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• How to get the speed of a network card on the command line?

  - by nelaar

  I am trying to see what the speed of some network cards on a remote server. Our reporting software says they are 10Mbps, but I am sure that is wrong they should be 1Gbps. Our monitoring software uses SNMP to query the servers, perhaps the servers are reporting information incorrectly. ifconfig does not report what the speed of the devices are. How can I see what the currently configured speed of the cards are.

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• WLC 4400. Get IP

  - by Edward Connelly

  I have three SSID. one is a guest network and I'm having problems with lease times. Its set for web authentication so it passes IPs out even if someone doesn't try and authenticate. Is there a way to get that IP back and not hand another to that mac for a period of time? Poor planning and we didn't allocate enough address space, and we are sandwitched. We could go with another address, but we would have to reconfig lots. since its guest its vlan'd with no access to anthing but the firewalls. would have to change ACLs and routes and interfaces. if it isn't possible we will just have to go that route, just thought there might be an easier solution. session timeout is enabled with 1 hr lease time is set to 4 hrs. no helper DHCP and internal DHCP is set with the space split across three WLCs (60 waps split across those as well).

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• 2 Computers, same network, different outgoing speeds when uploading to internet?

  - by user117339

  I have 2 work machines in my office, a PowerMac G5 and a MacBook Air. Both behind an IPCop firewall. The PowerMac is connected through a gigabit switch, the MacBook Air is connected through a Netgear 802.11g access point that is then plugged into the gigabit switch. There is also a FreeNAS box, both machines are able to read and write files to it at close to their pipe speeds. The main problem is when I am trying to upload files to the internet at large. The G5 is only hitting 0.1 - 0.25 Mbps. The Macbook is able to hit 2-3 Mbps. The setup (G5 / IPCop / Network) has been the same for 5 years. The issues with the internet speed started about 3 months ago. I hadn't tested on the Macbook at this point. I had complained to the ISP, they said their modem needed a firmware update, did that nothing changed. Reset IPCop, turned off squid, etc. No changes. The ISP switched the office over to a better plan with a theoretical 6 Mbps up, still no change. At this point I tried testing the Macbook, and lo and behold there's the speed. But why? I have tried changing out everything, cables, switches, using another ethernet port on the G5, wiping the system, using DHCP, using manual IPs, changing DNS servers, etc. Nothing works. I figured that if there was something horribly wrong with the network, then internally I would find a similar issue, but that is perfect. iperf, ping, etc show no dropped packets and near saturation of the internal network. I'm at a loss as to what the heck is going on. Any ideas would be appreciated! Below are some screenshots of speedtest.net: G5: Macbook Air:

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• How many megabytes per second may I expect from a gigabit USB 2.0 network card under linux?

  - by Nakedible

  I'm interested in the actual real-word throughput attainable with an external 1000BaseT USB 2.0 network card under Linux. I have been able to attain 90 megabytes per second on a PCI-E interface, but the USB 2.0 bus has a theoretical limit of 480Mbit/s, and in practice less than 40 megabytes per second. Is the actual throughput attainable with such a card under linux 40, 30, 20, or even as low as 10 megabytes per second, eg. no better than a normal 100BaseT network card?

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• Windows can't communicate with the device or resource (primary DNS server)

  - by David

  I am using Windows 7 Home Premium and am connecting to the Internet through Homeplug. When I connect and enable the LAN the status shows that I'm connected (the IPv4 shows connected), but after like 20 seconds it changes to No Internet connection. Even when it says I'm connected I can't connect to the Internet. My browser (Firefox) shows Server Not Found. When I run the troubleshooter it says "Windows can't communicate with the device or resource (primary DNS server)." What could be the problem, and how do I fix it?

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• Setting up virtual network in VMware workstation

  - by Saif Bechan

  I am playing around with VMware workstation and am trying to set up a small virtual network. I am having a little trouble with this I hope somebody can help me out. I want to have all the different virtual machines to have different internal IP adresses so I can ping them SSH etc, from within my windows machine. I am directly connected to the internet without a router, so using a bridged connection does not seem to work. The other options NAT and host-only do not seem to work also. I think i need to create a new adapter. I am testing this out with a virtual image of linux debain 5.0 lenny. I have WMware Workstation 7 with virtual network editor. Can anyone guide me in the right direction.

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• Inbound connections to a ubuntu machine running a VPN

  - by shanedowling

  Is it possible to open inbound connections to a machine connected to a VPN server? The machine is running ubuntu 9.10 with two network devices(a wireless card and ethernet port), I can connect to my machine locally using a local ip but when I try port forward using my router I can't connect from my external ip. Is there a way around this? I figure with 2 network devices I can vpn over one and use the other for inbound connections but I can't figure out how to do this. Thanks

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• Wireless internet became extremely slow on my 27" IMac

  - by Tam

  The wireless internet on my Mac became extremely slow recently on my 27" IMac. I don't recall doing anything different other than doing the Apple Software updates which I let it pop up and install automatically. On my Mac Book internet is still fine so I don't think it's the model or the router. I'm not sure where to start digging the cause of this or how to solve it. Looking into the System Preferences on my IMac, it's pretty identical to my MacBook!

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• How do I configure IIS to allow access to network resources for PHP scripts?

  - by Dereleased

  I am currently working on a PHP front-end that joins together a series of applications running on separate servers; many of these applications generate files that I need access to, but these files (for various reasons) reside on their parent servers. If I, from the command line, issue a bit of script such as: <?php var_dump(glob("\\\\machine-name\\some\\share\\*")); I will get the full contents of that directory, proving that there's no problem programmatically with PHP reading the contents of a UNC share. However, if I try to execute the same script from the web server, I get an empty array -- more specifically, if I use more explicitly functions designed to "open" a directory like it was a file, I get access errors. I believe this to be a permissions issue, but I am not a server/network administrator type, so I'm not sure what I need to do to correct this and get my script running, and the links I've checked out have not been a terrible amount of help, perhaps due to my background, or lack thereof as far as IIS is concerned, coupled with the fact that we are not actually using .NET for this. Relevant Stats: Windows Server 2008 Standard SP2 IIS 7.0 PHP 5.2.9 I will be connecting to two types of servers: a few other nearly-identical Server 2008 machines, and a machine running embedded XP. Links that have not been particularly helpful but maybe I am just misreading: http://support.microsoft.com/?id=306158 http://support.microsoft.com/kb/207671/EN-US/ http://support.microsoft.com/kb/280383/

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• Redirect traffic to local address so iOS speedtest app measures LAN speed

  - by ivan_sig

  I have mounted a Speedtest Mini server on a local LAMP, so I can test my LAN speeds effortlessly just by opening the URL with a Flash enabled web browser, the thing is, I want my iOS and Android devices to test with the LAN server too, not with the WAN, as I'm trying to measure LAN-Only performance. Is there a way so I can redirect the traffic intended to an specific external IP (The one of the real server) to my local server?. I know the servers IP as a short Wireshark analysis gave me the data, but still searching for a way to make that redirect. I have Jailbreak and root on my devices, so playing with system files is not a problem. I've tried mounting a proxy and making redirects by the hosts file and domain names, but it looks like Ookla's app relies on IP address only.

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• bridge traffic limiting via tc

  - by jackhab

  I have a Linux machine running as a bridge simulating various network conditions. I use tc for this. Introducing delays or packet loss is quite simple but I got into trouble trying to configure bandwidth limiting. Can you, please, show me how to limit all the traffic going through my bridge without any special rules and condition, simply limit it to 1Mb/s? Thanks. PS Your favorite link to tc tutorial will be appreciated.

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• 'hijacking' gui and mapping certain controls to certain functions. VNC. TouchOSC

  - by Nick

  I need a VNC LIKE application which rather than sharing the screen, can take control of a specific application and then share that functionality across a network to multiple clients. Obviously, VNC requires use of the mouse and therefore only one user can do something at one time, this is NOT what I am after. I am after something that can hijack the graphic user interface, map certain controls, and then display them in another piece of software (perhaps like TOUCHOSC) The software I would like to map and share is called YAMAHA STUDIO MANAGER and is used to control certain Yamaha audio hardware, and in my case a Yamaha LS9 and M7CL mixing console. Its free.

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• Windows clients cannot access machine running DHCP server

  - by science9712

  I'm trying to setup a small LAN, using an Ethernet switch, an Arch Linux server, and around 10 Windows XP machines. This network has no outside connections. The Arch machine has a self configured ip address (configured with ip addr add 192.168.0.1 dev eth0), and acts as a DHCP server(using dhcpd). This portion works great, windows clients get IP addresses, the correct gateway settings, perfect. However, the clients cannot connect to each other, or to the dhcp server. When I run ping 192.168.0.1 on any client, I get no response, same happens if I try to ping any other client. On the gateway machine, I can't ping any of the clients either. Any help would be much appreciated!

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• Bypass network stack. Which options do we have? Pros and cons of each option [on hold]

  - by javapowered

  I'm writing trading application. I want to bypass network stack in Linux but I don't know how this can be done. I'm looking for complete list of options with pros and cons of each of them. The only option I know - is to buy solarflare network card which supports OpenOnLoad. What other options should I consider and what is pros and cons of each of them? Well the question is pretty simple - what is the best way to bypass network stack? upd: OpenOnload It achieves performance improvements in part by performing network processing at user-level, bypassing the OS kernel entirely on the data path. Intel DDIO to allow Intel® Ethernet Controllers and adapters to talk directly with the processor cache of the Intel® Xeon® processor E5. What's key difference between these techologies? Do they do roughly the same things? I much better like Intel DDIO because it's much easy to use, but OpenOnload required a lot of installation and tuning. If good OpenOnload application is much faster than good Intel DDIO application?

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• Is this anycast behaviour correct?

  - by etheros

  When connecting to an service provided using anycast, I am experiencing different behaviour depending on whether the request is made using TCP or UDP. With TCP, the request is made to address A, and the subsequent response also comes from A. With UDP however, while the request is made to A, the response comes from address B. Is this correct behaviour, or should the UDP response come from the same address it's sent to?

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• Vlan Tagging at Access Port in Switch

  - by singh

  I'm Confused from the fact that Vlan tagging is done at access port and trunk port always gets tagged packets (until its case of native vlan).But I still believe in other fact which says tagging happen only when a frame hit the trunk port which means trunk port gets untagged frame and tagging is not possible at access port. Would like to know where actually this tagging happens ? and also which command we can use to encapsulate 802.1q protocol to access port ? The way we do at trunk port is switchport trunk encapsulation dot1q Is the above command applicable for access mode also?

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• Window 7 image in vmware will allow network connection out but not http

  - by Ormis

  I am currently trying to create a set of images to deploy on my network, but I've run in to a snag. When I create my own Windows 7 image I can successfully use NAT for connecting to the network but whenever I try to access a webpage I get nothing. To be more specific, All firewalls/iptables are disabled on my host machine, my virtual machine, and my network. I can do lookups and all addresses respond correctly (i'm even using Google's DNS). On the host OS i have full connectivity. On the virtual machine I can ping any device I want and all addresses resolve correctly. Within a browser I cannot reach any page via hostname or IP. I feel almost like port 80 is being blocked but i can't find any reason this would be the case. If anyone has had this occur before, I would love some insight to the problem. I initially asked this on stackoverflow and now my eyes are now opened up to superuser. Thank you for any help you can provide.

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• Network bandwidth usage dashboard?

  - by SkippyFlipjack

  I have a couple of wifi access points hooked up to my home network, one of which I keep unsecured for some development I do; there are only a couple other homes within range and they've got their own wifi so it's not a big concern. I also have a Sonos system, Tivo, Roku, a couple laptops, a couple phones, an iPad and a desktop machine, all of which are internet-smart. So when my internet bandwidth tanks and it takes five minutes to load a YouTube video, I want to know what's going on, and there are many potential culprits. I'd like to be able to plug my MacBook into the primary router and see a nice little dashboard of the units on the network and what kind of bandwidth each is using at that moment. I could figure this out from WireShark or tcpdump but figure there has to be an easier way. I've tried a few different commercial products but none really presented the right info. Suggestions? (This may be a question for superuser since my Apple Time Capsule's SNMP capabilities are limited, but I figure admins of small business networks would have dealt w/ the same issue..)

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• Multiple network cards, controlling where my traffic goes

  - by thefinn93

  This is an Ubuntu 12.04 server install. I have multiple network cards, eth0 and eth1 lets call them. eth0 is connected to the internet, and all of my traffic goes through it, until eth1 gets plugged in. Then the machine tries to send everything through eth1, which for various and sundry reasons does not go out to the Interent. The only traffic it doesn't send through eth1 is traffic on eth0's subnet. It also will not accept inbound connections on eth0 from outside of eth0's subnet. I'd like all outbound traffic to go out eth0, but I'd like incoming connections from to either card from any subnet to work.

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• Streaming a large file

  - by Rich

  quick question say i wanted to download a file of considerable size 10gb say and i sent the GET request to a web server to download that file question is, if the client stopped reading the TCP connection, would the entire file still be downloaded, or does it depend on the client sending back an ack or something to the circuit asking for the next packet hope that makes sense This question was originally asked involving the Tor network, but i just want to know how a standard internet connection would handle this Thanks

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• Windows-7 Ultimate 64 bit wont connect to my wired/wireless networks.

  - by A302

  Windows 7 Ultimate 64 bit. Everything was working fine & then just stopped working. The nic card Realtek PCIe GBE Family Controller is enabled but does not connect to my router (cables & router ports are good). Wireless Atheros AR5007EG is enabled but the connection is limited (encryption type / key have been verified). A laptop running XP can connect both wired / wireless. SSID is not being broadcast, connect to network if it is not broadcasting is checked. Have checked services.msc for Bonjour & did not see it listed. Network & sharing center does not list any active networks. Device manager lists both devices as functioning properly. Router configuration has not been changed. Virus scan has not found anything. I would like to fix this rather than using Acronis to do a system restore. Thanks in advance for any advice offered in solving this. 26 Jan, the nic card & wireless are working using PCLinux OS Live CD. It appears that the problem is Windows 7 related.

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• How do you use Time Capsule for MAC controlled Internet?

  - by Kevin Perttula

  I'm using an Internet Provider that requires a username and password to log in; the prompt shows up as soon as you open a web browser. Because of this, I can only have one device online at a time. How can I get my Time Capsule to essentially log in as the user and allow other devices to connect through it. My Time Capsule has worked with other ISPs that don't require the user log in, but I recently moved. I may be wrong about how the ISP is allowing access, I wasn't sure how to describe the problem. Thanks.

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• Cant ping ip on LAN. Port forward works fine though.

  - by Anoop

  I have a Solaris 11 machine running inside the LAN. It is a default install. I can access the machine and ping it if I ssh into my router (if it matters, it is running dd-wrt). I cannot ping the Solaris machine using ip address from any other machine inside the LAN. But if I setup port forwarding everything works perfectly fine. I can also use the port forward from outside the LAN (from my office) - which is good and how I want it to be. I can SSH and ping and do pretty much everything else from outside as well as inside but only as long as I have the port forwarded from my router. Why would I not be able to ping or ssh or even access the Solaris 11 machine from within the LAN - I have checked and couldn't find any firewall running on the Solaris 11 box. I even tried disabling every known firewall on the router (dd-wrt, it had something like SPI firewall running). I even tried setting a static IP for my Solaris box but all in vain! Please help me understand how and why this happens!! Thanks.

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• Any consumer routers with Outgoing VPN support?

  - by Brian Lacy

  When I'm working at home, I need to be able to connect to three different outgoing VPNs, two of which happen to use the same internal IP addressing schemes (192.168.0.*). I also need a static address for my VirtualBox VM so I can connect to my testing web server. Are there any routers which will allow me to connect to multiple outgoing VPNs and assign different internal IP addresses through NAT? Is such a thing even possible, or are there alternate solutions available? Thanks!

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• My Laptop (HP/Compaq 2510p) running ubuntu 10.04 LTS keeps losing the WLAN connection.

  - by Ernelli

  I am using Wicd and can successfully connect to my ADSL router (Thomson TG 787) using WPA PSK. But with regular interval I lose the ability to connect to Internet. I can ping the GW and can actually ping servers on the Internet but not connect to them using HTTP (Tested with both Firefox and wget). I would suspect the router unless for the fact that the problem does not show up when running Windows XP on the same computer and also, when the problem arises, a simple disconnect/connect in Wicd solves the problem, which does not involve the router (Except for the DHCP request). I have searched Ubuntu forums without luck, most problems described relate to specific network drivers or other problems. Does anyone have the same experience with Linux/Ubuntu and WLAN?

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