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  • Solution for file store needing large number of simultaneous connections

    - by Tennyson H
    So I'm fairly new to large-scale architectures. We're currently using linode instances for our project, but we're brainstorming about scaling. We need a file store system than can deliver ~50mb folders (user data) to our computing instances in a reasonable amount of time (<20 sec), and scale to 10000+ total users, and perhaps 100+ simultaneous transfers. We are also unsure whether to network mount (sshfs/nfs) or just do a full transfer store-instance at the beginning and rsync instance- store at the end. I've experimented with SSH-FS between our little Linode instances but it seems to be bottlenecked at 15mb/s total bandwith, which wouldn't do under 10+ transfer stress let alone scale v. large. I also tried to investigate NFS but couldn't get it working but have little hope that it'll do within our linode network. Are there tools on other cloud providers that match our needs? Should we be mounting, or should we be transferring? Thanks very much!

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  • Verizon overbilling me ?

    - by bek
    I have verizon air card for my internet. Which is called vz manager. I have had it for about a year. Keeping within my usage allowance the whole time until 3 months ago, when my bill came in my 5,000 g allowance was ran to 18,000. It has continued to do so through the last 3 months. My usage reset itself yesterday for the new month. I got on google for about 5 minutes and chatted for about an hour yesterday online. Mind you that I have never done anything any different then i do everyday. I do not download music or watch videos on my computer, nothing like that. Well since last night a 8 pm my usage sayd 1109.525 gb. ALREADY! For being on the internet for an hour with no downloads. What could be causing this, please thrown me some ideas. Verizon is checking on the problem, but that usually doesnt get me the answer i want. Can someone be hacking my card and using internet through it, has told me that that is not possible, however I think with the internet anytihng is possible.

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  • TCP handshake ok, then the client isn't receiving any packets from the server

    - by infgeoax
    Topology: Client ----- Intermediate Device ----- Server Client: win7 Intermediate Device: unknown Server: CentOS 5.8 The problem occurs when the client and server are trying to establish a SSL connection. It happens to one specific port, 2000. I haven't been able to replicate the problem with other port numbers. I captured packets on both client and server. After the TCP handshake, from the client's perspective, it's not receiving ACKs for its previously sent packets so it kept re-sending them. On the server side, however, it did receive those packets and sent ACK packets. The weird thing is, after the server sent those ACKs, it received a [RST, ACK] packet, from the intermediate device, for every packet it sent. What could be the cause?

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  • Cannot open /dev/rfcomm1 : Host is down

    - by srj0408
    I am working on raspberry PI and on Bluetooth. I am using old raspberry pi kernel as the new one has got some bugs that were not resolved with respect to the bluez daemon. At present my kernel version is 3.6.11. I am using a USB bluetooth dongle and my sole purpose is to auto connect the bluetooth dongle when ever it is in range. For that i think i have to run a script in the backend on RPI that will keep on checking the existence of usb bluetooth dongle. I started from the very scratch. I installed bluez daemon using apt-get install bluetooth bluez utils blueman and then i used hciconfig which gives me that my bluetooth usb dongle is working fine. But when i did hcitool scan , it give me no device in range even though my Serial bluetooth Device was on. I wasn't able to find any device in vicinity. Also when i unplugged and plug the USB dongle again, i was able to scan the serial device , but when i repeat the process, i find the earlier condition of not finding any deice. I had find another useful link, but that need address of the bluetooth device that need to be connected. I want to automate this using hcitool scan, storing the output to the a file and then comparing it with already paired devices and their name. For that i need to figure out why hcitool scan is sometime working and sometime not. ? Can some one help me in figuring out why this is happening. Is there any problem on hardware side i.e Bluetooth dongle is buggy or i had some problem in bluez utils. Edit 1: While as of now, hcitool scan is giving me my remote device address but still i am getting the same issue of HOUST IS DOWN, '/dev/rfcomm1'. I am really not getting any idea of what to be done.

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  • Computers on network crashing

    - by Phil Cross
    We have recently upgraded our network to Windows 7 clients with Windows server 2008 servers. The upgrade was completed by the end of September and until now has been fine (apart from the minor bugs). Recently (within the last 2 weeks) we've notice all computers on the network (around 1000) start to slow down to the point their unusable. It starts at about 08:45 and finishes at 09:15. Because of this, we think something may be broadcasting across the network. This happens every day, between these times. I cant use my computer at all at the slowdown peak, and looking at task managers performance graphs, Physical memory is hovering around 35% and CPU usage is at 0-10% (idle) yet still crashing. I've looked on DHCPs server log and cant see anything which stands out. The only change we made prior to the slowdown was installing adobe CS6 on some computers, however the slowdown affects computers without CS6. We have 2 physical machines, each with around 5-7 virtual machines running on them with ample memory. Does anyone have any suggestions as to what we can do to narrow down whats causing the crashes? Any help, suggestions or advice would be appreciated.

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  • Load-balance with LAN and Wi-Fi

    - by Synox
    I have a Mac, which runs Mac OS X 10.6 or Ubuntu 9.10 or Windows XP (Multiboot). Solution can be for any of the systems, whatever works better. I have two ISPs, one can be accessed via Wi-Fi, one can be accessed via LAN. In Mac OS X I can define the priority, which network to choose first. But what I wish to do is to load-balance with both networks. I don't want to buy extra hardware. I have some unused Wi-Fi routers if this would help. Compiling and configuring programs in Linux is no problem for me. Similar question: Load balancing with multiple gateways

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  • Internet keeps connecting and disconnecting

    - by OmerPT
    I have a PC running 32bit Windows 7 Professional. My wireless internet card is Edimax EW-7128G, it is inside my computer case and it is connected to an antenna. My problem is: I have a wireless connection to my router, the signal is fine and it's not slow or anything, but it just keeps disconnecting every 30 seconds or so, then connects back, then it disconnects, then connects back and so on. This is new - it only started about a week ago, everything worked just fine until then. I know it's not a problem with the router because: Other computers can connect to it easily and they work just fine, no disconnections (My phone too). I know it's not a problem with the computer or the wireless card itself because: I have Ubuntu installed side-by-side with my Windows, and when I switch to Ubuntu the internet works great. This caused me to think it's probably a problem with the wireless card drivers installed on windows (Ubuntu auto-installed them, I installed them manually on windows): I tried uninstalling them, and then installing them back again, sadly that didn't help. I'm kind of lost here - can anyone think of anything else I should try? Thanks :)

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  • Windows Sharing requires password

    - by Linux Intel
    I have 3 machines on my local network Machine A , Machine B and Machine C OS on all machines is : Windows 7 64bit. Sharing Permissions on all machines : Everyone ( Read/Write ) no domain. Sharing folder name : project Machine A is sharing folder over the network without password. Machine B is sharing folder over the network without password. Machine C is sharing folder over the network without password. Machine A can normally access B and C without password required. Machine B can normally access A and C without password required Machine C can normally access Machine B without password. My problem is *Machine C* requires a password when it access Machine A also the shared folder in Machine A don't have password protected and Machine B can access Machine A without a password ! How can i solve the problem .?

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  • Ubuntu Wired network(ethernet does not work)

    - by badnaam
    It was working just fine, until the other day I yanked it out. The wireless works just fine on the same router. If I login to a windows 7 instance on this dual boot laptop then the ehternet works just fine. So it's not a hardware, cable or router issue. The card even gets an ip, but I can't connect to the internet. Here are the details from route, iptables, ifconfig, ping etc. Any ideas? I have been struggling with this for day, none seems to have an answer. http://pastie.org/954816

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  • Hosting solution for startup social app?

    - by happyhardik
    We are in a process of building up a social app. Initially we will have only a few thousands of users than will grow with time. Which would be the best and suitable hosting for this purpose? Grid, cloud or VPS? (it has to be economic, as we are just starting up) The hosting needs to be strong, so, in case our app has increase in the user base all of a sudden it wont break up or slow down the app. Our app is in PHP, MySQL. Sorry, if question posted in wrong place. Thanks, for your time. :)

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  • Not able to connect to port 80 using telnet?

    - by pranitkothari
    When I try to connect my Windows PC with telnet, its giving me following error. Welcome to Microsoft Telnet Client Escape Character is 'CTRL+]' Microsoft Telnet open 192.168.220.135 80 Connecting To 192.168.220.135...Could not open connection to the host, on port 8 0: Connect failed Microsoft Telnet I have firewall off for both the machines. Can you please suggest how to connect to port 80 using telnet. Thanks.

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  • Internet Connectivity... Help please!

    - by James
    Hi. My Laptop is having trouble connecting to my wireless router. Other laptops are using the wireless, but it's not reached capacity. The laptop recognises (with a strong signal) that there is wireless internet, and I can connect via the router with a cable because this happens automatically. My problem is this... When I click "connect" (for example in the network and sharing centre), the dialogue box closes and nothing else happens - as though "connect" is being read as "exit". I am running Vista on a Toshiba Satellite Pro P300. Any help would be very much appreciated, Thanks

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  • hosting website on a private network

    - by razor
    i'm currently running a website off 3 linux servers. I'd like to setup a private network and only allow port 80 traffic to one of the servers. I'd also like to setup a vpn so only I can access the servers via ssh or any port for developing/debugging. How hard is this to setup and what do I need to get? Do enterprise/commercial routers have vpn functionality built in? how do I handle DNS? eg- www.mydomain.com would need to point to the router, which forwards traffic to the webserver. Do I set the A record to the router, and somehow tell the router which server to send the http request to? And how would I make server1.mydomain.com resolve to server1 within the private network (without editing host files)? Would I need to run my own DNS (eg- powerdns?) to do this?

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  • Central Storage for windows user accounts homedirs .. hardware/software needed?

    - by mtkoan
    We have ~120+ users in our network, and are endeavoring to centralize logon authentication and home directory storage server-side. Most of the users are Windows 2000/XP machines, and a few running Mac OS X. Ideally the solution will be open-source-- can this all be managed from a Linux server running LDAP and Samba? Or would a hacked-NAS Box with a FreeNAS or similar suffice? Or is Micro$oft's Active Directory really the preference here. Is it viable to store PST files on this server for users to read from and write to? They are very large ~1.5gb. We have no mail server (or money) capable of Exchange or IMAP, only an old POP3. What kind of hardware horsepower and network architecture should we have for this kind of thing?

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  • A really unique case of Load Balancing

    - by Shamshun
    I have an internet connection which has limited up/down bandwidth per IP address. What I want to do is to get multiple IP addresses on a "single" LAN interface, and use a load balancer to distribute traffic through them. I was successful at getting 100 ip addresses on a single interface. my problem is that Linux and Windows use the first ip address of an interface by default, so my bandwidth is not increased. I would appreciate if someone tells me what Load Balancing software has the ability to distribute load between multiple IPs on a single interface. I have tried to do so on both Win7 and Backtrack-LinuxR2

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  • Wireless connection silently dies randomly

    - by Force Flow
    I have two WAP4410N wireless access points powered using Power-Over-Ethernet. They are both connected to the same LAN and broadcasting the same SSID with a WPA2 password. One is using channel 1, while the other is using channel 11. There is coverage overlap where the signal from both access points hover around -75db to -85db while standing in the same physical location. DHCP is disabled, and is being provided by another network device. Every day or so, devices can connect and authenticate to the access points, but are not granted an IP address (and subsequently are unable access to the LAN or Internet). For devices that had already retrieved an IP address prior to the issue exhibiting itself, the devices simply stop communicating with LAN and Internet. However, I can still access each access point's web admin interface from the LAN. If I reboot both devices, the problem vanishes and devices are once again able to get an IP address and connect to the LAN and Internet. Are these symptoms of signal interference between the two WAPs or is this a completely different issue?

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  • Is it possible to combine a list of torrents into one torrent with many files, keeping the seeds?

    - by Zequez
    Let's say you have all the episodes of FOO series that you downloaded as they were out, so you have like 20 torrents. Now let's say you want to make a bundle torrent with all the files, call it "FOO Season 1", and then send it to someone. One way would be to create a new torrent with all the episodes, but you would lose all the seeds from the current torrents, and you also couldn't seed people that want to download single episodes. Is this possible with the BitTorrent protocol?

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  • how to throttle http requests on a linux machine?

    - by hooraygradschool
    EDIT: here is the summery: i need to reduce max connections preferably system wide on Ubuntu 11.04 but at least within Google Chrome. i do not need or want to throttle bandwidth, Verizon seems to only care about the number of connections so that is all i want to change. also, i don't want to use firefox unless i have to, i have three other machines all using chrome and synced and i just prefer it over firefox. i use tethering for my home internet connection via my verizon cell phone. without paying for it. this works just fine for streaming netflix via my nintendo wii and pretty much every other conceivable use ive had for it. except, during heavy usage with multiple tabs open on my laptop, the network connection on my phone will just turn off, then on again, then off, but it never fully connects. i think, based on this and other questions that this is caused by verizon getting too many http requests from my phone. is there some software, script, setting or otherwise that would allow me to throttle my requests to say, 5 or 10 or whatever it turns out is 1 less than verizon is looking for, so that my cell's network connection is not lost? i would far prefer a slow down rather than complete shut off of my internet connection. i am almost certain is from quantity of requests and not related to data, because, as i mentioned, netflix will run all day without a hitch, and that uses more data than anything else i would be doing. if i had a router i am pretty sure there are settings i could easily change to only allow so many requests at a time ... but in this case, my phone is my router, so no settings. im using ubuntu 11.04 on my netbook with an htc incredible on verizon (not that the phone details are relevant) i have been trying to figure this out for quite some time, currently the only fix is ensure that all requests are stopped and then sometimes it works again, other times i have to manually turn my 3g service off and then back on. thank you so much for any assistance!

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  • Can't reach only certain websites from my Wifi (with macbook and iphone)

    - by mellin
    I can't access certain websites neither from my macbook nor from my iphone when connected to my Wifi. The same website can be opened from another windows computer connected to the same Wifi. This is what happens when I try to ping it: PING ilpost.it (151.1.175.113): 56 data bytes Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 ... And when I try to traceroute it: host-001:~ j$ traceroute www.ilpost.it traceroute to ilpost.it (151.1.175.113), 64 hops max, 52 byte packets 1 vodafonedslrouter (192.168.1.1) 2.965 ms 0.743 ms 0.745 ms 2 * 2.96.54.77.rev.vodafone.pt (77.54.96.2) 12.076 ms 10.871 ms 3 77.41.30.213.rev.vodafone.pt (213.30.41.77) 14.145 ms 10.693 ms 11.960 ms 4 85.205.11.49 (85.205.11.49) 9.658 ms 8.946 ms 9.085 ms 5 85.205.13.105 (85.205.13.105) 57.497 ms 57.621 ms 48.080 ms 6 188.111.129.17 (188.111.129.17) 49.483 ms 51.338 ms 48.852 ms 7 85.205.25.174 (85.205.25.174) 47.891 ms 49.219 ms 47.821 ms 8 * * * 9 * * * 10 * * * 11 * * * I've flushed my DNS cache but nothing changed. This is quite dramatic as it seems to depend on 85.205.25.174 hop and don't know how to avoid it. Any suggestions? I add that 3 days ago everything worked fine. Then it has stopped.

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  • Can't reach only certain websites from my Wifi (with macbook and iphone)

    - by trampj
    I can't access certain websites neither from my macbook nor from my iphone when connected to my Wifi. The same website can be opened from another windows computer connected to the same Wifi. This is what happens when I try to ping it: PING ilpost.it (151.1.175.113): 56 data bytes Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 ... And when I try to traceroute it: host-001:~ j$ traceroute www.ilpost.it traceroute to ilpost.it (151.1.175.113), 64 hops max, 52 byte packets 1 vodafonedslrouter (192.168.1.1) 2.965 ms 0.743 ms 0.745 ms 2 * 2.96.54.77.rev.vodafone.pt (77.54.96.2) 12.076 ms 10.871 ms 3 77.41.30.213.rev.vodafone.pt (213.30.41.77) 14.145 ms 10.693 ms 11.960 ms 4 85.205.11.49 (85.205.11.49) 9.658 ms 8.946 ms 9.085 ms 5 85.205.13.105 (85.205.13.105) 57.497 ms 57.621 ms 48.080 ms 6 188.111.129.17 (188.111.129.17) 49.483 ms 51.338 ms 48.852 ms 7 85.205.25.174 (85.205.25.174) 47.891 ms 49.219 ms 47.821 ms 8 * * * 9 * * * 10 * * * 11 * * * I've flushed my DNS cache but nothing changed. This is quite dramatic as it seems to depend on 85.205.25.174 hop and don't know how to avoid it. Any suggestions? I add that 3 days ago everything worked fine. Then it has stopped.

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  • Network randomly drops

    - by user147661
    I have a VPS, ubuntu server 12.04 and for unknown reasons the network connection drops and I have to access my vps via the console and ifdown eth0 and ifup eth0. This brings the connection back up from about a few seconds to a few hours. I have run tail -F /var/log/syslog to monitor the log to see what happens at the point of drop and there is nothing unusual. The vps is running under virt-manager and the hardware is set to virtio. I have had linux friends look at my vps and they are unsure of what is the cause.

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  • Do any of the HP printers have implement printer sharing?

    - by BCS
    I've seen several (home grade) HP prints that have network port and allow connecting to them via that. However I haven't seen any way to use it without installing the printer specific drives. This seems a bit silly because I've seen printer sharing system (SMB I think) that didn't seem to need any printer specific software. My question is: Is there a way to use one of these with my printers? (I'm omitting the exact model in the hopes that answers for several models (or a resource that answers it for several models) will be given.)

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