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• Could some one please explain the various proxy configuration scenarios?

  - by RP.

  I am working on a client application in C# which does a various kinds of communication with a server( eg: uploads, downloads etc ). We have a legacy system which does the same functionality and we get in to proxy configuration related issues frequently.It uses the settings from internet explorer network settings. Most of the time these are due to specific proxy configuration( Eg: Proxy auto-config etc ). I am trying to understand the various scenarios used in corporate environments for proxy configurations. Could some one please explain the various proxy configuration scenarios?

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• Solaris 10 invalid ARP requests from 0.0.0.0? Link up/down every hour or 2

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). [mymacaddress]/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) It's being logged every hour. I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. There are some tunable SCTP parameters but it's not something I'm familiar with. Do I have to add changes to /etc/system? Looks like sctp_heartbeat_interval might be what I need to change? If it makes any difference, I have a few solaris zones running on this server, each with their own IP address on a virtual interface. eth0:0, eth0:1, etc. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else? Update: This was happening more frequently but now it seems to be happening roughly every hour or every two hours. It's not consistent. I tried setting setting the link speed and duplex to match the switch port and that seemed to make it stop happening for a few hours but then it started again.

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• something is downloading in background Linux

  - by wisdom

  My laptop boots normally to Linux -LinuxMint- and immediately I like to open gnome-system-monitor but the shock is that something is downloading(the problem has been out 2 days ago) and nothing I run yet ! I did iftop in terminal but nothing strange -a screen shot provided-, also I tried nethogs which showed nothing at all. The more complicated when I reboot and same problem is there so I can't browse/surf Internet, no one connected to my network can browse any more it's absorbing the stream horribly! After many reboots it will go to normal state(no background downloading). But really I can't figure out the problem going behind the scene ! Any suggestion,any help would be appreciated...thanks

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• HP Officejet 6000 E609n unexpectedly goes offline

  - by Sajee

  My local library has a number of Windows Vista SP1 PCs connected to two HP Officejet 6000 E609n wireless printers. Each PC can print to either of the two printers and one of the two printers is the default on each PC. This configuration has worked well over the last year w/o any trouble. Recently, the library staff is reporting that sometimes when patrons try to print, they can't. Closer inspection shows that the the default wireless printer is offline. In order to get the printer online again, the printer has to be restarted. In Control Panel Printers applet, under the Printer menu, the "Use Printer Offline" option is grayed out and there's no way to bring the printer back online w/o restarting it. Does anyone know what's going on here?

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• What kernel modules are required for wi-fi to work?

  - by Leonid Shevtsov

  My custom-built 2.6.32 kernel cannot connect to any WPA-protected network. The kernel includes (probably?) everything that should be needed for wifi, including IPv4 network support (IPv6 is disabled), the ath5k wireless driver (which is used in the generic Ubuntu 2.6.31 kernel) and all crypto APIs. The card is being detected, however, iwlist scan returns wlan0 Failed to read scan data : Network is down and network-manager log says <info> (wlan0): driver supports SSID scans (scan_capa 0x01). <info> (wlan0): new 802.11 WiFi device (driver: 'ath5k') <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/1 <info> (wlan0): now managed <info> (wlan0): device state change: 1 -> 2 (reason 2) <info> (wlan0): bringing up device. <info> (wlan0): preparing device. <info> (wlan0): deactivating device (reason: 2). supplicant_interface_acquire: assertion `mgr_state == NM_SUPPLICANT_MANAGER_STATE_IDLE' failed <info> modem-manager is now available <WARN> default_adapter_cb(): bluez error getting default adapter: The name org.bluez was not provided by any .service files <info> Trying to start the supplicant... <info> (wlan0): supplicant manager state: down -> idle <info> (wlan0): device state change: 2 -> 3 (reason 0) <WARN> nm_supplicant_interface_add_cb(): Unexpected supplicant error getting interface: wpa_supplicant couldn't grab this interface. The exact same configuration works with the generic kernel. Is anything except wifi and crypto api needed for wi-fi to work?

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• "Play on another device" function not working with Samsung Allshare

  - by Tural Teyyuboglu

  Briefly I can't get work "Play on another device" function More detailed My Samsung TV (which support network) and PC are in the same network. The problem is, I can play PC contents from TV. But when I try to control TV remotely from Allshare software (PC), it shows TV only as connected device: But not as remote player in "players" list The result Tried to turn off firewall completely, reset router, re-install software. No success. Please help. BTW. On this link they kinda explained how to do it, but I software doesn' detect the TV as player in my case: http://www.samsung.com/global/allshare/pcsw/quickguide.html

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• hosts file for ip address

  - by Jon Clegg

  I would like to map ip address to specific localhost interfaces (e.g. 23.45.66.77 = 127.0.3.3). For named hosts I can use the hosts file. Naturally this doesn't work for IP address. This has to work in windows, the only option I've found so far is implementing a TAP/TUN driver like openvpn does. Are there any other options?

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• Torrent upload ratio not updated on Synology DS212+

  - by user179271

  I have a Synology DS212+ NAS running DSM 4.2-3211 (current version). I use it for several purposes including torrent download using Download Station and a tracker that needs authentication. My problem is that my download/upload ratio isn't updated, so it constantly falls down. My NAS is behind a router, and I configured the NAT to forward ports 6890 to 6999 to the internal IP address of the NAS. Here are the Download Station settings : TCP port : 6990, Sharing ratio : 900%, Sharing time : infinite, max download speed : 0 (no limit), max upload speed : 0 (no limit), BT protocol encryption : checked, max numbers of peers allowed by torrent file : 4000, DHT : checked, with port 6889. When the DHT option is not checked, the NAS doesn't upload any files. I don't know what is this option for. Can someone help me to solve this problem ? Did I miss any step, or does it come from the NAT ? How is the authentication managed by Dowload Station ? (Sorry for my english) Thanks.

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• What program sent which packet to the network [closed]

  - by Erik Johansson

  I would like to have a tcpdump like program that shows which program sent a specific packet, instead of just getting the port number. This is a generic problem I've had on and off sometimes when you have and old tcpdump file lying around you have no way to find what program was sending that data.. The solution in how i can identify which process is making UDP traffic on linux ? is an indication that I can solve this with auditd, dTrace, OProfile or SystemTap, but doesn't show how to do it. I.e. it doesn't show the source port of the program calling bind().. The problem I had was strange UDP packets, and since those ports are so short lived it took me a while to solve this issue. I solved this by running an ugly hack similar to: while true; date +%s.%N;netstat -panut;done So either a method better than this hack, a replacement for tcpdump, or some way to get this info from the kernel so I can patch tcpdump. EDIT: This was asked on superuser "tracking what programs sends to net", no good solution though.

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• What is the most common default computer name (sys properties)

  - by John

  What is the most common default computer name for Windows (Home, Pro, Vista, and 7)? (Or a list of the most common.) I tried Google, and read that Redhat linux defaults to "localhost," and Toshiba laptops (Windows) default to Toshiba, and some Dells default to DELL+some model number.

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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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• NFS mount mounted inside another NFS mount disappears randomly

  - by espenfjo

  I have quite an odd issue where my nested NFS mounts just disappear randomly from time to time. The fstab entries look somewhat like this: nfs:/home /home/nfs rw,hard,intr,rsize=32768,noatime,nocto,proto=tcp 0 0 nfs:/bigdir /home/bigdir nfs rw,hard,intr,rsize=32768,noatime,nocto,proto=tcp,bg 0 0 The issue is that from time to time the "/home/bigdir" folder will be empty, even though mtab think that the share is still mounted. nfsstat et. al. do also think the share is still mounted. Only thing that works is by unmounting, and then (re)mounting the bigdir share. The server side is a NetApp. The client side is RHEL5.5, 2.6.18-194 kernel (Yes, I know 5.8 is out, but as far as I can see there are no erratas for this particular issue). I can use various hacks like automount, or mounting it to another path and then using --mount bind, but I would like to fix the underlying issue. -- Best regards Espen Fjellvær Olsen

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• How does IPv4 Subnetting Work?

  - by Kyle Brandt

  This is a Canonical Question about IPv4 Subnets How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation).

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• How to increase signal/range of your Wi-Fi antenna-less repeater/booster over the network?

  - by kenorb

  I've BT Home Hub in the upper flat (2-3 walls behind) and I'm using WPS Wireless-N Wifi Range Router Repeater Extender in my flat where I'm using my laptop. These are antenna-less devices. Are there any life-hack tricks to increase signal/range of my repeater without buying the new more powerful repeater? I've tried already to move my repeater closer to the ceiling or putting the aluminium foil underneath, but it didn't help. Are there any methods, specific plates or materials which can boost the signal? Specification: Model: WN518W2 Frequency range: 2.4-2.4835GHz Wireless transmit power: 14 ~17 dBm (Typical) Wireless Signal Rates With Automatic Fallback: 11n: Up to 300Mbps(dynamic), 11g: Up to 54Mbps(dynamic), 11b: Up to 11Mbps(dynamic) Modulation Technology: DBPSK, DQPSK, CCK, OFDM, 16-QAM, 64-QAM Receiver Sensitivity: 300M: -68dBm@10% PER / 150M: -68dBm@10% PER / 108M: -68dBm@10% PER / 54M: -68dBm@10% PER / 11M: -85dBm@8% PER / 6M: -88dBm@10% PER / 1M: -90dBm@8% PER Product dimensions: 11 * 6 * 7cm

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• Dual monitor over network with Windows Host and Mac client?

  - by thegreyspot

  I'm looking for something like MaxiVista that lets you extend your monitor to a second computer monitor. However Maxivista is only Windows base. My main computer is Windows 7 and the other computer I'm trying to connect to is a Mac. Note I am not trying to share my keyboard or mouse, I want to use the Mac as a third display.

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• Linksys router with multiple external IP's

  - by Adrian Mester

  In an office I've got a network connection with 5 external IPs and a Linksys router (I'm not 100% percent sure of the model). I need 4 of those 5 IPs to be routed to a server, and the fifth to be shared between the other computers at the office. This can probably be done using a switch in front of the router. Connect the server and the router to the switch, and let the router handle the rest of the network. Is there a way to configure the router to route the 4 IPs to the server, and create an internal network the the other computers at the same time?

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• How to test/debug bad network wiring?

  - by Jack Lloyd

  I recently bought a place already wired with Cat 5E (8 ports, leading to a central closet). However attempting to get link, nothing works. On closer examination, it was obvious that the ends in the closet were wired backwards (brown on pin 1, etc). The jacks that I've pulled out of the wall do look to be correctly done. However, testing with a network cable tester shows zero link between any of the jacks and any of the ports in the closet - I had expected to just see a 1/8, 2/7, ... 8/1 mismatch, but instead get nothing at all. The runs are accessible and look neat, though they take some bends that seem quite sharp and are in some cases much longer than they need to be (the person who put this in was a professional electrician but I suspect this was the first time he ran network cabling). My best guess at this point is that he either bought bad cable, or put so much tension on it that he snapped wires. Though it seems surprising/unlikely that I wouldn't get at least one active wire on one of the 8 lines. So, my question: is there anything else I should try or test before I go ripping out everything and running new cable?

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• Why does 1GBit card have output limited to 80 MiB ?

  - by Gallus

  I'm trying to utilize maximal bandwidth provided by my 1GiB network card, but it's always limited to 80MiB (real megabytes). What can be the reason? Card description (lshw output): description: Ethernet interface product: DGE-530T Gigabit Ethernet Adapter (rev 11) vendor: D-Link System Inc physical id: 0 bus info: pci@0000:03:00.0 logical name: eth1 version: 11 serial: 00:22:b0:68:70:41 size: 1GB/s capacity: 1GB/s width: 32 bits clock: 66MHz capabilities: pm vpd bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation The card is placed in following PCI slot: *-pci:2 description: PCI bridge product: 82801 PCI Bridge vendor: Intel Corporation physical id: 1e bus info: pci@0000:00:1e.0 version: 92 width: 32 bits clock: 33MHz capabilities: pci subtractive_decode bus_master cap_list The PCI isn't any PCI Express right? It's a legacy PCI slot? So maybe this is the reason? OS is a linux.

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• Percentage of computers on Internet behind a NAT?

  - by Mr.M

  I'm in a process of developing a server application and I would like to know if there are some numbers (or experience from people) on how many computers are behind the NAT on the Internet? Since my application is supposed to be a small server, being forced to implement UPNP support and TCP hole-punching with an external server may sway my determination, especially if more than 80% of the Internet is behind NAT.

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• How to route traffic through a specific SOCKS proxy on a per-app basis?

  - by GJ.

  I'm running a certain desktop app (actually via AIR if it makes any difference) which doesn't have any built-in proxy configuration settings. I need to get all traffic just from this app directed through a secure SOCKS proxy. This implies I can't use the global network preferences, as these would affect many other apps. Is there any way to force all network communication through a given SOCKS proxy on a per-app basis? It would also be helpful to know if there's a way to perform such routing globally, based on specific IP addresses (as this could allow for some reasonable workaround).

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• Get the wireless adapter frequency-band mode in Windows 7

  - by Petr

  I have a dual-band 802.11n router operating in both frequency bands with the same SSID. My Windows 7 laptop has a dual-band wireless adapter. Is there a way to find out which frequency band is the one currently used by the client? Also, is there a way to set the preffered band? Thanks. EDIT1: The router is Linksys E4200 (V2) and I essentially want to keep the 2.4GHz band in the mixed-mode so that the legacy 802.11g devices can connect while allocating the 5.0GHz band for 802.11n devices. The laptop's adapter (Intel Centrino Ultimate-N 6300 ANG) can operate in both 802.11n modes. EDIT2: Related topic

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• Once VPN connection is done, how do I proceed reaching the other side address space?

  - by sports

  I'm using Windows Azure and I created a VPN Site To Site, configured like this: My virtual network: My address space: 10.2.0.0/16 (65531) Subnet1: 10.2.1.0/24 (251) Subnet2: 10.2.2.0/24 (251) Gateway: 10.2.3.0/29 (3) My public gateway IP: 137.135.x.z (I wont show x and z for security reasons) This public gateway uses, as you can see, 5 IPs on subnet1 and 5 IPs on subnet2, and 5 IPs on the gateway "Their" virtual network (in azure this would be a "Local network") Their address space: 172.60.100.67/32, 172.60.100.68/32, 172.60.100.69/32 Their device public IP: x.x.x.x (ommited for security reasons) Notice their address space are 3 IPs So: the VPN is "in green" (in Azure is showing up green, literally, like these two are connected) and now my question is: How do I proceed to reach their address space? I've tried creating a virtual machine (Windows Server 2008, but it could be an Ubuntu) on "my" virtual network and it is automatically "placed" on subnet1 or subnet2. So it gets the IP 10.2.1.0 (valid example), I can't choose to place the virtual machine in the gateway address space. How do I "reach" any of the IPs 172.60.100.67, 172.60.100.68, 172.60.100.69 ? In other words: How can I telnet any of these IPs? or ping? or see them in my network? Please provide me answers for Windows Server 2008 or for an Ubuntu. I'm open to create any virtual machine.

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• Windows 7 Wireless Network Adapter Stopped Working

  - by Andrew B Schultz

  I have a Windows 7 Ultimate machine where the wireless adapter all of a sudden started having trouble connecting to wireless networks. Whenever I go to a new place and try to connect to a wireless network, it says that the DNS server is not responding, and tells me to go unplug the router and try again. After several locations in a row telling me this, I began to realize something was wrong with my adapter, not the routers. I am no longer asked to identify the security level for any new networks (Work, Home, or Public) like I used to be (it defaults to Public now - with the park bench icon). Often, resetting the router doesn't even work. Running the Windows 7 troubleshooter doesn't give me anything better than the advice to reset the router. However, the adapter will still connect to the wireless network at my main office without any problems. Does anyone know why a wireless network adapter can get so finicky so suddenly? Thanks!

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• Why the VPN Network Shake-Up?

  - by Brent Arias

  I can RDP to another machine on my home network, only if I'm not also hooked up to my employer's VPN with the Cisco VPN client. Indeed, I can't even ping the other machine by name in this mode, because ICMP suddenly thinks that ( ping myMachine ) now means ( ping myMachine.myEmployer.com ). Of course there is no machine by that latter name, and so it fails. Even weirder, once I disconnect from the VPN I can again ping myMachine successfully, but ICMP reports the machine by its MAC address instead of its IP address. I don't think I've ever seen ping identify another machine by its MAC address. So two questions: How can I access via RDP/ping the other machine BY NAME on my local network while also connected to the VPN? Why is ping identifying a MAC address for the machine on my home network, instead of an IP address? And how can I change this so that an IP address is reported instead? For question #1, I can indeed access the other machine on my home network by IP address. I suspect if I put the name-IP pair into my HOSTS file, then I would be able to access it even when connected to the VPN. But I wonder if there is another (more elegant) solution?

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• Sharing internet connection from Windows XP using wi-fi router

  - by Darius

  Hi, I have an network configuration like: Ethernet cable from ISP connected to Windows XP machine, configured with static IP 192.168.0.3 Another ethernet connection from 2nd Windows XP machine's network adapter to a Wi-Fi router (D-Link Airport G+) XP set to "Share internet connection", the 2nd adapter configured as static to 192.169.0.1 D-Link Airport Wi-Fi router also configured as "static connection", it's IP set to 192.169.0.2, default gateway set to 192.169.0.1. Network mask everywhere is 24. Laptop computer connected with the router with static IP 192.169.0.3 The problems are: XP machine sees the router (it's able to ping it and access it via the web admin tool) The router somehow cannot PING the XP machine (using the tool provided by the web-based admin tool) The laptop computer cannot ping anything and cannot be pinged The router is only accessible when the ethernet cable is connected with a router's 1-4 LAN port, when I connect it via "WAN" port (which I believe is the proper one) it's not visible from the XP machine If you have similar experience with configuring a network like this I would really appreciate your help. I cannot use the Wi-Fi router with the ISP cable itself.

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