the issue since it works great on mine. He has an xbox hooked up to the wifi that he says also works poorly. I really can't see switching providers given that I am experiencing absolutely zero problems. How can I help my friend?

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  • Macs don't connect to wifi access point but PCs will

    - by Josh
    So, as a side project I'm going to try and figure out why the wifi APs in my building exhibit the following behavior: - They typically allow all types of computers to connect without issues - Sometimes Apples can't get an IP address but will still connect to the AP's signal - Less often, PCs can't connect to the wifi (same as above - yes signal, no IP addy) - Don't let Raiders fans on no matter the time of day! My first thought was that the DHCP leases were all taken up when the Apples would try to connect, and it was just their unlucky timing, but I would then try to log on with a PC that had a new, unleased MAC address and it would work... Could this be something to do with interoperability between an apple wifi card, and the APs? Different parts of the DHCP lease being taken up first? The fact that the Seattle Mariners might actually be good this year?? If this hasn't used up everyone's patience (with my crappy sports jokes), something else I could use some help with: - We don't have the model or type of AP - This is because there is no documentation available for them, and they literally look like small white boxes with no writing on them. Also, the company that installed them is out of business, so the situation might be that no docs will ever be on the way. -- Do you guys have any ideas on how to figure out what we have? Thanks as always for all the help, and I'm looking forward to the day when I know enough to start contributing back to the site, Josh

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