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• Wireless router bandwidth with multiple clients.

  - by ULTRA_POROV

  Suppose a wireless router has a bandwidth of 54 mbs. Does this mean that 2 clients (pc's) that are connected to the router can both transfer data at 54 mbs simultaneously or will the bandwidth be spitted equally among them (27mbs each)?

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• Image storage social network (Host plan)

  - by Samir

  I'm wondering what the best way is to host images on a social network site. Let's say that I expect my social network to reach 500.000 users in 2 years time. That would mean that if every user uploaded about 100 images and every image is 1 MB that I will have to need: 500.000 * 100 * 1 MB = 50.000.000 MB which means 50 terabytes. I'm not sure how I can best setup my hosting plan in order to have a solid bases to store my images and eventually store video files as well. Which hosting plan would you recommend me to start with and how can I enhance the plan?

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• Can I share my cable internet connection through my ADSL wireless router?

  - by Roaders

  Hi All Over the xmas period I am at my in-laws. They have Virgin Broadband (cable) and have a basic modem / router that is plugged directly into their computer using an ethernet cable. My wife and I arrived with 5 PCs! (ok, one is a gift and won't be used) 4 of which are laptops so I would like to be able to use their internet connection. At the moment I am working so have plugged the ethernet cable into my work laptop. Rebooting the router meant that my work laptop now has internet. I have my ADSL Netgear router which is wireless. I tried plugging it in between the router and the PC but I didn't seem to be able to share the internet connection wirelessly. The original PC still had internet despite ony being connected to my router but my wireless laptop didn't have a connection. My old cable router had an internet ethernet port on the back that the modem plugged into. My ADSL router doesn't, it has a phone connection socket. Is there a way of doing what I want with the equipment I have? Thanks

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• TTL and traceroute showing different values for same domain

  - by Cray XT3

  y am i getting two different output for tracert and ping. Ping Result showing total hops of 20 and tracert showing 8. default ttl value on my linux machine 64,icmp echo reply ttl value 44. 64-44=20 but tracert is showing only 8 hops. What can be the reason? If tracert is implemented using ttl then why am i getting different values for same domain.no matter how many times i tried. Fo google and google services,ttl value and tracrt are same,but for other domains its different.

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• Open ports for Apache Tomcat-7.0.32 on Linux Mandriva

  - by ivanov-void

  I installed Apache Tomcat-7.0.32 on Linux Mandriva and I want to make it accessible. for this I need to open ports in iptables. I added the following rules- iptables -A INPUT -p tcp -m tcp --dport 8081 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8010 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8444 --syn -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 8006 --syn -j ACCEPT then save and restart iptables - /etc/init.d/iptables save /etc/init.d/iptables restart verify, that ports is open - netstat -tulpn | less I am running command - netstat-ntpl | grep java and see - When I disable the firewall, I see the start page of the server on request - http://server_ip:8081/ When enable - server not accessible from outside. In what may be the cause? I would be most grateful for the information! Thank you!

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• how to change interface ip in ifconfig with /etc/network/interfaces

  - by user2478348

  Hi everybody when modifiying /etc/network/interfaces, saving it and then executing ifconfig i can't see the modification i made..for example here is part of my /etc/network/interfaces: auto wlan1 iface wlan1 inet static address 192.168.0.60 netmask 255.255.255.0 gateway 192.168.0.61 you can see that the IP address of my wlan1 is 192.168.0.60 but when typing ifconfig i have this: wlan1 Link encap:Ethernet HWaddr 00:19:70:0f:c2:9c inet adr:192.168.0.1 Bcast:192.168.0.255 Masque:255.255.255.0 adr inet6: fe80::219:70ff:fe0f:c29c/64 Scope:Lien UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Packets reçus:758 erreurs:0 :0 overruns:0 frame:0 TX packets:610 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:1000 Octets reçus:73490 (73.4 KB) Octets transmis:127883 (127.8 KB) (the inet adr:192.168.0.1 and not 198.168.0.60)..if someone can help me I'll be very thankful :)

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• Trouble Connecting to Virtual Machine after IP address Change

  - by David

  I have a VMware image running a copy of Fedora 11 which is hosted on a remote server. The remote server recently had its IP address change. I'm now unable to connect to my virtual machine. The server admin assures me that my virtual machine is running and assigned the new IP address. I have checked the firewalls and had the remote admin restart the VM instance. Neither of these fixed the problem. How do I troubleshoot a remote server which I am unable to SSH to? I'm actually even unable to ping the remote IP (connection timed out).

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• How do I get the IP Adress of my vpn server

  - by kashif

  I Connect to internet using PPTP connection type from my computer using following setting internet address: blue.connect.net.pk user id: myusername password: mypassword my problem: my dwr-112 router doesn't support internet address name, it rather supports only ip address of the server i.e I'm not able to type blue.connect.net.pk as it only supports server's ip adress. my question: How can I know the ip address of vpn server so that I can configure my dwr-112 router to connect to internet using pptp connection type

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• How to connect 2 routers (Asmax and D-link)

  - by piobyz

  I just bought a new router, D-link DSL 2641B and want to connect it to another one, provided by my ISP, Asmax AR 804MP. Previously, I had Linksys WRT350N, and there was no problem, while I had Ethernet cable plugged in to one of LAN ports in Asmax and INTERNET(RJ45) port in Linksys, connection used PPPoE protocol -- worked OK. D-link has DSL(RJ11) port (which I don't want to use as Asmax replacement, while there is a separate Ethernet cable with a TV plugged to Asmax, which I don't want to configure from scratch on D-link). How should I connect my new D-link to work with Asmax? Via DSL port? Via one of the LAN ports (in which case I probably should change the purpose of this port in the config, I guess?). I tried connecting D-link both ways: LAN(ASMAX) to LAN(DLINK) LAN(ASMAX) to DSL(DLINK) (using RJ11 - RJ45 cable) I hope there is some setting in the DLINK's config that I overlooked. I haven't tried to see what's in ASMAX's config, but I guess I don't need to change anything there, while Linksys worked just fine? The only difference I see, is that D-link has RJ11 DSL port as WAN, and Linksys has RJ45 (called by them INTERNET) as a main WAN port.

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• CISCO Router configuration

  - by Acharf

  Hey, I'm looking for a course of CISCO Commandes to configure a router. Is there anyone that can help ?

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• How to reliably keep an SSH tunnel open?

  - by Peltier

  I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken. If I could at least monitor the tunnel automatically, I could restart the tunnel when it hangs, but I haven't even figured a way of doing that. Bonus points for the one who can tell me how to prevent my ssh connection from hanging, of course!

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• Linux servers seeing bad download performance behind Sonicwall firewall

  - by Joshua Penix

  I'm working with a pair of co-located CentOS Linux servers sitting behind a Sonicwall PRO 2040 Enhanced firewall running in transparent bridge mode. These servers are having a strange problem downloading files more than a few megabytes in size. For example, if I try to wget or FTP a copy of the Linux kernel from kernel.org, the first ~1-2MB will download at 600+K/s, and then throughput will drop off a cliff to 1K/s. I've reviewed all the firewall configuration settings for anything suspicious, but found nothing. More interestingly, I performed the same download with a Windows server sitting behind the same firewall, and it sailed right through at 600+K/s the whole way. Has anyone seen this? Where should I start looking to troubleshoot this problem?

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• What software is used by buy-side investment companies?

  - by user44995

  What software is used by buy-side investment companies? For educational purposes, could anyone describe IT infrastructure of a typical buy-side investment company: a hedge fund, a mutual fund or a wealth management company. No particular details are needed, just what type of software is used how different software modules interact with each other. Am I asking too much?

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• XP/Intel wirelss only showing 'hpsetup' ad-hoc network that isn't there

  - by ewall

  Trying to help my friend with her work XP laptop, which recently stopped seeing any wireless SSIDs except the SSID 'hpsetup' (presumably from a wireless-enabled HP printer). Relevant information: The laptop is a Lenovo T500 (Centrino 2 chipset) with XP SP3. The network adapter is Intel WiFi Link 5300 AGN (built-in). The latest version (13.5) of the Intel drivers only are installed, not the Intel config software, so XP is using the Wireless Zero-Config manager. The wireless router is a NetGear WGR614 v7 with 802.11b/g. The SSID is broadcasting, and all the other laptops in the house can see and connect to it. On the laptop, I have tried repairing the network connection, disabling power management, turning off 802.11a & n radio, and more... but it didn't help. Some of the wireless settings are managed by Group Policy from her office (I get the "At least one of your changes was not applied successfully to your wireless configuration" message). It is enforced to connect to "Access point (infrastructure) networks only". The real kicker is that my laptop does not an SSID named 'hpsetup' here, but it can see several broadcasted SSIDs including the one we want, while my friend's laptop doesn't see any SSID except 'hpsetup'. Any suggestions?

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• Cannot open any web page, but MSN Messenger works

  - by Steven

  I use my computer behind a router. My MSN program can connect to the Internet, but I can not open any web site with my web browser. It seems that this problem is related to DNS because when I input an IP address directly in the address bar of my web browser, the web page can be displayed. However, I don't know how to fix this problem. I choose Google Public DNS server on my computer, this problem still exists. My OS is windows XP. How to fix this problem? Any ideas?

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• Music Streaming Devices

  - by Skizz

  I'm looking for peoples opinion on wireless music streaming devices - something like this. I have an iTunes library hosted on an ubuntu server and I'm looking for something to allow me to listen to all the albums stored on it. Ideally, it should provide a good quality playback both over headphones and through speakers so that everyone can hear it. It doesn't need to be ultra-portable - being able to move the system and plug in a mains lead should be enough, so a single, integrated unit is preferable. One product per answer please and if you've used a product, vote it up or down depending on whether it's any good or not. Use comments to highlight good/bad points.

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• Wireless bridge between two prolink adsl modem/router

  - by MyName

  Allright, so i've got 2 prolink hurricane h5004n. Its a broadband adsl modem and router. My Pc is connected to the first one via ethernet. What i want to do is a wireless bridge to make the 2 routers "talk". I've tried hooking up the dsl cable (as they are modems) in both to try but when one disconnects as the other connects. I don't really know about the configurations to be done of all the DCHP or RIP and NAT forwarding stuffs. (i'm just writing what i saw) In short i want the second router to act as a wifi repeater but i don't see any repeater option and i also do not want to connect them via ethernet. So is it possible to do something? Apart from buying another repeater i don't want to spend anymore i'm done :S

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• if an outdated, vulnerable but clean Windows machine is connected to network behind router, can it be detected and attacked?

  - by EndangeringSpecies

  suppose the machine is clean of all malware but not in any sense updated, patched, secured etc. Suppose I connect it to the internet from behind wireless router with the intent of using it only on a few trusted sites and only there. Or, for the sake of argument, maybe I wouldn't do any browsing at all, just let it sit there connected to the network. This is all happening in a residential situation with cable internet. In this situation can a remote attacker somehow detect the fact that the machine is connected to the internet and try connecting to do an exploit?

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• Stress test a server for simultaneous connection

  - by weston smith

  I am trying to figure out a practical way to stress test a server for 300 to 600 simultaneous connections. Any advice? Thank you everyone for the help. To be more specific (sorry I wasn't before) this is a Flash Media Server on AWS that will be streaming live video. I've been having problems with the video freezing/buffering for everyone and I need to verify if its on the user end, upload end, or server end. I mainly need help with stress testing the server with 300-600 multiple request before going live.

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• infiniband network between 3 servers

  - by grumpf

  Let's say I have 3 different servers, each one with an infiniband card. Each card has 2 different ports. (I don't know about the model yet) Is it possible to create 3 different networks and to allow the 3 servers to communicate with each other without any problems? (and any spof). I guess I just have to setup the /etc/hosts correctly. I really don't know about infiniband, so please help me :) Thanks in advance. EDIT: Point is to NOT USE a switch!

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• Presentation software requires admin rights to install - any way to remove this requirement?

  - by James F

  I have some wireless presentation software which I use in a meeting room in order to allow end users to hold presentations here and wirelessly have their laptop screens showing on the TV on the wall. Unfortunately the .exe file requires admin rights to install therefore requiring that either the user requests temporary admin rights beforehand, I install it using my admin account or that we use a VGA/HDMI cable. Is there a way to remove the admin right requirement from a .exe or a .msi file so that it can be installed freely by any user? We are using XP for now but will be moving to 7 soon. Thanks James

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• Waht are the best proxy servers for Mikrotik router?

  - by niren

  I want to setup proxy server for my Mikrotik router. There is inbuilt web-proxy for Mikrotik router but I can extend this upto transparent proxy(kind of proxy server) only. We need High anonymity proxy so that we can hide our LAN static IPs(we don't have private IP) from outside Intruder/hackers. And also I know I can setup NAT rule to hide our IP(only private IP not public/static IP) as per this link, but I cann't hide static/public IP. Essentially I want to hide our Public/Static IP (there is static/public IP for all systems in our company) from outside Internet. To achieve this I guess I need other software apart from Mikrotik router gateway setup. can anyone suggest me Is there any other software to achieve my requirement? I know about squid proxy but am not sure whether It can hide our static/public IP. Note: we have assigned public/Static IP to all systems of our company since we have rights to access our company's system from anywhere by dedicated laptop(given by our company with more security) through VPN connection.

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• Traceroute to IP address fails, but traceroute to domain name with same IP address is okay. Why?

  - by tomo

  When I traceroute to this IP (108.162.198.181) it stops after 1 hop. But tracerouting to a domain (www.gomodule.com) with the same IP shows 9 hops ending in that target. traceroute to www.gomodule.com (108.162.198.81), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 131.667 ms 48.532 ms 48.837 ms 2 118.69.255.124 (118.69.255.124) 91.521 ms 79.177 ms 30.679 ms 3 42.117.11.225 (42.117.11.225) 30.270 ms 32.091 ms 29.698 ms 4 118.69.253.213 (118.69.253.213) 32.234 ms 118.69.253.237 (118.69.253.237) 70.667 ms 118.69.253.213 (118.69.253.213) 82.440 ms 5 118.69.253.245 (118.69.253.245) 64.554 ms 80.277 ms 130.224 ms 6 118.69.251.205 (118.69.251.205) 65.635 ms 118.69.249.78 (118.69.249.78) 133.234 ms 118.69.251.205 (118.69.251.205) 224.111 ms 7 118.69.251.249 (118.69.251.249) 156.679 ms 111.965 ms 64.165 ms 8 cloudflare1-rge.hkix.net (202.40.160.246) 64.102 ms 64.498 ms 74.581 ms 9 108.162.198.81 (108.162.198.81) 66.873 ms 67.426 ms 69.054 ms -vs- traceroute to 108.162.198.181 (108.162.198.181), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 96.588 ms 3.003 ms 4.976 ms 2 118.69.255.124 (118.69.255.124) 45.223 ms 31.449 ms 31.225 ms 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * ...

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• Windows XP does not list WPA wireless networks

  - by Tomalak

  What can be the reason that Windows XP does not show WPA-encrypted wireless networks? The laptop I have problems with is an older model (Toshiba Satellite Pro 6100) with Windows XP SP3 on it, fresh install. The wireless network card in it is an Agere product that lists as "Toshiba Wireless LAN Mini PCI Card". The networks showed up perfectly before I first tried to connect to one (it was set to WPA2). The connection failed (the card supports WPA only), then something must have happend and Windows hides these networks now. A manually configured WPA setup via Windows' own wizard works, I'm using it right now. The network just won't show up in the list of available network on its own. I suspect that XP incorrectly set a flag somewhere that this network card does not support WPA. Is there such a flag, and if so, how can I change it back?

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• Connect multiple WiFi networks simultaneously

  - by Tamir

  Hi all :-) I thought about connecting multiple WiFi networks simultaneously in order to leverage my bandwidth. I heared about "VirtualWifi" which is abandon by MS research. I have new Intel WiFi chipset (6200) and Win7 (64bit). Can I do such of thing somehow? Many thanks for your answers! Tamir

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