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  • Curious enigma of a network cable / connection / quality

    - by Foo Bar
    So, the situation is like this: I'm renting an apartment in a large house and I'm sharing internet with the landlord who lives downstairs. The internet is (in my best guess) optical 20/20Mbit. I don't know how it's all wired in his flat (haven't been there / seen it). Anyway, in my flat comes a cable which seems to be connected directly to the optic to ethernet router (and the password is the default one, so I have access, he he). There was a switch connected to that and to wires that go around the flat, and the wiring is terrible. It's even mixing phone and ethernet, and from what I see some cables are even interconnected!? Anyways, this cable that comes to my flat is very short. I can barely connect my computer on it, but if I do, I seem to get decent speed / performance. Not great, but decent. If, however, I connect switch to it (tried 2 different switches and a wifi switch) it's all blinking but I can't even connect to 192.168.1.1 (the router). DHCP fails, ping is losing 80-100% of replies. So I connected this cable directly to the other cable which goes to my work room, with a connector that has two female jacks and no electronics. Now when I connect my computer in my room, again, the performance is decent. When I connect WRT54GL (with tomato, DHCP disabled) to it and I plug a cable in this WRT and to my computer... the performance is gone. Download seems okay on Speedtest, but upload is .2Mbps and it's connecting forever. So what kind cable troll am I having here? Any ideas?

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  • windows: force user to use specific network adapter

    - by Chad
    I'm looking for a configuration/hack to force a particular application or all traffic from a particular user to use a specific NIC. I have an legacy client/server app that has a "security feature" that limits connections based on IP address. I'm trying to find a way to migrate this app to a terminal server environment. The simple solution is for the development team to update the code in the application, however in this case that's not an option. I was thinking I might be able to install VMware NIC's installed for each user on the terminal server and do some type of scripting to force that user account to use a specific NIC. Anybody have any ideas on this? EDIT 1: I think I have a hack to work around my specific problem, however I'd love to hear of a more elegant solution. I got lucky in that the software reads the server IP address out of a config file. So I'm going to have to make a config file for each user and make a customer programs files for each user. Then add a VMware NIC for each user and make each server IP address reside on a different subnet. That will force the traffic for a particular user to a particular IP address, however its really messy and all the VM NIC's will slow down the terminal server. I'll setup a proof of concept Monday and let the group know how it affects performance.

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  • consulting a network admin for rails and php applications

    - by Karo Devos
    Hi I'm a web developer who writes most of the time rails applications. Next month I'm going to switch from my current VPS to linode. I'm wondering how much it would cost to properly set (or teach me how to do it) everything to get my app up and running. My requirements are probably: nginx/apache, REE/ruby, passenger, full blown php environment, system wide RVM, search engine such a sphinx, being able to perform cronjobs. I have some knowledge of unix and I was able to install everything I needed on my development system. However I had quite a few issues setting up everything on my production server.

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  • Diagnosing Random Network Lag

    - by uesp
    I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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  • Best network tuning variables for a Linux proxy

    - by smarthall
    What are the best settings to tune so that Linux can handle a very large amount of TCP connections such as would be seen by a proxy server or a webserver? I'm using Centos6 and squid and am seeing a large amount of TIME_WAIT connections backing up until finally the machine stops responding. The machine isn't loaded at the time, and is having trouble making ingoing and outgoing connections. I've had several suggestions of tuning /proc/sys/net/ipv4/tcp_tw_reuse and /proc/sys/net/ipv4/tcp_tw_reuse but they mention bad interactions with load balancers and NAT both of which are used in my situation.

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  • Network Bridging on Linux for OpenVPN

    - by Coyote
    I've been following all the OpenVPN Bridge tutorials I can, but I'm still missing something. Does anyone know of a super detailed tutorial\explanation of bridging? If anyone has bridging running, can I get a copy of your interfaces file to see how you've got it going. (Obviously change the ip address, just please change them consistently.)

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  • Android: Problems downloading images and converting to bitmaps

    - by Mike
    Hi all, I am working on an application that downloads images from a url. The problem is that only some images are being correctly downloaded and others are not. First off, here is the problem code: public Bitmap downloadImage(String url) { HttpClient client = new DefaultHttpClient(); HttpResponse response = null; try { response = client.execute(new HttpGet(url)); } catch (ClientProtocolException cpe) { Log.i(LOG_FILE, "client protocol exception"); return null; } catch (IOException ioe) { Log.i(LOG_FILE, "IOE downloading image"); return null; } catch (Exception e) { Log.i(LOG_FILE, "Other exception downloading image"); return null; } // Convert images from stream to bitmap object try { Bitmap image = BitmapFactory.decodeStream(response.getEntity().getContent()); if(image==null) Log.i(LOG_FILE, "image conversion failed"); return image; } catch (Exception e) { Log.i(LOG_FILE, "Other exception while converting image"); return null; } } So what I have is a method that takes the url as a string argument and then downloads the image, converts the HttpResponse stream to a bitmap by means of the BitmapFactory.decodeStream method, and returns it. The problem is that when I am on a slow network connection (almost always 3G rather than Wi-Fi) some images are converted to null--not all of them, only some of them. Using a Wi-Fi connection works perfectly; all the images are downloaded and converted properly. Does anyone know why this is happening? Or better, how can I fix this? How would I even go about testing to determine the problem? Any help is awesome; thank you!

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  • Set web browser (or other program) to use specific network

    - by Will
    my PC is connected to 3 different networks: 2 different LAN connections and a VPN connection. when i am connected to the vpn, i cannot browse to the LAN intranet as the DNS is all going through the vpn and it cannot see the domains on the LAN. Is there a way to set firefox/chrome/etc to use a specific connection, so that i don't have to disconnect from vpn to get to the other intranets?

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  • Maximise network transfer speed of various applications

    - by Alex
    When using nc, scp, wget to transfer files between 2 machines on a dedicated 2Mbps link, I get speeds between 0.5 and 1 Mbps. However, when I use iperf -c 10.0.1.4 -t 20 -P 12 (for example) I can maximise the speed of the link (getting stable 2Mbps). Is there a way to make single stream transfers (such as those done by scp) to utilise all/most of the link? Some kind of tcp settings, or iptables...?

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  • Win XP cannot connect (or see) my wifi network, but can see others

    - by Jorre
    since yesterday I have a strange wifi problem with my pc. I have a wireless linksys router setup that worked fine for many months, now since yesterday my pc won't connect to the wifi signal anymore. The strange thing is, my macbook pro still connects fine. SSID is broadcasting, but my windows XP doens't see it, I have all signal modes set to "auto". Windows XP sees all my neighbours wifi networks, so the wifi card isn't broken or anything. Any idea what can be wrong here?

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  • All computers on network get stuck waiting for some sites indefinetely

    - by zacaj
    This happens across three computers, running windows 7 and Ubuntu, firefox, opera, and chrome (all latest versions). I am connected to the internet through a Verizon wireless usb modem. When I try to open some web pages they will never finish loading (and usually never even show anything). The status bar at the bottom of the browser will display "Waiting for X" The servers it gets stuck on include: platform.twitter.com s7.addthis.com connect.facebook.net ajax.googleapis.com 2mdn.net Ive been getting away with just blocking them in AdBlock up until now, however the last two have been causing problems. There are some sites which require googleapis.com to load correctly, and some that wont ever load unless its blocked. eBay requires access to 2mdn.net to load pictures. On top of this its getting really annoying having to update AdBlock across all these computers whenever a new site pops up. I'm hoping there's some easier way to fix this? The different sites causing the freeze indicate to me that it's either a problem on my end (somehow?) or some server side software that got updated with a new bug?

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  • Adding Exchange Multi Tenant to an existing Exchange Network

    - by TiernanO
    I currently have an Exchange 2010 SP1 server in house, and due to some changes, it looks like i will need Multi Tenant support for a few extra domain names. Looking at the documentation i have found so far, it only mentions multi tenant support when upgrading from 2010 RTM - SP1, and not what you do if you have already got 2010 SP1 installed. So, from what i can gather, i have a few options: Install a new Exchange server with Multi Tenant support and migrate DBs over Back everything up and start again Something else... Any suggestions would be greatly appreciated... Thanks.

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  • why only google related sites load using wireless network

    - by gansai
    I have a wireless internet connection through BSNL. I have a windows 7 ultimate, and using latest Google chrome. During night time ie from 12:30 am onwards till around 5:30 am, I have the following problem: Only the following webpages load: Google Search Google images and all related to google product pages like you see them on the google home page. Blogspot webpages as supported through Google. Any other site loading gets stuck with the status message:- Waiting for www.thaturl.com .... And it goes on and on. Why does this happen? I checked around googling for this but no solution at all. By the way I tried changing my dns addresses too sometimes from automatically to opendns and then Google public dns. I need some solution which might help me to load other websites also. Thanks in advance.

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  • small Windows network w/ printer issue

    - by user33666
    printer 1 connected to the desktop printer 2 connected to the same desktop that desktop is connected via Cat 5 to a wireless router a notebook is connected to that same router via WiFi The desktop Control Panel has just been reconfigured to share printers. (I assume this means that the desktop will now allow a notebook coming through the router to be able to access the two printers that are presently hooked up via the desktop--am I correct? Is that what it means?) The desktop can still print to either printer. It is presently okay. This notebook/printer relationship is a new configuration. The notebook, however, can't print at all (yet it can access the internet just fine). Any suggestions for it to be able to access the printers and be able to print via the desktop via the router? Thank you for any assistance.

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  • Monitoring VPN users on my network

    - by Fen0x
    My company runs filters on contents available for browsing and I have to check if everyone is respecting the browsing policies. Recently I have spotted some users activate OpenVPN on their workstations and i have discovered that they connect on port 443 of an external server and then use a proxy to circumvent the company filters. Is there any method to monitor VPN connections on allowed ports or to avoid the connections?

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  • Two routers network routing settings

    - by xiamx
    I have two routers, Router A is connected to the internet, and Router B is connected to the LAN port of Router A. Router A: 192.168.1.1 Subnet 255.255.255.0 Router B: IP leased from router A: 192.168.1.2 gateway 192.168.0.1 subnet 255.255.255.0 I have a machine C plugged to router A with ip 192.168.1.3 also a machine D plugged to router B with ip 192.168.0.199 I want to access machine D from a machine C. What settings do I need to change to do that?

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  • programs hangs during socket interaction

    - by herrturtur
    I have two programs, sendfile.py and recvfile.py that are supposed to interact to send a file across the network. They communicate over TCP sockets. The communication is supposed to go something like this: sender =====filename=====> receiver sender <===== 'ok' ======= receiver or sender <===== 'no' ======= receiver if ok: sender ====== file ======> receiver I've got The sender and receiver code is here: Sender: import sys from jmm_sockets import * if len(sys.argv) != 4: print "Usage:", sys.argv[0], "<host> <port> <filename>" sys.exit(1) s = getClientSocket(sys.argv[1], int(sys.argv[2])) try: f = open(sys.argv[3]) except IOError, msg: print "couldn't open file" sys.exit(1) # send filename s.send(sys.argv[3]) # receive 'ok' buffer = None response = str() while 1: buffer = s.recv(1) if buffer == '': break else: response = response + buffer if response == 'ok': print 'receiver acknowledged receipt of filename' # send file s.send(f.read()) elif response == 'no': print "receiver doesn't want the file" # cleanup f.close() s.close() Receiver: from jmm_sockets import * s = getServerSocket(None, 16001) conn, addr = s.accept() buffer = None filename = str() # receive filename while 1: buffer = conn.recv(1) if buffer == '': break else: filename = filename + buffer print "sender wants to send", filename, "is that ok?" user_choice = raw_input("ok/no: ") if user_choice == 'ok': # send ok conn.send('ok') #receive file data = str() while 1: buffer = conn.recv(1) if buffer=='': break else: data = data + buffer print data else: conn.send('no') conn.close() I'm sure I'm missing something here in the sorts of a deadlock, but don't know what it is.

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  • Remote I/O costs with a Content Delivery Network

    - by x711Li
    As far as I know, the time complexity of scanning a directory and the amount of files in said directory are correlated due to I/O costs. Would the administrative costs of placing the files in a hashed directory tree for uploading/downloading files through a CDN API be worth it for the added efficiency? For instance, given a filename foo.mp3, the MD5 hash for this is 10ebb1120767e9de166e0f5905077cb1. Thus, storing foo.mp3 in ./10/eb/foo.mp3 would allow for less files per directory (assuming MD5 generates patterns with in Base36, this allows for 36^2 root directories with 36^2 subdirectories each and little chance of hash collision) Considering the directories themselves are not loaded, would the I/O costs of directory scanning still exist with direct uploading/downloading?

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  • Cannot access internal website after being connected to other network

    - by Dandroid
    I have a client who claim they cannot access their internal website when they have e.g. been out traveling. They have to reset their browser settings every time to be able to get access again. As they live on another continent and timezone it's hard for me to run live tests with them to see what changes in their browser settings. My first guess would be it's some sort of Proxy related issue, but I want to know if there could be other reasons for this? It's not the LAN itself, that we are sure of. It's browser specific only. Edit It's worth mentioning that it only happens when they turn off/restart their computers.

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  • Can't access to access to my web server inside a network with Firewall on

    - by ianenri
    I set up a Web server with the following: There is the Internet Router, configured to Port Foward port 80 to my computer assigned to my PC's IP: 192.168.1.128 My PC is connected to that wireless router from wlan0 Then, my PC is also connected to my device (which is the webserver) with a crossover-cable usign eth0 having this anohter IP: 10.42.43.1 Finally, my device (the webserver) is connected with eth0 with this IP: 10.42.43.55 As you can see, I need to install a reverse-proxy to be able to resolve to my device's webserver. I installed pound (proxy server) in my PC and configured properly to make 192.168.1.128 resolve to 10.42.43.55 So, I just typing my ISP provided IP 200.x.x.x resolves to my device webserver. But there's a problem: I HAD TO STOP MY FIREWALL. I don't know how I need exactly configure the firewall in SUSE YAST2, or at least iptables. Stopping it is not an option, not for security reasons, just because there's port fowarding rule that is needed to give Internet access to my device too. I'm using openSUSE 12.1

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  • VMware Workstation 7&8&9 does not generate /etc/vmware/network upon installation

    - by dash17291
    When I install VMware Workstation on Arch linux Virtual ethernet is not working. $ sudo tail /var/log/vnetlib Aug 28 22:20:33 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:33 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:33 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:33 VNLNetCfgUnload - Requested cache is not loaded Database file is not present. Failed to initialize Aug 28 22:20:41 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:41 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:41 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:41 VNLNetCfgUnload - Requested cache is not loaded Required modules compiled. Previously I have copied that file or directory (I don't remember) from a working installation, but now I need a real solution. It's strange for me, may be a hardware issue also because with Ubuntu the same thing happens on the same computer.

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