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  • What are different ways to reduce latency between a server and a web application? [closed]

    - by jjoensuu
    this is a question about a web application that provides SOAP web services. For the sake of this question, this web app is hosted on a server SERVER B which is located in California. We have an automated, scheduled, process running on a server SERVER A, located in New York. This scheduled process is supposed to send SOAP messages to SERVER B every so often, but this process typically dies soon after starting. We have now been told by the vendor that reason why the process dies is because of the latency between SERVER A and SERVER B. The data traffic is routed through many diffent public networks. There is no dedicated line between SERVER A and SERVER B. As a result I have been asked to look into ways to reduce the latency between SERVER A and SERVER B. So I wanted to ask, what are the different ways to reduce latency in a situation like this? For example, would it help to switch from HTTPS to some other secure protocol? (the thought here is that perhaps some other alternative would require fewer handshakes than HTTPS). Or would a VPN help? If a VPN would reduce the latency, how would it do that? NOTE: I am not looking for an explicit answer that would work in my specific situation. I am more like looking just for a simple list of what technologies could be used for this. I will still have to evaluate the technologies and discuss them internally with others, so the list would just be a starting point. Here I am assuming that there exists very few ways to reduce latency between two servers that communicate across public networks using HTTPS. Feel free to correct me if this assumption is wrong and please ask if there is a need for specific information. NOTE 2: A list of technologies is a specific answer to the question I stated in the title. NOTE 3: Its rather dumb to close this question when it is after all about me looking for information and furthermore this information can clearly be useful for others. Anyway luckily there are other sites where I can ask around. StackExchange seems to attached to their own philosophical principles. Many thanks

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  • Putting Ubuntu Server on to a networked HDD

    - by SimplySimon
    Firstly, I know very little about servers and secondly the 1Tb HDD I have has network capabilities, but no software is installed on it, so when connected to the computer it is seen as a network connection, but not as a drive. Any advice on how to get started would be great. Up until now, I have been using it as a USB drive which worked well, but when this is sorted, I would like it to be connected directly to our BT HomeHub accessible through the WiFi for all the family to use as a film and back up repository. I would then be able to set up individual accounts for each family member to use and may be, if possible, make it accessible from outside locations. The First question then is: How can I install Ubuntu server on the 1Tb HDD attached directly to the computers network port but which doesn't show up in Nautilus? HDD Western Digital 1.0Tb LBA 1953525168 Model: WD10EACS-00DB0 DCM: DHRNHT2CF

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  • How Does Windows Confirm Wi-Fi Access and Whether Hot Spot Authentication Is Necessary?

    - by Jason Fitzpatrick
    Windows is quite adept at telling you if you have a properly functioning Internet connection, but how exactly does it do so? Digging into how Windows handles the problem offers insight into Windows connectivity messages. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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  • Lag compensation with networked 2D games

    - by Milo
    I want to make a 2D game that is basically a physics driven sandbox / activity game. There is something I really do not understand though. From research, it seems like updates from the server should only be about every 100ms. I can see how this works for a player since they can just concurrently simulate physics and do lag compensation through interpolation. What I do not understand is how this works for updates from other players. If clients only get notified of player positions every 100ms, I do not see how that works because a lot can happen in 100ms. The player could have changed direction twice or so in that time. I was wondering if anyone would have some insight on this issue. Basically how does this work for shooting and stuff like that? Thanks

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  • Is the TCP protocol good enough for real-time multiplayer games?

    - by kevin42
    Back in the day, TCP connections over dialup/ISDN/slow broadband resulted in choppy, laggy games because a single dropped packet resulted in a resync. That meant a lot of game developers had to implement their own reliability layer on top of UDP, or they used UDP for messages that could be dropped or received out of order, and used a parallel TCP connection for information that must be reliable. Given the average user has faster network connections now, can a real time game such as an FPS give good performance over a TCP connection?

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  • Regulating outgoing traffic on ubuntu VM

    - by DazSlayer
    I am making a virtual network setup for my high school cybersecurity team to practice. I am connecting all the VMs together through a VPN and then people who are practicing will VPN in and ssh/remote desktop into the different VMs. The problem is that for practicing, they will need root access into the VMs and because the VMs are connecting to my personal network, the VMs pose a security risk to my personal network. Is there any way in either VMWare or VirtualBox or even making an unchangeable iptable (I can make all the windows VMs go thru a linux VM) to prevent people from connecting to my local network via the VM?

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  • Static IP breaks Network connection

    - by Pasquale Tedesco
    I am somewhat new to Linux. I am setting up a Web server and installed Ubuntu server 14.04 on an vSphere ESXi 5.5 host. I am connecting perfectly fine to the internet when using DHCP but when I apply my Static settings I loose the ability to connect to websites. Whats weird is I can Ping google.com but if I try wget gooogl.com it hangs at connecting to google.com (google.com):173.194.43.32:80 and I get "failed: connection refused" But if I am set to DHCP the connection resolves perfectly. Thanks # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 #iface eth0 inet dhcp iface eth0 inet static address 10.1.2.25 gateway 10.1.2.2 netmask 255.255.255.0 search tsig.com dns-nameservers 10.1.2.13 10.1.2.30

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  • Broadcom bcm4313 Ubuntu 13.10 connection time out

    - by Wahtever
    After upgrading to Ubuntu 13.10 I keep getting connection timed out every few seconds at which point i have to disconnect and reconnect to the WiFi network. The WiFi card worked fine on 13.04 with the bcmwl-kernel-source installed but giving problems on 13.10: *-network description: Wireless interface product: BCM4313 802.11bgn Wireless Network Adapter vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:02:00.0 logical name: eth1 version: 01 serial: c0:14:3d:cc:c9:c7 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=6.30.223.141 (r415941) ip=192.168.1.4 latency=0 multicast=yes wireless=IEEE 802.11abg resources: irq:17 memory:f0500000-f0503fff How can i fix this? Thanks

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  • Connection to openVPN Access Server

    - by Beig
    we are using an openVPN Access Server and I would like to connect to it via the VPN network setting (network-manager-openvpn). I downloaded the client.ovpn and I can connect to the server via the command line: openvpn --script-security 2 --config client.ovpn How can I add the connection to the network manager? Which (key) entry is which? User Cert, CA Cert, Private Key? Here is an example of the client.ovpn http://nopaste.info/c10ec207f2.html Thanks in advance.

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  • Connection timed out when connecting to a website (ubuntu only)

    - by S.C.
    I've been struggling with these problem for months. It happens randomly and it happens on Ubuntu only (12.04). It's about my hosted company website. Some facts: I can ping it I can traceroute it I can dig it I can make a nslookup But whenever I try to open it in Chrome it won't open. I also tried using polipo but got same connection time out issue. I'm connected through a LAN network and I'm experiencing no problem with any other website. Is there a more accurate debugging technique I'm missing other than pinging/tracerouting, etc.?

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  • Ubuntu Server 12.04 as a router. Problem with DNS?? Or Routing table?

    - by Lorenzo
    I have a virtualbox lab made up of 4 Windows 2008 R2 servers (DC/DNS,SQL,SHAREPOINT, EXCHANGE) that are configured with static ip addresses with NIC's attached to Internal network. Everything works. I had the requirement to execute some tests that also access external services available on the internet. To keep things clean and similar to the production environment I have installed another VM, with Ubuntu Server 12.04 64 bit and configured (I hope) to work as a router like described on this post. This VM has two network interfaces: first is Bridged with the host and is used as a WAN connection and the other one attached in the Internal Network with its own static IP address on the internal network subnet. But actually the Windows servers does not connect to the internet while the unix one connects. I did a route command. this is the result: Kernel IP Routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.69.121.1 0.0.0.0 UG 100 0 0 eth0 10.69.121.0 * 255.255.255.0 U 0 0 0 eth0 192.168.83.0 * 255.255.255.0 U 0 0 0 eth1 Can somebody help me with this configuration? :) Thanks! Addendum: I forgot to mention that one of the windows server hosts a DNS service for which I should maybe configure a forwarding server but I do not exactly know which server to forward on... :(

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  • Asus 1001P freezes after chaging network settings

    - by auntiquarian
    I'm running Ubuntu 11.04 on a Asus PC 1001P in a dual boot environment with XP. All has been running fine for several weeks, but: I've just changed ISP (from Tiscali to BT), and had already sorted out connection, registration, etc. on a Dell laptop. On the Asus I went into Ubuntu to alter the wireless network details (i.e. selected the new network, and entered the password). Ubuntu immediately started running slowly, and after rebooting it now freezes when it gets to the Ubuntu logo and gets no further. Please help, lovely Ubuntu experts.

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  • How to direct a Network Solutions domain name to an html website hosted on Google Drive? [on hold]

    - by Air Conditioner
    To begin with, I'd wanted to take advantage of HTML, CSS, and so on to build a website that looks and works just as I'd like it to. I took a look around on how I could make that work, and I soon saw a lifehacker article showing that its possible to host website files on google drive. I then made sure that the folder containing the files was shared publicly throughout the web, and I now have a working 'google drive hosted' domain for the website. However, I did want to have the custom domain, and so I registered one with network solutions. So now, I'm curious on how I should direct my Network Solutions domain to the index.html I'm hosting on google drive. Would anyone have an Idea?

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  • svn-based versioning tool, problem with network timeout

    - by Scarlet
    My dev team was committed a versioning tool based on Subversion to run on Windows (our svn client is sliksvn). We're developing with Delphi XE2, should that matter. We're asked to implement a "check for updates availability" feature, which has to work as follows: Connect to the SVN repo via svn+ssh protocol; See if there are changes to receive and list them; Let the user decide if he wants to receive changes or not. We don't have a great knowledge on svn, so we thought to implement that thing client side by a certain number of CreateProcess calls that wrap directly proper svn commands. Anyways what we perceived is that if network problems should arise, such like a connection drop, svn client hangs forever waiting for the operation to close instead of failing for timeout. We know that CreateProcess can be given a timeout argument, but it wouldn't be correct to use it, as we can't know from outside how long will be the svn operation taking to complete. Is there any way to avoid that deadlock?

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  • How to make ip Address static (eth0)

    - by Jordan Angelucci
    I'm having a really hard time configuring ubuntu 13.04 to have a static ip address. I have tried multiple solutions but everytime I reboot (can't do the network reset command because ubuntu freezes) I end up with no connection. Here is what I get when i type ifconfig into the terminal: eth0 Link encap:Ethernet HWaddr 10:bf:48:bc:07:cb inet addr:192.168.0.8 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::12bf:48ff:febc:7cb/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1763067 errors:0 dropped:0 overruns:0 frame:0 TX packets:1024326 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2284491220 (2.2 GB) TX bytes:136809317 (136.8 MB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:1840 errors:0 dropped:0 overruns:0 frame:0 TX packets:1840 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:185688 (185.6 KB) TX bytes:185688 (185.6 KB) I have also tried this: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.0.160 netmask 255.255.255.0 broadcast 192.168.0.255 gateway 192.168.0.1 dns-nameservers 24.222.0.94 dns-nameservers 24.222.0.95 If anyone could help me it would be very much appreciated.

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  • How to perform game object smoothing in multiplayer games

    - by spaceOwl
    We're developing an infrastructure to support multiplayer games for our game engine. In simple terms, each client (player) engine sends some pieces of data regarding the relevant game objects at a given time interval. On the receiving end, we step the incoming data to current time (to compensate for latency), followed by a smoothing step (which is the subject of this question). I was wondering how smoothing should be performed ? Currently the algorithm is similar to this: Receive incoming state for an object (position, velocity, acceleration, rotation, custom data like visual properties, etc). Calculate a diff between local object position and the position we have after previous prediction steps. If diff doesn't exceed some threshold value, start a smoothing step: Mark the object's CURRENT POSITION and the TARGET POSITION. Linear interpolate between these values for 0.3 seconds. I wonder if this scheme is any good, or if there is any other common implementation or algorithm that should be used? (For example - should i only smooth out the position? or other values, such as speed, etc) any help will be appreciated.

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  • Network disabled on some wake-ups on saucy laptop

    - by Arild
    Since I upgraded to Saucy Salamander 13.10, with every third suspend or so, the network is disabled and I'm unable to re-enable it. I've had to reboot to make it run again. The network menu will have the option Enable network but clicking it will only produce a tick in the menu item, nothing else changes. How can I make it enable automatically after suspend? In the meantime, is there a workaround to at least manually re-enable it? The PC is a Lenovo IdeaPad S205 using drivers r8169 and rt2800pci.

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  • Driver for asus wireless PC card WL-100GE

    - by emab
    I have bought an Asus wireless LAN PC Card WL-100GE model, and I am using lubuntu on my system. While I have no cable connection, currently I cannot access the internet and update my laptop. Device: Broad Range Wireless Card Bus Adaptor - Asus - WL-100GE I searched the web and couldn't find any adequate driver for it. Is there any solution for it? My sudo lshw -C network output is: *-network description: Ethernet interface product: RTL-8100/8101L/8139 PCI Fast Ethernet Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 3 bus info: pci@0000:02:03.0 logical name: eth0 version: 10 serial: 00:02:3f:ba:55:c8 size: 10Mbit/s capacity: 100Mbit/s width: 32 bits clock: 33MHz capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=half latency=128 link=no maxlatency=64 mingnt=32 multicast=yes port=MII speed=10Mbit/s resources: irq:19 ioport:3000(size=256) memory:e0200800-e02008ff *-network description: Network controller product: BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller vendor: Broadcom Corporation physical id: 1 bus info: pci@0000:07:00.0 version: 02 width: 32 bits clock: 33MHz capabilities: bus_master configuration: driver=b43-pci-bridge latency=64 resources: irq:21 memory:38000000-38001fff ----:~$ iwconfig lo no wireless extensions. eth0 no wireless extensions.

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  • Connecting Ubuntu home server to internet via laptop

    - by Gray-Wolfe
    I recently got a spare desktop computer from a relative to play around with and since I've been using Ubuntu for a few years I decided to install Ubuntu Server 12.04 to play around with and learn more. However it doesn't have a wireless card, the wireless adapter had a shipping error and will be awhile, and plugging it into the router is not an option. So I figured I could give it access to the wifi from my laptop(which I switch between Windows and Ubuntu) so I could at least get some things started and set up while I'm waiting for the adapter. However the few guides I can find to do that require a GUI, something lacking on the server version. Could someone tell me how to set this up via the terminal? I would appreciate it.

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  • Best strategy to discover a web service in a local network?

    - by Ucodia
    I am currently doing some research for a project. The setup is simple, I have a computer running a service in my home network and any device connected to that same network should be able to discover the service automatically and use it. I have no specific technology requirement whether it is on the server or client side. The client knows about the service definition. Other than that I have no idea what strategy to use, what technology to look at or whether I should go for a SOAP or a HTTP based service. I think going HTTP with REST API is the best for targeting all devices but I am opened to any suggestions. Thanks.

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  • Ubuntu 12.04 - no wireless network recognized

    - by Itai
    I just installed Ubntu 12.04 along with WIN7 on the same laptop - Dell Vostro-3560. Now, on Win7 i can access to different wi-fi networks. However, when i am logging onto the Ubuntu section (after re-starting my laptop) - an error message appears: "Disconnected - you are now offline". When i take a look at my network menu (in the upper bar on the screen), i see that no network is found (and i have a few of them in the area...). I tried to look around but really could not find a concrete practical solution to this specific problem, would appreciate any solution from anyone out there that had this problem and solved it. Thanks... Itai

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  • MacMini (running Ubuntu 14.04) loses wlan connection when uploading larger files (several 100 mb) via ownCloud

    - by ManekenT
    I installed Ubuntu 14.04 on an old MacMini with the intention of running it as a homeserver. Additionally I installed ownCloud and tried to sync some files both from a laptop running elementaryOS and a desktop running windows 7. Syncing smaller files workes like a charm (4000 files at <10mb each) but when it comes to bigger files (1 GB ubuntu iso e.g.) the upload failes after 20-100mb. I can't ping the server anymore and the server can't ping me. It still shows up in our router as connected though. Disconnecting and reconnecting the wlan connection fixes the issue until the next attempt at syncing. Edit: I also had to install the wlan driver with this manual: https://help.ubuntu.com/community/MacBookPro8-2#Wireless

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  • How can I use smbclient to connect to Windows shares by hostname when a firewall is enabled?

    - by skyblue
    I can't connect to file shares on Windows computers using smbclient -L //hostname when the firewall is enabled. This occurs whether I'm using ufw (which allows outgoing traffic and replies back in with the default configuration) or iptables (where I'm allowing outgoing traffic and replies back in with iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT). However, smbclient -L //ip-address works whether the firewall is enabled or not. I also tested this against a Samba server running on Ubuntu and again smbclient -L //hostname does not work when the firewall is enabled, but smbclient -L //ip-address works whether the firewall is enabled or not. For reference, here are the iptables rules I used during testing: *filter :INPUT DROP [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT COMMIT

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  • What data-structure/algorithm will allow me to send a list of key/value dictionaries using the least amount of bits?

    - by user12365
    I have server objects that have corresponding client objects. The data to be kept in sync is inside the server object's key/value dictionary. To keep the client objects in sync with the sever objects, I want the server to send the key/value dictionary every frame for each object. What data-structure/algorithm will allow me to send a list of key/value dictionaries using the least amount of bits? Bonus constraint 1: For each type of object, the values of some keys change more often than others. Bonus constraint 2: Memory usage on the server side is relatively expensive.

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  • WIFI looses connection with AR9285 - have to disconnect / connect to regain internet?

    - by CodyLoco
    I have a G73JW laptop using Ubuntu 12.04. It has an Atheros AR9285 card. While wifi seems to work fine most of the time, about every hour or two it will loose the connection to the internet. The connection will appear to be connected still to the wireless router, but internet access is gone. Disconnecting and reconnecting to the access point solves the problem, as does disabling and reenabling the adapter via the hardware keyboard shortcut. How might this be solved so the connection is stable and doesn't drop? EDIT: It looks like the network dropping isn't related to DNS as it fails either way: codyloco@CodyLoco-Ubuntu:~$ dig askubuntu.com @8.8.8.8 ; <<>> DiG 9.8.1-P1 <<>> askubuntu.com @8.8.8.8 ;; global options: +cmd ;; connection timed out; no servers could be reached codyloco@CodyLoco-Ubuntu:~$ dig askubuntu.com ; <<>> DiG 9.8.1-P1 <<>> askubuntu.com ;; global options: +cmd ;; connection timed out; no servers could be reached Again cycling (disabling / enabling) the adapter corrects the issue.

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