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  • Are there any tests I can run on a network to simulate 100 heavy network users?

    - by marc.gayle
    I will be hosting a Ruby on Rails workshop at a small hotel in the near future, and while they have 'Wifi' everywhere on the property, and the property normally hosts 150 - 300 people, I am not 100% confident that they have hosted 150 tech people that tend to have heavy web surfing habits/needs. Their tech department is also 1 or 2 guys. Are there any automated tests I can download and run from my laptop, on the network, that would simulate 100 'heavy users' on the network at the same time? Their broadband pipe is a 15mbps cable connection. Would that suffice for the general surfing needs of 100 - 150 techies? I know all it takes is 1 or 2 bit torrenters to kill the entire network, but assuming we can at the very least block those ports or encourage the attendees not to file share on the network, would that speed suffice for general surfing needs? What are good resources online that would allow me to quickly get up to speed on the IT related issues, so that I can ask their sysadmins the right questions? Edit: Note that I am fairly technical, so assume I can get up to speed quickly even with technical manuals, etc.

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  • Trying to communicate between virtual servers on the same host through ipv6

    - by Daniele Testa
    I am running KVM on a host with 2 virtual servers. Each virtual server has a own bridge interface on the host VPS1 has br1 VPS2 has br2 Each virtual server has a own ipv4 and a ipv6. The virtual servers has no problem communicating with internet or with eachother through ipv4. However, with ipv6, they can only communicate with internet and NOT with eachother. The host can ping the 2 virtual servers without any problems, but they cannot ping eachother. iptables has been set to ACCEPT on all chains, so it is not the problem. VPS1 has ipv6 = 2a01:4f8:xxx:xxx::10 VPS2 has ipv6 = 2a01:4f8:xxx:xxx::5 the host has the following routes set: ip route add 2a01:4f8:xxx:xxx::10 dev br1 ip route add 2a01:4f8:xxx:xxx::5 dev br2 When I do a ping from VPS2 to VPS1, I see the following on the host: tcpdump -i br1 15:32:27.704404 IP6 2a01:4f8:xxx:xxx::10 > ff02::1:ff00:5: ICMP6, neighbor solicitation, who has 2a01:4f8:xxx:xxx::5, length 32 So it seems like the host is seeing the request coming from VPS1 on br1. But for some reason, it does not forward it to br2. Instead it is asking where the destination IP is through ipv6 multicast. Anyone has a clue what is going on? I find this very strange, as it is working fine with ipv4 with the exact same settings and routes.

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  • How can I remotely display images on my computer?

    - by Jakob
    What I Have: A laptop booted with Ubuntu and a stationary computer dual-booted with Ubuntu and Vista, both connected through a wireless ad-hoc network. What I Want: I want a way to display images in fullscreen on my stationary, using my laptop as a "remote control". I want to be able to choose another picture at any time and have my stationary computer remain in fullscreen mode at all times. Preferably, I should also be able to display just an empty (black) screen. How can I arrange for this? What I Have Tried: I have tried simply SSH:ing into my stationary computer and opening the image files using an image viewer, but all of the ones that I have tried (Eye of Gnome, Mirage, Gwenview, and others) open a new window for every new image. I don't know how to force them into using a single instance. I have tried using the VLC remote control command line interface, but apart from seeming somewhat unreliable (exiting with segmentation faults at one point), it also displays some images with a green border and forces me to pause playback in order for the image to remain on screen. Bonus Question: In my final setup, I also need to play music through my stationary computer's speaker and have the ability to switch to another track at any point, like with the images. Preferably, I would like to control the images and the audio through the same interface. How can I best achieve this?

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  • Unusable network, packet losses between router and NIC

    - by KáGé
    I have this setup: Gigabyte P35-DS3P motherboard Asus NX1101 PCI network card (the one on the motherboard got fried a few years ago by a power surge) Asus RT-N16 router Windows 7 x64 I think the other specs are irrelevant here, but I'll post them if you say so. Until a week ago everything was fine, but then my network became unusable: websites start loading but timeout before anything would come through (true for the web interface of the router as well), I can't reach the computer from my notebook and Windows' ping utility measures a ~50% packet loss between the computer and the router. Pinging localhost is good. The router works completely fine when wired to my notebook. I also tested different ports on the router, different cables, different router and connecting directly to the modem, but it's still the same. Sometimes it works for a few minutes right after turning on the machine, but then it becomes crap again, but mostly it's useless from the start. I've tried updating the firmware on the router, updating the driver for the network card (after which I started getting BSoDs in every 15 minutes), reinstalling Windows, swapping to Fedora 15 but none of them changed anything. Does this mean that the network card is dying, or could it be something else? If it's the card, what model do you recommend as a replacement? (Could be PCI or PCI-Ex x1) Thanks for your help.

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  • Hiding mapped drives for all users but letting programs access them

    - by AgainstClint
    What I'm looking for (and not sure if it's possible) is that we have 16 mapped network drives that are mapped when any user logs on, what I would like is to cut this down to just one visible drive yet leaving the other ones still usable to certain programs. I would just un-map them, however one of our constantly used programs writes to almost all of the drive letters so they need to be mapped for just that program, however they do not need to be visible to the user. Is this possible?

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  • saving and searching encrypted mail

    - by student
    I often send and receive gpg-encrypted mail. At the moment I use thunderbird + enigmail (in linux) to do that. As far as I know there is no way in thunderbird to find all encrypted messages which bodies contain particular keywords. There also seems to be no option to save encrypted mails decrypted (so they would be searchable). However for me it is important to be able to search old encrypted mails. So my question is: Is there a way in linux to save incoming mails automatically decrypted in my inbox and save outgoing encrypted mail decrypted in the send folder? Both times adding a line to the body which remarks that the mail was encrypted. It could be another email client for linux that could to that or perhaps a solution using procmail or maildrop. For a procmail solution I guess there could be some problems with encoding (perhaps one have to use emil?) the solution should work well with german special characters in subject and body. Note that the solution should work for multipart encrypted messages (including encrypted attachments) too i.e. with everything which could thunderbird + enigmail generate. Further note that I don't want a discussion about security holes. For me it's ok if messages are stored decrypted on my harddrive (which is encrypted as a whole anyway). In doubt for a first solution it would be ok to store my private key passphrase in cleartext on my harddrive, too. The point is that the mails are encrypted on the mailserver or more generally on their "way through the net".

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  • Web Development - How to access custom host, defined in my hosts file, from another device in the same network

    - by Neara
    Ok, I hope i'll be able to explain the issue im experiencing. I'm working on a project, that has 2 parts: one takes all requests from usual localhost, the other handles requests from myhost.local. While trying to access both addresses from my computer, it works ok. But now i need to test myhost.local on mobile devices, connected to the same network. Usually i would just run server from my computer ip in the network: python manage.py runserver 10.0.0.8:8000 And then from any device, going to 10.0.0.8:8000 would show the project im working on. However, now accessing that ip address routes me straight to localhost. So, my question is how to access myhost.local from another device in same network? I don't want to change router settings, if that can be avoided, cos sometimes i work from places where i can't access router admin. Is there any network settings on my computer, that i can change to fix the routing to myhost.local w.o losing access to localhost as well?

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  • A router that supports connecting with 2 different wifi networks

    - by Allan Deamon
    I Have the following setup in one place: We have a small local ISP through wireless. I have a external parabolic antenna, connected to a external usb wifi radio, connected through USB to a desktop old PC. The pc connects do the ISP wiki network, then do a Dial Up (PPPoE) connection through the this wifi setup. This will expand with others mobiles devices to be used. When I need, I take my home wireless router and connect though Ethernet in the PC, which is shares the internet. The problem is that the PC must be always ON and working. I would like to buy a wireless router which could be an AP to the mobile devices, notebooks, etc, as also could connect to the ISP Wifi/PPPoE network. So, this device must: Have one radio with detachable antenna to connect to the external antenna. It must connect as client to a network and then dial up the PPP Have another radio serving as AP (infrastructure) to the local place This can't be very expensive. I found a candidate: ( http://www.tp-link.com/en/products/details/?categoryid=1682&model=TL-WR2543ND ) It have 3 deatachable antennas, working with dual band. Officially, his firmware doesn't support it. My supposition: If internally there is 3 or 2 distinct wlan ports (like wlan0, wlan1), and there is support, i could use a OpenWRT, DD-WRT or Tomato to make this works. It also have 1 USB port, which I cold use to connect my actual USB Wifi card on it instead to the old PC. Another alternative, is a router that can do this out of box, with the original firmware. But I don't think this is a easy thing to find.

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  • Why does my microwave kill the Wi-Fi?

    - by Ohlin
    Every time I start the microwave in the kitchen, our home Wi-Fi stops working and all devices lose connection with our router! The kitchen and the Wi-Fi router are in opposite ends of the apartment but devices are being used a little here and there. We've been annoyed by the instability of the Wi-Fi for some time and it wasn't until recently we realized it was correlated to microwave usage. After some testing with having the microwave on and off we could narrow down the problem to only occurring when the router is in b/g/n mode and uses a set channel. If I change to b/g mode or set channel to auto then there is no problem any more...but still! The router is a Zyxel P-661HNU ("802.11n Wireless ADSL2+ 4-port Security Gateway" with latest firmware) and the microwave is made by Neff with an effect of 1000W (if this information might be useful to anyone). There is an "internet connection" light on the router and it doesn't go out when the interruption occurs so I think this is only an internal Wi-Fi issue. Now to my questions: What parts of the Wi-Fi can possibly be affected by the microwave usage? Frequency? Disturbances in the electrical system? How can setting Auto on channels make a difference? I thought the different channels were just some kind of separation system within the same frequency spectrum? Could this be a sign that the microwave is malfunctioning and slowly roasting us all at home? Is there any need to be worried? Since we were able to find router settings that cooperate well with our microwave's demand for attention, this question is mainly out of curiosity. But as most people out there...I just can't help the fact that I need to know how it's possible :-)

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  • Find slow network nodes between two data centers

    - by 2called-chaos
    I've got a problem with syncing big amount of data between two data centers. Both machines have got a gigabit connection and are not fully occupied but the fastest that I am able to get is something between 6 and 10 Mbit = not acceptable! Yesterday I made some traceroute which indicates huge load on a LEVEL3 router but the problem exists for weeks now and the high response time is gone (20ms instead of 300ms). How can I trace this to find the actual slow node? Thought about a traceroute with bigger packages but will this work? In addition this problem might not be related to one of our servers as there are much higher transmission rates to other servers or clients. Actually office = server is faster than server <= server! Any idea is appreciated ;) Update We actually use rsync over ssh to copy the files. As encryption tends to have more bottlenecks I tried a HTTP request but unfortunately it is just as slow. We have a SLA with one of the data centers. They said they already tried to change the routing because they say this is related to a cheap network where the traffic gets routed through. It is true that it will route through a "cheapnet" but only the other way around. Our direction goes through LEVEL3 and the other way goes through lambdanet (which they said is not a good network). If I got it right (I'm a network intermediate) they simulated a longer path to force routing through LEVEL3 and they announce LEVEL3 in the AS path. I basically want to know if they're right or they're just trying to abdicate their responsibility. The thing is that the problem exists in both directions (while different routes), so I think it is in the responsibility of our hoster. And honestly, I don't believe that there is a DC2DC connection which only can handle 600kb/s - 1,5 MB/s for weeks! The question is how to detect WHERE this bottleneck is

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  • Connect multiple WiFi networks simultaneously

    - by Tamir
    Hi all :-) I thought about connecting multiple WiFi networks simultaneously in order to leverage my bandwidth. I heared about "VirtualWifi" which is abandon by MS research. I have new Intel WiFi chipset (6200) and Win7 (64bit). Can I do such of thing somehow? Many thanks for your answers! Tamir

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  • My laptop can connect to every wireless network except fios

    - by going crazy
    I have always been able to connect to every wireless router secured or unsecured wep or wpa. I had Fios installed and could not connect. Verizon suggested it was my computer and gave me an outside wirless drive to use, it worked. I got rid of fios and went back to comcast and threw out the drive, but now 2 years later, I am sitting at my friends house haveing the same problem. My tech savy friend told me it is a firewall setting or something in my antivirus software, but I disabled them both and still nothing works........Funny it is only FIOS

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  • Connecting to same public IP from different locations yields different results

    - by DHall
    Since yesterday I've been unable to access one of my favorite time-wasting sites, boston.com. It starts to load but then it gets redirected to pagesinxt or something like that. After some investigation, I've narrowed it down to an issue with cache.boston.com, but only from my work location. I found the IP (216.38.160.107) , but even that doesn't work correctly from here at work. When I do a telnet 216.38.160.107 80 GET http://cache.boston.com/universal/css/hp_bgcom.css from another location, I get a nice long CSS, as expected. From here, I get an error (trimmed for size): HTTP/1.1 400 Bad Request Your request could not be processed. Request could not be handled This could be caused by a misconfiguration, or possibly a malformed request. For assistance, contact your network support team. Is there any way I can troubleshoot this further on my end? Tracert doesn't tell me anything too useful: Tracing route to vwrpx1.ttn.xpc-mii.net [216.38.160.107] over a maximum of 30 hops: 1 * * * Request timed out. Since it's not really work-related, I don't really want to bring it up to our network team unless I know what's going on, or if there's some risk to the network (ex. malware or something)

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  • Logitech MX3200 keyboard stopped working

    - by Roy Rico
    I have a Logitech MX3200 wireless keyboard and mouse set, and keyboard stopped working. I was working with it and it just stopped in the middle of using it. Some notes: The mouse still works flawlessly, i've tried to reconnect the KB i've tried to reconnect everything, mouse reconnects, keyboard reconnects (or pretends to) I've tried to hard reset (holding the connect button on the receiver for 10 seconds). I've tried new batteries I took out the batteries out of the KB & Mouse and unplugged the receiver over night. The media keys still work (launches winamp) but they main keys does not At this point, i've tried everything I've seen online. I just want to know is my keyboard dead in the water? I would say it's been about 8 months to a year since i've bought it, and the articles i find on the internet all say that's as long as they last... is this true? what's everyone's experience? I hope it's not true.

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  • Connecting to unsecured wireless network

    - by Sanchez
    I would like to know what information is public and can be intercepted in a non-open, but unsecured wireless network. Moreover, is there anything I can do to make it more "secure", other than using https connection whenever possible. In more details, I recently discovered (with surprise) that the wireless network in my school is actually unsecured. Although not everyone can connect to it (you need a student ID), I am told that certain softwares like Wireshark would be able to intercept the data. Since I have been using the network for all private purposes (email, facebook etc), I do feel quite insecure now and would like to understand the situation a bit better. I installed Wireshark and tried to play with it but all I can see are something alien to me. In any case, all I see seems to come directly/indirectly from my IP address, and I have long thought that usually different computers in the same wireless network would be assigned different addresses. Am I wrong? If not, then I feel very confused about what information is actually being captured (potentially by other users in the network, since I don't think I could capture activities of others in the same network anyway), and whether it's safe to use the network at all. (Gambling on others in the same network showing good behaviour is apparently not an option.) Thank you.

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  • Access points fighting for dominance?

    - by Phillip Oldham
    We have a small office with a large number of wireless devices (a mixture of desktop machines, laptops, and wifi-enabled phones) all working from a single Apple Airport Extreme which extends our wired network. I've added another Airport Extreme for resiliency, since we've been seeing a decrease in performance and (as far as I understand) access points can only handle a small number of clients. I set the new AP to extend the current network so that the clients weren't constantly switching between different wireless networks, however as soon as this AP was configured all the wireless devices started seeing network trouble, flicking on and off. I'm assuming that this is because both APs are reasonably strong, and the client can't decide which to use. What is the best route to follow to resolve this? What I'm aiming for is wireless resiliency; preferably having two APs share the network load, or if this isn't an option then having a primary AP with a "fail-over", should the primary go down for any reason.

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  • How to connect Android phone to a Wifi network using PPPoE?

    - by Slavo
    I have an ISP at home, which provides me with a PPPoE connection. My router supports that and I've configured it to autoconnect periodically, so I don't have to type my username and password each time. When I connect to the Wireless router from the PC, I have internet and everything works fine. However, when I do so using my Android phone, there's no internet connection on the phone. It connects to the router, but I cannot open any web page. How can I enable internet access from such an ISP on my phone? Is it something in the router setup? The router is Linksys WRT54GL.

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  • Measure Upload Speed between a client and our server

    - by tresstylez
    We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in particular UPLOADING documents through a form on our website. The client claims they have "bandwidth to spare" and that utilization of their "pipe" is so low that it MUST be our application, but our application has MANY clients and all features are working fine for all other clients. Interestingly enough -- DOWNLOADS (ie. just accessing the website, or downloading documents) is working fine. Speed test shows that they should get 1.2Mbps UP. So, a 3MB file should take 20 secs to upload. It takes 60+ seconds on their network. Sometimes even small files take OVER 10 minutes to upload or they timeout. Pings and Traceroutes don't show any abnormally long hops or response times. They claim other SAAS applications they use allow them to upload just fine. Both IT teams are working together to resolve this issue. What kind of data can I request from the clients to begin ruling things out. Seems like we need to somehow measure LATENCY of the networks involved or even at the switch level, we need to understand if packets are getting dropped somewhere and why. Where should I start? Any help is appreciated. I'll provide more info upon requests

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  • ADSL Modem/Router sometimes hands out incorrect IP addresses

    - by Peter Keevill
    My setup is as follows:- Main ADSL modem / router (switch) configured as DHCP server with address range 192.168.0.25-60 The office machines are configured with fixed IP ( not in the same address pool of course ) and hard wired to this router. A wireless access point ( Router ) is connected to provide Internet access for guests in a separate area. This router is NOT configured as a DHCP server. Wireless authentication is turned off. IP address lease times are set to 4 hours. Sometimes guests are able to connect to the wireless access point but they are not given a valid IP. They get 169.x.x.x addresses. Rebooting their machines does not resolve the problem. The only way to resolve is to reboot the main ADSL/router which is often frustrating for other users who are successfully connected with valid IP and DG. The problem seems to occur more frequently to Apple/Mac guests although it also sometimes occurs with Win machines. I personally use Ubuntu on my Laptop and thus far, never have had any problem connecting and getting a valid IP address in the guest area. One further point of note which may give a clue is that certain guests ( always Apple/Mac ) get lease times of 90 days. However, this does not 'stack out' the number of available addresses and of course, rebooting the router clears them until the next time they login.

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  • Laptop loses signal from WiFi router, but mobile phone holds it fine

    - by Anton
    I have an extremely weird issue with my WiFi router. Both Ubuntu & Windows 7 can connect to it fine, but after 5-10 minutes browser (any one) stops opening pages and tells me it cannot resolve host address. But, at the same time, tools like Skype or BitTorrent work without any issues. I can also browse Internet on my mobile phone connected to the very same router. If I reset router it helps, but after 5-10 minutes I see just the same problem... Ubuntu tells me that WiFi signal is lost (mobile sees it), Windows 7 just won't let me browse anywhere. Can anyone give me a suggestion on this, please? Thanks

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  • Router loses connection to internet randomly

    - by tvanover
    I have a Belkin wireless G plus Mimo router and it randomly loses the connection to the internet. It seems to happen for a second or two, not enough to impact day to day browsing. But enough to disconnect games, or stall videos I am watching. It happens whether I am plugged into the router or connecting via wifi. I am unsure if it is my router or Comcast that is causing this issue. If I connect a computer directly to the modem the problem never occurs, so that tells me it is probably the router. But I also had a Netgear wireless router WGR614, and it had the same problem. I don't know where to start looking for the source of the problem. What logs should I be combing through? All my machines are win 7 of varying versions.

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  • Colocation and HSRP setup

    - by WinkyWolly
    My colocation provider has setup HSRP for us and has provided us 2 drops (plugged into 1/1/1 and 1/1/2) from their routers as well as a /29 with 2 HSRP IP's and the rest of the /29 usable for the switch. I know that HSRP should be pretty much plug and play as long as the ports are in the same VLAN. However I'm confused as to how to the IP setup should work. Currently I've assigned port 1/1/1 the full /29 however I think this is incorrect because if I were to unplug it port 1/1/2 wouldn't work as it has no IP assignment. What's the proper way to do this?

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