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  • Case Study: Polystar Improves Telecom Networks Performance with Embedded MySQL

    - by Bertrand Matthelié
    Polystar delivers and supports systems that increase the quality, revenue and customer satisfaction of telecommunication services. Headquarted in Sweden, Polystar helps operators worldwide including Telia, Tele2, Telekom Malysia and T-Mobile to monitor their network performance and improve service levels. Challenges Deliver complete turnkey solutions to customers integrating a database ensuring high performance at scale, while being very easy to use, manage and optimize. Enable the implementation of distributed architectures including one database per server while maintaining a low Total Cost of Ownership (TCO). Avoid growing database complexity as the volume of mobile data to monitor and analyze drastically increases. Solution Evaluation of several databases and selection of MySQL based on its high performance, manageability, and low TCO. The MySQL databases implemented within the Polystar solutions handle on average 3,000 to 5,000 transactions per second. Up to 50 million records are inserted every day in each database. Typical installations include between 50 and 100 MySQL databases, up to 300 for the largest ones. Data is then periodically aggregated, with the original records being overwritten, as the need for detailed information becomes unnecessary to operators after a few weeks. The exponential growth in mobile data traffic driven by the proliferation of smartphones and usage of social media requires ever more powerful solutions to monitor, analyze and turn network data into actionable business intelligence. With MySQL, Polystar can deliver powerful, yet easy to manage, solutions to its customers. MySQL-based Polystar solutions enable operators to monitor, manage and improve the service levels of their telecom networks in over a dozen countries from a single location. The new and innovative MySQL features constantly delivered by Oracle help ensure Polystar that it will be able to meet its customer’s needs as they evolve. “MySQL has been a great embedded database choice for us. It delivers the high performance we need while remaining very easy to use, manage and tune. Power and simplicity at its best.” Mats Söderlindh, COO at Polystar.

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  • How do you search for backdoors from the previous IT person?

    - by Jason Berg
    We all know it happens. A bitter old IT guy leaves a backdoor into the system and network in order to have fun with the new guys and show the company how bad things are without him. I've never personally experienced this. The most I've experienced is somebody who broke and stole stuff right before leaving. I'm sure this happens, though. So, when taking over a network that can't quite be trusted, what steps should be taken to ensure everything is safe and secure?

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  • Find DNS server automatically

    - by jdickson
    I've got a Windows 2012 server set up as a domain controller and DNS server in my basement. On my laptop, if I set it to use the IP address of my server as the DNS server, then it works as expected. The problem with that is that I use my laptop outside my home network and I need to switch it back to automatic. Setup is like this: ISP Router running DD-WRT Win 2012 DC/DNS and other network computers How can I have my laptop find the DNS server automatically instead of using my ISP's DNS servers?

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  • getting input/output error from NFS client on RHEL5

    - by Andrew Watson
    i have two RHEL5 boxes on a private network together (192.168.2.0/24) and I am trying to export a file system from one to the other but I keep getting the following error: mount.nfs: Input/output error on the client side I see this output: mount: trying 192.168.2.101 prog 100003 vers 3 prot tcp port 2049 mount: trying 192.168.2.101 prog 100005 vers 3 prot tcp port 960 and on the server side I see this: Sep 20 14:14:32 omicron mountd[18739]: authenticated mount request from 192.168.2.87:635 for /srv/nfs/web (/srv/nfs/web) but that's all. I opened up iptables so that the whole 192.168.2.0/24 network is allowed to communicate freely but the public side is locked down to 22,80 etc.... any ideas?

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  • Is there a free-embedded SSH solution ?

    - by ereOn
    Hi, I'm working for an important company which has some severe network policies. I'd like to connect from my work, to my home linux server (mainly because it allows me to monitor my home-automated installation, but that's off-topic) but of course, any ssh connection (tcp port 22) to an external site is blocked. While I understand why this is done (to avoid ssh tunnels I guess), I really need to have some access to my box. (Well, "need" might be exagerated, but that would be nice ;) Do you know any web-based solution that I could install on my home linux server that would give me some pseudo-terminal (served using https) embedded in a web page ? I'm not necessarily looking for something graphical: a simple web-embedded ssh console would do the trick. Or do you guys see any other solution that wouldn't compromise network security ? Thank you very much for your solutions/advices.

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  • Why are SW engineering interviews disproportionately difficult?

    - by stackoverflowuser2010
    First, some background on me. I have a PhD in CS and have had jobs both as a software engineer and as an R&D research scientist, both at Very Large Corporations You Know Very Well. I recently changed jobs and interviewed for both types of jobs (as I have done in the past). My observation: SW engineer job interviews are way, way disproportionately more difficult than CS researcher job interviews, but the researcher job is higher paying, more competitive, more rewarding, more interesting, and has a higher upside. Here's a typical interview loop for researcher: Phone interview to see if my research is in alignment with the lab's researcher In-person, give presentation on my recent research for one hour (which represents maybe 9 month's worth of work), answer questions In-person one-on-one interviews with about 5 researchers, where they ask me very reasonable questions on my work/publications/patents, including: technical questions, where my work fits into related work, and how I can extend my work to new areas Here's a typical interview loop for SW engineer: Phone interview where I'm asked algorithm questions and maybe do some coding. Pretty standard. In-person interviews at the whiteboard where they drill the F*** out of you on esoteric C++ minutia (e.g. how does a polymorphic virtual function call work), algorithms (make all-pairs-shortest-path algorithm work for 1B vertices), system design (design a database load balancer), etc. This goes on for six or seven interviews. Ridiculous. Why would anyone be willing to put up with this? What is the point of asking about C++ trivia or writing code to prove yourself? Why not make the SE interview more like the researcher interview where you give a talk about what you've done? How are technical job interviews for other fields, like physics, chemistry, civil engineering, mechanical engineering?

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  • Connect to MS Sql 2008 on local VM

    - by Campo
    I have a test machine. Server 2008 with Hyper V MSSQL 2008 Enterprise Lets call it MACHINE A on the VM it is as well Server 2008 with another MSSQL 2008 Ent Call it VM B I setup a DB on MACHINE A then backed it up and restored following the prepare database for mirroring instructions on MSDN onto VM B. I used to be able to connect to the VM B Instance from the main test server (MACHINE A) but now I cannot for some reason. It cannot seem to find the instance at all even when I browse network databases. I can ping the VM from any computer on the network and access its shares so I know it is discoverable. Just the end of a long day maybe I am missing something here.

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  • VPN Connects with local access only

    - by user20102
    I have Windows Server 2008 and I have set up a VPN. When a user logs into their VPN they can not view the internet. It comes up as local access only on the the client PC. On the server when I go to the Network And Sharing Centre it displays (Network) with local and internet below it has the RAS Dial-in interface and it displays as local only there as well. I want all users that connect to my VPN to have internet access (full access). If anyone can help me it would be appreciated. Also I've activated dial-in properties and I've done it via policy who can access the VPN and internet. It still doesn't work, but there is a connection but just local only. Thanks

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  • Windows server 2008 R2 IIS7 file permissions

    - by StealthRT
    Hey all i am trying to figure out why i can not access a index.php file from within the wwwroot/mollify/backend directory. It keeps coming up with this: Server Error 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied. I've given all the permissions (Full control) to the wwwroot directory i could think of (IUSR, Guest, GUESTS, IIS_IUSRS, Users, Administrators, NETWORK, NETWORK SERVICE, SYSTEM, CREATOR OWNER & Everyone). I also added index.php to the "Default Document" under my website settings in IIS 7 manager. What else am i missing? Thanks! David

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  • How do I rate limit google's crawl of my class C IP block?

    - by Zak
    I have several sites in a class C network that all get crawled by google on a pretty regular basis. Normally this is fine. However, when google starts crawling all the sites at the same time, the small set of servers that back this IP block can take a pretty big hit on load. With google webmaster tools, you can rate limit the googlebot on a given domain, but I haven't found a way to limit the bot across an IP network yet. Anyone have experience with this? How did you fix it?

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  • networking tunnel adapter connections?

    - by Karthik Balaguru
    I understand that Tunnel Adapter LAN is for encapsulating IPv6 packets with an IPv4 header so that they can be sent across an IPv4 network. Few queries popped up in my mind based on this :- If i do 'ipconfig', Apart from ethernet adapter LAN details, I get a series of statments as below - Tunnel adapter Local Area Connection* 6 Tunnel adapter Local Area Connection* 7 Tunnel adapter Local Area Connection* 12 Tunnel adapter Local Area Connection* 13 Tunnel adapter Local Area Connection* 14 Tunnel adapter Local Area Connection* 15 Tunnel adapter Local Area Connection* 16 Except for the *16, all the other Tunnel Adapter Local Area Connections show Media Disconnected. Why is the numbering for the Tunnel adapter LAN not sequential? It is like 6, 7, 12, 13, 14, 15, 16. A strange numbering scheme! I tried to figure it out by thinking of some arithmetic series. But, it does not seem to fit in. There is a huge gap between 7 and 12. Any ideas? What is the need for so many Tunnel Adapter LAN connections? Can you tell me a scenario that requires all of those ? I did ipconfig /all to get more information. From the listing, I understand that: 16, 15, 14, 12 are Microsoft 6to4 Adapters 13, 6 are isatap Adapters 7 is Teredo Tunneling Pseudo-interface I understand that the above are for automatic tunneling so that the tunnel endpoints are determined automatically by the routing infrastructure. 6to4 is recommended by RFC3056 for automatic tunneling that uses protocol 41 for encapsulation. It is typically used when an end-user wants to connect to the IPv6 Internet using their existing IPv4 connection. Teredo is an automatic tunneling technique that uses UDP encapsulation across multiple NATs. That is, It is to grant IPv6 connectivity to nodes that are located behind IPv6-unaware NAT devices ISATAP treats the IPv4 network as a virtual IPv6 local link, with mappings from each IPv4 address to a link-local IPv6 address. That is to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network. That is, to put in simple words, ISATAP is an intra-site mechanism, while the 6to4 and Teredo are for inter-site tunnelling mechanisms. It seems that Teredo should alone enabled by default in Vista, But my system does not show it to be enabled by default. Interestingly, it shows a 6to4 tunnel adapter (Tunnel adapter LAN connection 16) to be enabled by default? Any specific reasons for it? If i do ipconfig /all, why is only one Teredo present while four 6to4 are present ? I searched the internet for answers to the above queries, but I am unable to find clear answers.

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  • High number of ethernet errors. Tool for testing the ethernet card?

    - by Fabio Dalla Libera
    I have an Asus Sabertooth X79. I often get corrupted files. I checked the RAM, but memtest finds no errors. To avoid the possibility of disk errors, I tried copying the files to tmpfs. If I copy from the network, I get md5sum mismatches about once every 10 times using a 6Gb file. Copying from RAM to RAM, I didn't get mismatches. I get a very high number of errors in ifconfig (compared to others PCs I just took as reference, which have 0 with much more traffic). Here is an example RX packets:13972848 errors:200 dropped:0 overruns:0 frame:101 The motherboard is new, but do you think there're some problems with it? What could I use to test the (integrated) network adapter? What else do you think I should double check? --edit-- I tried another NIC, it gives a lot of Corrupted MAC on Input. Disconnecting: Packet corrupt lost connection. I noticed that another PC downloads at 11.1MB/s without problems. This pc at 66.0 MB/s. Is there any way to try to limit the speed?

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  • CentOS 6.5 proxy bypass/no_proxy not working

    - by Naruto Uzumaki
    I am running CentOS 6.5 on my desktop. I've set the Network Proxy using the network proxy application provided under Preferences. I've also set the following exceptions: localhost,127.0.0.0/8,172.16.0.0/12,192.168.0.0./16 But whenever I am using wget (I'm testing the proxy settings using using wget) then wget tries to connect to the proxy for private addresses, but wget localhost works fine and doesn't use the proxy. I also removed all the proxy settings and set the proxy in the shell: export http_proxy="<proxy_url>:<port>" export https_proxy="<proxy_url>:<port>" export no_proxy="localhost,127.0.0.0/8,172.16.0.0/12,192.168.0.0./16" It work when I use the command wget <external_url> or wget localhost but fails when I use the command wget <private address from the $no_proxy variable>. I also tried setting the variables in Ubuntu 14.04 also and facing the same issue. Regards,

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  • Setting up a static IP address (public) in Ubuntu

    - by ycseattle
    I have a business class internet connection and need to setup a static ip address for a machine. I did a search online and only find how to setup static local ip addresses (like 192.168..). I tried the same technique, and only setup the ip address and netmask, but after restart networking the computer could not connect to the outside world. This is what I did: 1) edit /etc/network/interfaces iface eth0 inet static address 173.10.xxx.xx netmask 255.255.255.252 2) edit /etc/resolv.conf search wp.comcast.net nameserver xx.xx.xx.xxx nameserver xx.xx.xx.xxx 3) restart network sudo /etc/init.d/networking restart Now the last step didn't report error, ifconfig shows the ip address was set, but this server cannot connect to outside world, ping google.com and reports "unknown host google.com". Any ideas?

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  • Static Routes and the Routing Table

    - by TheD
    This is very much a learning question if someone would be happy to explain a couple of concepts. My question is - the default routing table that exists in, in my case, a default Windows 7 install, what do each of the routes in the table do? Here is a screenshot: The 10.128.4.0 is just a route I've added while messing. I understand from a question I posted on Superuser the first route is just a default route that will route all traffic for any IP to my default gateway on my Interface in use. But what about the others? And how would the routing table handle a machine with multiple NIC's, perhaps connected to two different networks, or maybe even two NIC's on the same network so a VM can have a physical Network card instead of each VM sharing the hosts. Thanks!

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  • Configuring Ubuntu for Global SOCKS5 proxy

    - by x50
    Does anyone know the best way to configure Ubuntu to use a SOCKS5 proxy for all network traffic? Server is ubuntu server - all cli. So I cannot set via the Proxy Settings GUI. We want to push all outbound traffic through the proxy (apt-get, http, https, etc). I do need to separate ssh traffic so it stays locally. Everything else should hit the proxy server. not that it matters, but I'm using Squid for the proxy server. I know this is easy on Mac and Windows as you can set a proxy on the actual network interface. Can you do the same on Ubuntu?

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  • dhcpd won't let go of old leases

    - by Jakobud
    We have DHCP setup to hand out leases in the following range: 192.168.10.190 - 192.168.10.254 (roughly 65 leases) Our small business network only has about 30 computers that use DHCP. We noticed that dhcpd stopped handing out new dynamic leases to the computers, even though there are definitely not 65 computers on the network. Why has it stopped handing out leases? Is it not releasing old un-used leases? How do we tell dhcpd to let go of old leases and start handing out fresh ones again?

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  • Linux/bsd tcp load balancing with 10 gigabit ethernet

    - by user37899
    Okay, I've been looking at layer 4 load balancing solutions for 10 gigabit links. I need the following properties Works at 10Gig ethernet speeds. Can support long live tcp connections. up to 1mil live tcp connections. Balancer not involved in the return path. Fault tolerant with tcp session fail over. low latency and good through put. can be scripted. Either a software or hardware solution. Can it be done? Anyone doing this?

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  • static routes, cisco ASA, remote locations

    - by Jeff
    192.168.3.1(ASA) - 192.168.2.1(ASA) - ( internet ) - 192.168.1.1(ASA) DomainController, FS, Exchange 192.168.0.1(ASA) - above is a rough idea what my network setup looks like. each internal ip (192.168.x.x) is located behind an ASA. Each location has a different gateway for the internet. They all talk to the 192.168.1.1 network for dns, dhcp, dc, exchange and so on. They can only see the 192.168.1.1, they can not see each other. In my Static Routes on my 192.168.1.1 ASA, should i have them configure as follows? example: 192.168.x.x 255.255.255.0 Locations_Internet_Gateway_IP OR 192.168.x.x 255.255.255.0 Main_Locations_Internet_Gateway_IP not sure which configurtation is correct, thanks in advance for any help!

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  • MIDI Over Networking on OSX: Lots of beachballing

    - by Yar
    I have 4 computers connected to a Wifi router (with no Internet uplink). Whenever we enter the Network interface for Audio/Midi preferences in ANY of the computers, the Mac beachballs and then finally finds its way. Occasionally, however, one of the computers fails to receive the MIDI information that was destined for it via the Network MIDI interface. Changing to all wired connections does NOT help. Adding Internet uplink DOES help and the problem is resolved. This makes no sense to me as the computers can access each other just fine with or without the Internet uplink. Any ideas? [NOTE: I'll update the question if people correct my terminology, or feel free to do that if you have the rights].

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  • AWS Autoscaling issue with existing nodes in ELB

    - by Ram Prasad
    I already have a ELB setup called MyLoadBalancer. I already have 2 nodes running on it with health checks (that checks a URL on the node to see if they are up) Created an autoscaling group (min 2, Max 10) Associated launchconfig mylaunchconfig that provisions a node using an AMI Created a trigger, that checks for avg min connections of 100 and Max of 500 (checks the load balancer and it is support to increase the node count by 1, if avg connections are 500 and decrease by one if less than 100) as-create-or-update-trigger MyTrigger --auto-scaling-group MyAutoScalingGroup --namespace "AWS/ELB" --measure RequestCount --statistic Average --dimensions "LoadBalancerName=MyLoadBalancer" --period 60 --lower-threshold 500 --upper-threshold 800 --lower-breach-increment=-1 --upper-breach-increment=1 --breach-duration 600 Now the issue is, as soon as I put in the trigger, it start 2 nodes .... but there are already two nodes in the LB. So, why is it provisioning 2 more nodes, when the nodes are there ? is it because it is not recognizing the existing 2 nodes ? then how do I add the existing nodes to the AutoScaling group ?

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  • default gateway of a host

    - by varun
    if my understanding is correct, the following is what happens when a host A wants to communicate with a machine X outside its network. 1) The host ,checks it routing table to find out if there is any direct routes to the machine. 2) It finds out that the machine is outside its network and has to sent the packets to the default gateway(router) R. 3) The host sents an ARP broadcast to get the mac of the router R. 4) After getting the MAC, the host creates a packet with src IP and MAC as that of the host A, dest IP of the remote machine X and dest MAC of the router R. 5)The router R receives the packet, either drops its or sents its to its next hope, which can be another router or the remote machine X itself. Can anyone explain, how the steps would be, if i set the default gateway of the host A as host A itself...?

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  • Useless Plesk Error?

    - by Josh Pennington
    I am trying to determine why Plesk on my server won't start and I have no idea where to even start (since my hosting company appears to not want to help me out). Anyways, the error in my Plesk error_log is as follows: 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) It leads me to believe its a problem with the SSL on the server but I am not sure what to make of the error. Can someone lead me in the right direction? Thanks Josh Pennington

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  • What the hell was THAT?!?

    - by Massimo
    My system is Windows XP SP3, updated with the latest patches. The PC is connected to a Cisco 877 ADSL router, which does NAT from the internal network to its single static public IP address. There are no forwarded ports, and the router's management console can only be accessed from the inside. I was doing two things: working on a remote office machine via VPN and browsing some web pages on the Cisco web site. The remote network is absolutely safe (it's a lab network, four virtual servers, no publicly accessible services and no users at all; also, none of what I'm going to describe ever happened there). The Cisco web site... well, I suppose is quite safe, too. Suddenly, something happened. Strange popups appears anywhere; programs claiming they're "antimalware", "antispyware" et so on begins autoinstalling; fake Windows Update and Security Center icons pop up in the system tray. svchost.exe began crashing repeatedly. Then, finally, after some minutes of this... BSOD. And, upon rebooting, BSOD again. Even in safe mode. Ok, that was obviously some virus/trojan/whatever. I had to install a new copy of Windows on another partition to clean things up. I found strange executables, services and DLLs almost anywhere. Amongst the other things, user32.dll and ndis.sys had been replaced. A fake software called "Antimalware Doctor" had been installed. There were services with completely random names or even GUIDs (!), and also ones called "IpSect" and "Darkness". There were executable files without an .exe extension. There were even two boot-class drivers, which I'm quite sure are the ones that finally caused the system to crash. A true massacre. Ok, now the questions: What the hell was that?!? It was something more than a simple virus! How did it manage to attack my computer, as I am behind a firewall and was not doing anything even only potentially harmful on the web at the time?

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  • WEP authentication suddenly failing in Ubuntu

    - by kellishaver
    I'm running Ubuntu 9.10 and after a recent reboot, I'm now unable to authenticate to wireless networks using WEP encryption. I can connect fine to open networks (no idea about WPA). When trying to connect via WEP, I'm continually prompted for the network key, which I know I have entered correctly (and should have been/is saved in my keyring anyway). Everything had been working fine until the reboot. No updates had been installed or configuration changes made. Hardware-wise, everything looks fine (http://pastebin.org/113777), and the fact that connecting to an open network works just fine leads me to think this is a software issue. I just don't know where to begin fixing it. Any insights would be greatly appreciated.

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