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  • Setting up router: I can get online via Ethernet, and I can connect to router wirelessly, but can't

    - by Gabe
    I'm setting up a new D-Link N300 router, and trying to connect a MacBook Pro and a MacBook, both running OS X 10.6. As the question says, either computer can connect to the internet when connected to the router via Ethernet. And either one can get on the router's wireless network. But when connected wirelessly (without the Ethernet cable plugged in), neither one can get online. I can't figure out why that would be. Any help appreciated.

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  • Managing an application across multiple servers, or PXE vs cfEngine/Chef/Puppet

    - by matt
    We have an application that is running on a few (5 or so and will grow) boxes. The hardware is identical in all the machines, and ideally the software would be as well. I have been managing them by hand up until now, and don't want to anymore (static ip addresses, disabling all necessary services, installing required packages...) . Can anyone balance the pros and cons of the following options, or suggest something more intelligent? 1: Individually install centos on all the boxes and manage the configs with chef/cfengine/puppet. This would be good, as I have wanted an excuse to learn to use one of applications, but I don't know if this is actually the best solution. 2: Make one box perfect and image it. Serve the image over PXE and whenever I want to make modifications, I can just reboot the boxes from a new image. How do cluster guys normally handle things like having mac addresses in the /etc/sysconfig/network-scripts/ifcfg* files? We use infiniband as well, and it also refuses to start if the hwaddr is wrong. Can these be correctly generated at boot? I'm leaning towards the PXE solution, but I think monitoring with munin or nagios will be a little more complicated with this. Anyone have experience with this type of problem? All the servers have SSDs in them and are fast and powerful. Thanks, matt.

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  • How to share computer's internet connection among network users

    - by RBA
    I wanted to connect to internet from my mobile through laptop wireless-broadband internet connection.. For that I have gone to Network Places, there i have done appropriate settings for "Wireless Network Connection" and "Bluetooth Personal Area Network Connection",, but that Bluetooth connection is still not showing connected.. I have checked the option for "Allow other network users to connect through this computers Internet connection", but still my Bluetooth Connection is still showing not connected.. Please help me out,, as to how can i achieve the same,, as i am having Broadband internet connection, which comes wirelessly to my laptop through a router/modem..

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  • VPN - Accessing computer outside of network. Only works one way

    - by Dan
    I could use some help here. My ideal goal is to create a VPN for 2 macs that are in different locations so that they can share each others screens and share files. I basically want to do what Logmein's Hamachi does, but without the 5 user limitation. I have set up the VPN on my Synology NAS at my house using the PPTP protocol. I could also use OpenVPN. The good news is that I can use a laptop outside of my home network to access any computer on my network at my house. The bad news is that I can not do the reverse. I want to use a computer in my home network (same network as the VPN server) to access a computer outside of my network (which is connected via VPN successfully). My internal IP is 192.168.1.xxx PPTP VPN assigns my laptop that is outside of my network with 192.168.5.xxx, but when I try to access it remotely either with afp://192.168.5.xxx or vnc://192.168.5.xxx I can't connect using either. Is this something that I should be able to do or is VPN only one way? I've also tried openvpn with the same results. Thanks for any help! -Dan

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  • Wireless connection switches off IP address

    - by Sanjay Gupta
    I have a Lenovo laptop with windows XP and a wireless connection at home. The wireless connection works when initially I switch on the computer. but if I leave it for even 5 minutes, the wireless is gone. Then I have to shut it off and start computer all over again, waiting for 5 minutes. Even if the wireless speed is 48Mbps or better, it gives the message "Renewing IP address" and gets stuck there not moving to the next stage. Other laptop in the household works fine and can be left on. Why does this happen ? I suspect that IP address is the problem and somehow is not registered in all the necessary files.

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  • Network topology question

    - by Asbie
    We currently have three networks, X.X.163.1, X.X.93.1 and 192.168.1.1. Today's setup is like this: http://i.imgur.com/tkKWy.jpg We now have PPT VPN from internet to the X.X.163.1-network, but really need to access the files from the File Server through VPN. I am also aware that this setup is not optimal. So please, any advices on how to redesign our network? Rack servers are mostly web and db servers, with only public IP addresses.

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  • When browsing a specific network share remotely, Windows Explorer continuously jumps back to the parent folder

    - by Evil Pigeon
    I am accessing a specific network path on another domain. It looks something like this: \\CoputerName.OtherDomain.in\c$\Inetpub\Testing\Website\ In under 30 seconds, I am automatically jumped back to \\CoputerName.OtherDomain.in\c$\Inetpub\Testing\ In less time it then jumps back to \\CoputerName.OtherDomain.in\c$\Inetpub\ Then it jumps back to c$ for its final resting place. \\CoputerName.OtherDomain.in\c$\ At first I thought this had to with a faulty keyboard, but this behaviour also occurs when the window does not have focus. It's as if windows thinks that the folder no longer exists (as in someone else has deleted or moved it). This behaviour is not specific to my PC either, it occurs from other machines in the office. Edit: It looks like this issue only occurs from other Windows 7 machines. There are no issues accessing the path from XP.

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  • traffic shaping for certain (local) users

    - by JMW
    Hello, i'm using ubuntu 10.10 i've a local backup user called "backup". :) i would like to give this user just a bandwidth of 1Mbit. No matter which software wants to connect to the network. this solution doesn't work: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 iptables -t mangle -A POSTROUTING -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 tc qdisc del dev eth0 root tc qdisc add dev eth0 root handle 2 htb default 1 tc filter add dev eth0 parent 2: protocol ip pref 2 handle 50 fw classid 2:6 tc class add dev eth0 parent 2: classid 2:6 htb rate 10Kbit ceil 1Mbit tc qdisc show dev eth0 tc class show dev eth0 tc filter show dev eth0 does anyone know how to do it? thanks a lot in advance

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  • Log website performance client side.

    - by NitroxDM
    I have a client that is have an issue (it's slow) with a website on one of my servers. The server is a windows 2003 box running WebSphere 6.1. I can't find anything in the logs that would indicates an issue. Is there some free software out there that can help me figure out why the site is slow on the client's end? The client has an IT department, but I need to be sure it's not my side of things.

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  • Correct way of bringing network interface down in linux

    - by Karolis T.
    For example: $ ifconfig dummy0 up $ ifconfig dummy0 "192.168.1.190 netmask 255.255.255.0" Calling ifconfig with no parameters shows the interface dummy0 Link encap:Ethernet HWaddr b6:1f:f3:92:6d:20 inet addr:192.168.1.190 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::b41f:f3ff:fe92:6d20/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:1050 (1.0 KiB) How can I bring the interface down so that it doesn't show up in ifconfig ifconfig -a ifconfig dummy0 without rmmod dummy because dummy is used just for example purposes. If there is no way to do that, what "throw-away" IP could I set to it and be safe from any trouble? like $ ifconfig dummy0 down $ ifconfig dummy0 0.0.0.0

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  • debian gateway using iptables

    - by meijuh
    I am having problems setting up a debian gateway server. My goal: Having eth1 the WAN interface. Having eth0 the LAN interface. Allow both ports 22 (SSH) and 80 (HTTP) accessed from the outside world on the gateway (SSH and HTTP run on this server). What I did was the following: Create a file /etc/iptables.rules with contents: /etc/iptables.rules: *nat -A POSTROUTING -o eth1 -j MASQUERADE COMMIT *filter -A INPUT -i lo -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -i eth1 -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -i eth1 -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -i eth1 -j DROP COMMIT edit /etc/network/interfaces as follows: /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback pre-up iptables-restore < /etc/iptables.rules auto eth0 allow-hotplug eth0 iface eth0 inet dhcp #auto eth1 #allow-hotplug eth1 #iface eth1 inet dhcp allow-hotplug eth1 iface eth1 inet static address 217.119.224.51 netmask 255.255.255.248 gateway 217.119.224.49 dns-nameservers 217.119.226.67 217.119.226.68 Uncomment the rule net.ipv4.ip_forward=1 in /etc/sysctl.conf to allow packet forwarding. The static settings for eth1 such as the ip address I got from my router (which I want to replace); I simply copied these. I have a (windows) DNS + DHCP server on ip address 10.180.1.10, which assigns ip address 10.180.1.44 to eth0. What this server does is not really interesting it only maps domain names on our local network and assigns one static ip to the gateway. What works: on the gateway itself I can ping 8.8.8.8 and google.nl. So that is okey. What does not work: (1) Every machine connected to eth0 (indirectly via a switch) can not ping an ip or a domain. So I guess the gateway can not be found. (2) Also when I configure my linux machine (a laptop) to use a static ip 10.180.1.41, a mask and a gateway (10.180.1.44) I can not ping an ip or domain either. This means that maybe my iptables is incorrect of not loaded correctly. Or I maybe have to configure my DNS/DHCP on my windows machine. I have not reset the windows machine net, restart the DNS/DHCP services, should I do this? I did not install dnsmasq as desribed here: http://blog.noviantech.com/2010/12/22/debian-router-gateway-in-15-minutes/. I don't think this is necessary?

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  • How do I configure a secondary gateway in RHEL5?

    - by Brett Ryan
    Greetings, we have been experiencing a random timeout issue with VPN users connecting to one of our servers which is causing a problem. My network administrator has instructed me to configure a secondary gateway to include the VPN connection. My current connection resides as follows, 10.1.9.1 is the internal gateway to the internet, I'd like to add 10.1.1.20 as the VPN gateway. # Broadcom Corporation NetXtreme II BCM5708S Gigabit Ethernet DEVICE=eth0 BOOTPROTO=none BROADCAST=10.1.255.255 IPADDR=10.1.1.22 IPV6_AUTOCONF=yes NETMASK=255.255.0.0 NETWORK=10.1.0.0 ONBOOT=yes GATEWAY=10.1.9.1 TYPE=Ethernet USERCTL=no IPV6INIT=no PEERDNS=yes

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  • Browser caching is generating hugo I/O to server

    - by Rime
    Our users My Documents are stored on a Emc NAS. I have noticed huge traffic coming from users and I see that most of it is coming to cache directories of Internet Explorer and other browsers. One thing i suspect is Adobe Flash caching streams. We have various Windows clients and no restrictions on browsers. Is there any way to remove this traffic from our NAS by a group policy or whatever? Thanks Rime

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  • Does an unmanaged 4/8-port GBit Ethernet switch with a GBIC port exist?

    - by Aaron Digulla
    I'm looking for a simple unmanaged switch with 4-8 GBit Ethernet ports and a fiber port (either as a GBIC slot or pre-installed with a 1000BASE-SX port). Does something like that exist? [EDIT] I want to connect to places in my home without drilling large holes though the floors. Therefore, I'm looking for a cheap way to connect two GBit switches via fiber. I tried with a media converter (GBit <- multimode fiber) but that costs about 50% throughput. So I was hoping that there is a cheap, small GBit switch which has a GBIC slot). All I found so far are very expensive managed switches with 12 or 24 ports for industry use.

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  • Router block some sites

    - by Mahesha999
    Hi I was using ADSL Modem/Router earlier. The device is quite old Pronet PN-ADSL 101 E/U model (pics: http://bit.ly/P2YaWy, http://bit.ly/OA700l) Since it had only one RJ45 out, I bought new Wireless Router TPLink TL-WR941ND. It has 4 RJ45 out and 3 wireless antennas. I configured my old router in bridge. Now, if I have to connect my pc to Internet through the old router, I have to enter username and password. Then I connected the RJ45 output of old router to the WAN in of new router. and ran the CD of new router. It configured the new router in PPPoE by saving the username and password in router to dial automatically. So now I have to just plug in the wires in my new routers any RJ45 out. I am able to access the Internet when I connect through new router (both wired and wirelessly), but some sites are getting blocked. Most notably yahoo.com (though ymail.com is working), Microsoft.com. msn.com. These sites work perfectly fine when I connect my pc directly to my old router and enter username and password manually. (However others like google.com. facebook.com works fine when connect through new router) So here these some sites need some parameter set but I am unable to find them out. Can anyone help me. My friend said he also faced same problem. Surprisingly he advised me to see if the same websites will work through Opera turbo mode and boom they worked. So what could be the problem?

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  • Right Clicking Network File Very Slow Over VPN

    - by Reafidy
    I am having real troubles with a VPN connection. The VPN connection is not used for a internet connection just for file browsing. File browsing is slow, taking about 3-4 seconds to bring up a list of folders. I can live with this, however the problem is when I right click on a file. Sometimes the right click menu comes up instantly but sometimes it brings up the wait icon for anywhere between 30 seconds to a few minutes before displaying the menu. I ran speedtest.net and the results were: 3.08 Down/0.13 Up (Mbps) 0.13Mbps = 16kbps upload. So I am not experiencing miracles with opening files. A 120kb file can take anywhere from 5 to 30 seconds. Sometimes transfering/opening files happens as expected other times its slow but the real issue is with the right click as mentioned. Anyone have any ideas? Using PPTP Clients are all windows 7 pro

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  • Windows 2008 R2 Servers Sending Arp Requests for IPs outside Subnet

    - by Kyle Brandt
    By running a packet capture on my my routers I see some of my servers sending ARP requests for IPs that exist outside of its network. For example if my network is: Network: 8.8.8.0/24 Gateway: 8.8.8.1 (MAC: 00:21:9b:aa:aa:aa) Example Server: 8.8.8.20 (MAC: 00:21:9b:bb:bb:bb) By running a capture on the interface that has 8.8.8.1 I see requests like: Sender Mac: 00:21:9b:bb:bb:bb Sender IP: 8.8.8.20 Target MAC: 00:21:9b:aa:aa:aa Target IP: 69.63.181.58 Anyone seen this behavior before? My understanding of ARP is that requests should only go out for IPs within the subnet... Am I confused in my understanding of ARP? If I am not confused, anyone seen this behavior? Also, these seem to happen in bursts and it doesn't happen when I do something like ping an IP outside of the network. Update: In response to Ian's questions. I am not running anything like Hyper-V. I have multiple interfaces but only one is active (Using BACS failover teaming). The subnet mask is 255.255.255.0 (Even if it were something different it wouldn't explain an IP like 69.63.181.58). When I run MS Network Monitor or wireshark I do not see these ARP requests. What happens is that on the router capturing I see a burst of about 10 requests for IPs outside of the network from the host machine. On the machine itself using wireshark or NetMon I see a flood of ARP responses for all the machines on the network. However, I don't see any requests in the capture asking for those responses. So it seems like maybe it is maybe refreshing the arp cache but including IPs that outside of the network. Also when it does this NetMon doesn't show the ARP requests?

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  • Simulating a low-bandwidth, high-latency network connection on Linux

    - by Justin L.
    I'd like to simulate a high-latency, low-bandwidth network connection on my Linux machine. Limiting bandwidth has been discussed before, e.g. here, but I can't find any posts which address limiting both bandwidth and latency. I can get either high latency or low bandwidth using tc. But I haven't been able to combine these into a single connection. In particular, the example rate control script here doesn't work for me: # tc qdisc add dev lo root handle 1:0 netem delay 100ms # tc qdisc add dev lo parent 1:1 handle 10: tbf rate 256kbit buffer 1600 limit 3000 RTNETLINK answers: Operation not supported How can I create a low-bandwidth, high-latency connection, using tc or any other readily-available tool?

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  • Mac internet problems

    - by Bradley Herman
    Our office is set up with mostly macs (7 of them) but we do have a windows laptop and a windows desktop on the network as well. The network is configured with a modem going into a switch/router throughout the office to the computers, along with a wireless router. Everything runs fine most of the time, but periodically while using the web, certain sites will stop loading and timeout repeatedly. This usually lasts 20 minutes or so and can be incredibly annoying. Resetting the modem/router and/or rebooting the computer never helps. The weirdest part is that in almost every case, the websites are fine on our Windows machines. I frequently use github, google, Stack Overflow, and jQuery reference and I can count on the sites being unavailable to me at least once a day. While I can't get them to load, I can spin my chair around to the windows server behind me and load the sites just fine. Any idea what the hell could be going on here?

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  • Ubuntu Laptop as a wireless hotspot on bridge mode

    - by nixnotwin
    I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo hostapd /etc/hostapd/hostapd.conf & sudo dhclient -d br0 & sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up sudo brctl addif br0 wlan0 These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).

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  • Server hard disk read speed and client download speed, is there a connection? [closed]

    - by Mywiki Witwiki
    Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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