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  • Network tries to reindentify itself now and then

    - by Don Young
    When the computer starts up it connects itself to the router (ZTE 4G router) automatically, but after I have surfed the web for a while, it tries to identify itself, meaning you get that little blue circle next to the little screen at the corner. When browsing it does not cause any problems, but if I'm streaming a video the video will then stop, I'll have to refresh the page to make the video start again. And if I'm playing a game, LoL for example, the game will freeze for about 2 seconds then continue again (due to lost connection to the internet). I have no virus on my computer, although I had before. I have reset my router, restarted my computer, updated my ethernet driver, checked so that the IPv4 is set on automatic and tried different router channels. I have had this router for a few months and the problem just started recently. Here is the ipconfig screen:

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  • Connecting to network device behind NAT from local LAN using the external port and IP

    - by lumbric
    I noticed at several different LANs connected to the Internet through a NAT the following phenomena. There is a server in the LAN and there is a port forwarding to reach this server also from outside the LAN through the NAT. E.g. consider a LAN with the address 192.168.0.* and a SSH server at 192.168.0.2 with port 22 and a forwarding from port 2222 at the NAT 192.168.0.1 to 192.168.0.2:22. If the NAT's external IP is 44.33.22.11, one can connect to the SSH server through 44.33.22.11:2222. Surprisingly this works only from outside the LAN. If one tries to connect to 44.33.22.11:2222 from behind the NAT, there is no answer. Of course one could simply use 192.168.0.2:22, but often it is simpler to use the external IP. The typical use case for me is the configuration on a laptop computer. Usually the user uses any arbitrary Internet connection to connect to his home or office server, but sometimes he will use also the LAN to connect to it and it would be annoying to have to different configurations or bookmarks. Why does it fail to connect from inside the LAN? Is there any good work around?

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  • solaris + match the network device name according to IP address

    - by yael
    how to find the device name as ( e1000g2 , e1000g3 , etc ) according to his IP address on Solaris machine for example ifconfig -a | grep 10.106.134.133 inet 10.106.134.133 netmask ffffff00 broadcast 10.106.134.255 ifconfig with grep command view only the line with the IP address , and the device name appears before the IP address so my target is to match the device name according to the IP address on Solaris machine , and then insert the device name in to parameter ( ksh ) please advice? full example: from ifconfig -a ( I get the IP and device name , what I need is to find the device name according to IP address , and insert the device name in to parameter ) e1000g2: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 inet 10.106.134.133 netmask ffffff00 broadcast 10.106.134.255

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  • Client Server communication in Java - which approach to use?

    - by markovuksanovic
    I have a typical client server communication - Client sends data to the server, server processes that, and returns data to the client. The problem is that the process operation can take quite some time - order of magnitude - minutes. There are a few approaches that could be used to solve this. Establish a connection, and keep it alive, until the operation is finished and the client receives the response. Establish connection, send data, close the connection. Now the processing takes place and once it is finished the server could establish a connection to the client to send the data. Establish a connection, send data, close the connection. Processing takes place. client asks server, every n minutes/seconds if the operation is finished. If the processing is finished the client fetches the data. I was wondering which approach would be the best way to use. Is there maybe some "de facto" standard for solving this problem? How "expensive" is opening a socket in Java? Solution 1. seems pretty nasty to me, but 2. and 3. could do. The problem with solution 2. is that the server needs to know on which port the client is listening, while solution 3. adds some network overhead.

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  • Listening UDP or switch to TCP in a MFC application

    - by Alexander.S
    I'm editing a legacy MFC application, and I have to add some basic network functionalities. The operating side has to receive a simple instruction (numbers 1,2,3,4...) and do something based on that. The clients wants the latency to be as fast as possible, so naturally I decided to use datagrams (UDP). But reading all sorts of resources left me bugged. I cannot listen to UDP sockets (CAsyncSocket) in MFC, it's only possible to call Receive which blocks and waits. Blocking the UI isn't really a smart. So I guess I could use some threading technique, but since I'm not all that experienced with MFC how should that be implemented? The other part of the question is should I do this, or revert to TCP, considering reliability and implementation issues. I know that UDP is unreliable, but just how unreliable is it really? I read that it is up to 50% faster, which is a lot for me. References I used: http://msdn.microsoft.com/en-us/library/09dd1ycd(v=vs.80).aspx

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  • IPv6 feature in Network Adaptor is Slowing Internet

    - by Teknophilia
    The past few days, my internet browsing has become very poor. It's not a matter of speed, as a speed test will give at least 15Mbps. It seems as if my laptop has a hard time actually connecting to the sites. I've found a possible culprit, but don't know why it would affect anything: Going to adapter settings and disabling ipv6, but leaving ipv4, my browsing is back to normal. Re-enabling ipv6 brings back the issue. This is strange though, because I have always had ipv6 enabled. Moreover, using sites to test ipv6 compatibility, I fail with ipv6 enabled on my adapter, and pass when it's disabled. Ideas about why this is happening, and how to fix it?

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  • System Center 2012 R2 System Discovery Network Utilization

    - by AtomicReaction
    I'm in charge of a deployment of Microsoft System Center Configuration Manager 2012 R2. Currently, I'm working through the discovery methods and trying to decide how to enable automatic discovery of systems and users. On Microsoft's documentation, they warn that Configuration Manager Automatic Discovery traffic can get pretty significant if you aren't careful in your implementation. Can anyone who has used this give me some information on how much traffic I should expect? We currently have around 1000 computers and 4000 user accounts in Active Directory. Thanks!

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  • How do I get to the bottom of network latency and bandwidth issues

    - by three_cups_of_java
    I recently moved two blocks south. That move moved me from Comcast to Broadstripe (high-speed internet cable providers). Comcast was pretty good. Broadstripe sucks. I called them on the phone, and they basically brushed me off (politely). I want to come to them with some numbers, so I can say more than just "it's really slow". I still have access to my old Comcast service, so I can run the tests using both providers. Here's what I'm seeing with my new Broadstripe service: 1) When I browse to most sites, there is a long delay (5-10 seconds) before the page starts loading in my browser 2) The speed test tell me I have 12 megs down (bullshit) 3) I have a server at my office. I just downloaded some files (using scp on the command line). It said I'm getting 3.5 KB/s I'm an experienced programmer and spend most of my days on the command line and in vim. Networking, however is not a strong point. I've played around with traceroute, but I'm not sure if that's the right tool to use. I have access to servers all over the country (I would just use Amazon EC2 to set up a test server), and I prefer to use Ubuntu for my testing. How can I come up with some hard numbers to show Broadstripe how crappy their service is?

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  • How to filter and intercept Linux packets by using net_dev_add() API?

    - by Khajavi
    I'm writing ethernet network driver for linux. I want to receive packets, edit and resend them. I know how to edit the packet in packet_interceptor function, but how can I drop incoming packets in this function?? #include <linux/netdevice.h> #include <linux/skbuff.h> #include <linux/ip.h> #include <net/sock.h> struct packet_type my_proto; int packet_interceptor(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { // I dont want certain packets go to upper in net_devices for further processing. // How can I drop sk_buff here?! return 0; } static int hello_init( void ) { printk(KERN_INFO "Hello, world!\n"); my_proto.type = htons(ETH_P_ALL); my_proto.dev = NULL; my_proto.func = packet_interceptor; dev_add_pack(&my_proto); return 0; } static void hello_exit(void) { dev_remove_pack(&my_proto); printk(KERN_INFO "Bye, world\n"); } module_init(hello_init); module_exit(hello_exit);

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  • Fastest reliable way for Clojure (Java) and Ruby apps to communicate

    - by jkndrkn
    Hi There, We have cloud-hosted (RackSpace cloud) Ruby and Java apps that will interact as follows: Ruby app sends a request to Java app. Request consists of map structure containing strings, integers, other maps, and lists (analogous to JSON). Java app analyzes data and sends reply to Ruby App. We are interested in evaluating both messaging formats (JSON, Buffer Protocols, Thrift, etc.) as well as message transmission channels/techniques (sockets, message queues, RPC, REST, SOAP, etc.) Our criteria: Short round-trip time. Low round-trip-time standard deviation. (We understand that garbage collection pauses and network usage spikes can affect this value). High availability. Scalability (we may want to have multiple instances of Ruby and Java app exchanging point-to-point messages in the future). Ease of debugging and profiling. Good documentation and community support. Bonus points for Clojure support. What combination of message format and transmission method would you recommend? Why? I've gathered here some materials we have already collected for review: Comparison of various java serialization options Comparison of Thrift and Protocol Buffers (old) Comparison of various data interchange formats Comparison of Thrift and Protocol Buffers Fallacies of Protocol Buffers RPC features Discussion of RPC in the context of AMQP (Message-Queueing) Comparison of RPC and message-passing in distributed systems (pdf) Criticism of RPC from perspective of message-passing fan Overview of Avro from Ruby programmer perspective

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  • Home router for higher network loads

    - by Zizzencs
    I'm trying to find a replacement for my ASUS WL500GP router. Some constraints: my ISP now provides 120 Mbit bandwidth - the router must be able to handle it I have 3 computers and a laptop at home - the router must have at least 4 LAN ports and the WAN port I need to be able to do the following in parallel: use bittorrent with ~1000 connections transfer files from one home computer to another at high speed access one home computer from my workplace I don't really need wireless I don't really want two boxes to serve all these purposes. So I was searching for a router with 1 Gbit ports, jumbo frame support and good reviews, but haven't really found a promising candidate so far. Any suggestions?

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  • Ubuntu Wired network(ethernet does not work)

    - by user36777
    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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  • Simulate stochastic bipartite network based on trait values of species - in R

    - by Scott Chamberlain
    I would like to create bipartite networks in R. For example, if you have a data.frame of two types of species (that can only interact across species, not within species), and each species has a trait value (e.g., size of mouth in the predator allows who gets to eat which prey species), how do we simulate a network based on the traits of the species (that is, two species can only interact if their traits overlap in values for instance)? UPDATE: Here is a minimal example of what I am trying to do. 1) create phylogenetic tree; 2) simulate traits on the phylogeny; 3) create networks based on species trait values. # packages install.packages(c("ape","phytools")) library(ape); library(phytools) # Make phylogenetic trees tree_predator <- rcoal(10) tree_prey <- rcoal(10) # Simulate traits on each tree trait_predator <- fastBM(tree_predator) trait_prey <- fastBM(tree_prey) # Create network of predator and prey ## This is the part I can't do yet. I want to create bipartite networks, where ## predator and prey interact based on certain crriteria. For example, predator ## species A and prey species B only interact if their body size ratio is ## greater than X.

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  • DB management for Heroku apps

    - by zetarun
    Hi all, I'm fairly new to both Rails and Heroku but I'm seriously thinking of using it as a platform to deploy my Ruby/Rails applications. I want to use all the power of Heroku, so I prefer the "embedded" PostgreSQL managed by Heroku instead of the addon for Amazon RDS for MySQL, but I'm not so confident without the possibility to access my data in a SQL client... I know that in a well made app you have no need to access DB, but there are some situations (add rows to a config table, see data not mapped in a view, update some columns for debugging issues, performance monitoring, running queries for reporting, etc.) when this can be good... How do you solve this problem? What's you experience in a real life app powered by Heroku? Thanks!

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  • Low Throughput on Windows Named Pipe Over WAN

    - by MichaelB76
    I'm having problems with low performance using a Windows named pipe. The throughput drops off rapidly as the network latency increases. There is a roughly linear relationship between messages sent per second and round trip time. It seems that the client must ack each message before the server will send the next one. This leads to very poor performance, I can only send 5 (~100 byte) messages per second over a link with an RTT of 200 ms. The pipe is asynchronous, using multiple overlapped write operations (and multiple overlapped reads at the client end), but this is not improving throughput. Is it possible to send messages in parallel over a named pipe? The pipe is created using PIPE_TYPE_MESSAGE, would PIPE_READMODE_BYTE work better? Is there any other way I can improve performance? This is a deployed solution, so I can't simply replace the pipe with a socket connection (I've read that Windows named pipe aren't recommended for use over a WAN, and I'm wondering if this is why). I'd be grateful for any help with this matter.

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  • I (stupidly) converted a TrueCrypt encrypted disk to GPT in Disk Management: now TrueCrypt won't mount it

    - by asilentfire
    Backstory: After moving a Macrium Reflect disk image from my TrueCrypt external drive (with whole disk encryption) onto a unencrypted drive and using Windows PE with Macrium Reflect to restore my internal disk to the recovery image on the external unencrypted drive, my Windows 8 failed to boot. I then went back and also recovered the System Partition (looking now, it is currently EFI), but I still couldn't boot into my backup.. I was in a hurry to get online for something so I just did a clean install of Windows 8, without the backup.. After I installed Windows 8, I went into Disk Management out of curiosity to see if there were other partitions with Windows 8 that Macruim might have missed, and there is (by default) a Recovery Partition of 100MB. My memory of this is hazy, as I was trying to get up and running for an exam at 4 AM: Something in Disk Management prompted me to convert my encrypted external drive to GPT.. I have no idea why I did this, but I went ahead and allowed it to convert my TrueCrypt drive to GPT. Now, I can't mount the drive in TrueCrypt.. Disk Management sees it as Disk 1, Basic, and Unallocated. I tried converting it back to MBR with Disk Management, but no dice with TrueCrypt :( If I try to mount the disk in TrueCrypt I get the message: Incorrect password or not a TrueCrypt volume I should never have messed with a Truecrypt drive in Disk Management, but I did. I have important college work in that drive, and fear I have lost it forever. PLEASE HELP

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  • Access MacZFS via network from XBMC

    - by AreusAstarte
    I have a ZFS RAID (zpool with three drives) hooked up to my Mac that I want to share in my LAN so that the XBMC client on my OUYA console hooked up to the television can read the drive and use it to stream my movies and television shows onto the television set. I've searched around for a bit but so far haven't found anything that helped me with it. I know that when connecting to the Mac with SSH I can't just access the drive due to different formatting. What do I have to do so that XBMC will be able to read it? How do I share it?

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  • Eclipse version in Debian package directories too old. Alternatives to manual install?

    - by Håvard Geithus
    Ian Murdock, the founder of Debian, has commented that package management is "the single biggest advancement Linux has brought to the industry". (Wikipedia) But for some reason I'm forced to install eclipse manually if I want the most recent version, rather than the ancient eclipse 3.5.2 from the Debian package directories. Why? Is there a more convenient way to get the newer version? (I know the manual install is very little work, but I still think it should be unnecessary)

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  • Network Performance issue

    - by qubemarker
    We have three Ubuntu 10.04 servers. One server is a storage server and the other two servers are configured as clients. The storage server has a good amount of capacity and it is integrated with windows Active directory server for Authentication. I am uploading some video files from both clients to the server and when I am uploading data from any one client alone I get about 26 MB/s data transfer rate. When I upload data from both the clients simultaneously I am only getting about 8 MB/s from each client. I have gigabit ethernet cards in all of the servers and a L2 Managed gigabit switch for connectivity. I don’t know why the data transfer rate is decreasing so much in simultaneous read and write. I have tried all of the TCP stack related settings suggested here. Can any assist with getting better read/write performance out of this setup? Any help is appreciated.

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  • Using a Data Management Singleton

    - by Dan Ray
    Here's my singleton code (pretty much boilerplate): @interface DataManager : NSObject { NSMutableArray *eventList; } @property (nonatomic, retain) NSMutableArray *eventList; +(DataManager*)sharedDataManager; @end And then the .m: #import "DataManager.h" static DataManager *singletonDataManager = nil; @implementation DataManager @synthesize eventList; +(DataManager*)sharedDataManager { @synchronized(self) { if (!singletonDataManager) { singletonDataManager = [[DataManager alloc] init]; } } NSLog(@"Pulling a copy of shared manager."); return singletonDataManager; } So then in my AppDelegate, I load some stuff before launching my first view: NSMutableArray *eventList = [DataManager sharedDataManager].eventList; .... NSLog(@"Adding event %@ to eventList", event.title); [eventList addObject:event]; NSLog(@"eventList now has %d members", [eventList count]); [event release]; As you can see, I've peppered the code with NSLog love notes to myself. The output to the Log reads like: 2010-05-10 09:08:53.355 MyApp[2037:207] Adding event Woofstock Music Festival to eventList 2010-05-10 09:08:53.355 MyApp[2037:207] eventList now has 0 members 2010-05-10 09:08:53.411 MyApp[2037:207] Adding event Test Event for Staging to eventList 2010-05-10 09:08:53.411 MyApp[2037:207] eventList now has 0 members 2010-05-10 09:08:53.467 MyApp[2037:207] Adding event Montgomery Event to eventList 2010-05-10 09:08:53.467 MyApp[2037:207] eventList now has 0 members 2010-05-10 09:08:53.524 MyApp[2037:207] Adding event Alamance County Event For June to eventList 2010-05-10 09:08:53.524 MyApp[2037:207] eventList now has 0 members ... What gives? I have no errors getting to my eventList NSMutableArray. But I addObject: fails silently?

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  • Programmatically reconnect to wifi network

    - by ya23
    Sometimes I work with frequently-dropping wifi connections. I can either reconnect manually or wait some time (varies from few seconds to few minutes) before windows attempts to reconnect. Is there a simple way to trigger reconnect immediately after the connection was dropped? Bonus question: In this particular case I'd blame hardware, but how can I diagnose the reason of dropping connection in general?

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