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• Can't connect remotely to Windows Server 2008 R2

  - by JohnyD

  I have a new Dell R710 server running Windows Server 2008 R2. I one of it's 4 nic's set up and the rest are not being used. I have successfully given it an ip address, network mask, and dns servers. I can ping and resolve this machine from anywhere else in the network. However, when I try to connect to it via RDP it does several things: 1) it might just outright refuse me with the message, "This computer can't connect to the remote computer. Try connecting again." 2) it might connect me and let me chose the account I would like to log on as... but when you select an account then you receive the same message as in #1 3) it might actually allow you to connect but only for about 1 minute and then you receive the same message and it closes your session. I have configured the firewall service to allow for RDP over the domain network connection. This didn't have any noticible effect. I have now disabled the firewall for all 3 networks and have even stopped the Windows Firewall service. I am still having the same issue. I am new to Server 2008 R2 and things are very different. Please give me any advice you can on how to resolve this issue and/or any other gotchas that are sure to come my way. The 2003 - 2008 learning curve seems steep. Thanks

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• Can't connect to domain computers until reboot

  - by thealliedhacker

  I have a domain with about 300 Windows 7 and XP machines, with the domain controllers running Server 2003. Sometimes, I lose the ability to communicate/authenticate with some of the machines until I reboot my computer. This also happens from other computers and regardless of user account and operating system. In other words, say I'm on ComputerA, and I can't connect to ComputerX. I can go to ComputerB and connect to ComputerX, but ComputerB may not be able to connect to ComputerY. If you reboot ComputerA, then it will be able to connect to ComputerX again. Here are some messages from various utilities: sc: [SC] OpenSCManager FAILED 1722: The RPC server is unavailable. mmc (compmgmt.msc): Computer (computer name) cannot be managed. The network path was not found. explorer (\\computer): Windows cannot access \\(computer name). ping: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss) / Average = 1ms

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• Internet access using Edimax BR-6204WG as NIC

  - by Mat Richardson

  My internet access at home is provided by Virgin Media via their superhub. I have a laptop with no NIC - however I do have a spare wireless router, the Edimax BR-6204WG, which I have been led to believe can be used to bridge wireless connections. Only problem is, I'm not sure how to go about doing this. The manual for the device is here:- http://www.edimax.co.uk/images/Image/manual/Wireless/BR-6204Wg/BR-6204Wg_Manual.pdf Basically, I want to be able to connect the Edimax wireless router to my laptop using ethernet cable and to use it to pick up the wireless connection from my Virgin superhub. I've managed to get so far in some ways, but then I'm stuck.

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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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• Cannot connect to WEBrick on home network

  - by Chris Stewart

  I'm an Android developer and often my applications require server-side code. I typically use Ruby on Rails for the web app, and during development will run the server on my local machine (Mac OS X) with WEBrick. In the morning when I get to the office, I'll run ifconfig in the console to see what IP my laptop has been given that day. I'll use that IP in my Android app when making requests to the web app in question. This all works fine, when I'm in my office. When I get home, I attempt to do the same thing, find my laptop's IP via ifconfig, set it in my app's config file, but the destination can never be found. To exclude my app from the set of hurdles, I attempt to visit the web server IP (e.g., http://192.168.1.4:3000) from my phone's browser, and it cannot connect. If I try from my laptop, which is running the web server, it works fine. If I try from another machine, on the same network, it also is unable to connect. Given this, I think I've narrowed it down to some kind of configuration in my home network, but I frankly have no idea what the cause could be. I don't have anything special at home, your basic Verizon FiOS router/modem with everything connected via Wi-Fi (Wi-Fi for both phone and laptop at work as well, fyi). I've tried disabling the firewall on my Verizon router, enabling port forwarding, and just about everything else I could do for port 3000, and nothing has changed. Dear Server Fault geniuses, please help a poor developer out. :) Edit: Some follow up items to add. My Mac's firewall is not active, and all incoming requests are allowed. I've also verified on my phone and laptop, that they're on the same network (192.168.1.4 Mac, 192.168.1.9 Phone). I have no idea why this isn't working. Edit 2: I went into System Preferences, enabled Web Sharing, and tried to view the website from my phone and it didn't connect. So it's not WEBrick or related to Rails. The firewall on my machine is off and the firewall on my router is off. Edit 3: Some progress. I set up port forwarding for port 3000 to my laptop, found the external IP, and used that and it connected fine. So, there's definitely something not quite set up correctly on my internal network.

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• Add 802.11n to existing 802.11g environment

  - by Andrew Robinson

  I have a small home network that is currently running 802.11g. Two computers that are capable of 802.11n and two devices (a BlackBerry and a Skype phone) that are limited to 802.11g. I have a few neighbors running 802.11g but their signals are very weak. How big an impact will the two G devices have on N speeds? Will they pull the whole network back down to G? These two devices are hardly ever used where as the other N devices are heavily used. If I add an N router to the network (instead of replacing the G) and set my existing G router to use channel 1 with 20MHz bandwidth and then set the N router to use 6 & 11 for 40MHz will I eliminate the overlap and allow for full speed on both networks?

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• Why is it a bad idea to use multiple NAT layers or is it?

  - by iamrohitbanga

  The computer network of an organization has a NAT with 192.168/16 IP address range. There is a department with a server that has an IP address 192.168.x.y and this server handles hosts of this department with another NAT with the IP address range 172.16/16. Thus there are 2 layers of NAT. Why don't they have subnetting instead. This would allow easy routing. I feel multiple layers of NAT can cause performance losses. Could you please help me compare the two design strategies.

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• Is it safe to leave a broadband router running 24/7?

  - by Anirvan

  My father-in-law's ISP warned him in the strictest possible terms to physically turn off his rented Nokia Siemens C2110 PPPoE broadband router when not in use. Everyone I know leaves their broadband router on all the time, and I've never heard of any negative impacts. Is leaving a consumer broadband router running 24/7 really problematic? Is the ISP in question being ridiculously paranoid?

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) exist out there that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly.

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• routing through multiple subinterfaces in debian

  - by Kstro21

  my question is as simple as the title, i have a debian 6 , 2 NICs, 3 different subnets in a single interface, just like this: auto eth0 iface eth0 inet static address 192.168.106.254 netmask 255.255.255.0 auto eth0:0 iface eth0:0 inet static address 172.19.221.81 netmask 255.255.255.248 auto eth0:1 iface eth0:1 inet static address 192.168.254.1 netmask 255.255.255.248 auto eth1 iface eth1 inet static address 172.19.216.3 netmask 255.255.255.0 gateway 172.19.216.13 eth0 is conected to a swith with 3 differents vlans, eth1 is conected to a router. No iptables DROP, so, all traffic is allowed. Now, passing the traffic through eth0 is OK, passing the traffic through eth0:0 is OK, but, passing the traffic through eth0:1 is not working, i can ping the ip address of that sub interface from a pc where this ip is the default gateway, but can't get to servers in the subnet of the eth1 interface, the traffic is not passing, even when i set the iptables to log all the traffic in the FORWARD chain and i can see the traffic there, but, the traffic is not really passing. And the funny is i can do any the other way around, i mean, passing from eth1 to eth0:1, RDP, telnet, ping, etc, doing some work with the iptable, i manage to pass some traffic from eth0:1 to eth1, the iptables look like this: iptables -t nat PREROUTING -d 192.168.254.1/32 -p tcp -m multiport --dports 25,110,5269 -j DNAT --to-destination 172.19.216.1 iptables -t nat PREROUTING -d 192.168.254.1/32 -p udp -m udp --dport 53 -j DNAT --to-destination 172.19.216.9 iptables -t nat PREROUTING -d 192.168.254.1/32 -p tcp -m tcp --dport 21 -j DNAT --to-destination 172.19.216.11 iptables -t nat POSTROUTING -s 172.19.216.0/24 -d 172.19.221.80/29 -j SNAT --to-source 172.19.221.81 iptables -t nat POSTROUTING -s 172.19.216.0/24 -d 192.168.254.0/29 -j SNAT --to-source 192.168.254.1 iptables -t nat POSTROUTING -s 172.19.216.0/24 -o eth0 -j SNAT --to-source 192.168.106.254 dong this is working, but,it is really a headache have to map each port with the server, imagine if i move the service from server, so, now i have doubts: can debian route through multiple subinterfaces?? exist a limit for this?? if not, what i'm doing wrong when i have the same setup with other subnets and it is working ok?? without the iptables rules in the nat, it doesn't work thanks and i hope good comments/answers

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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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• Route an IP from WAN to a host on LAN on OpenWRT

  - by Zsub

  EDIT: I know how to use NAT, I specifically want the server to be reachable on two IP's, one private, one public, with the firewall of the OpenWRT in between, if feasible. At the office we have recieved a /29 from our ISP. The first address is reserved for their endpoint, so I'm free to use five addresses. We run a local network, so of course there is a router in between running OpenWRT to provide all hosts with (W)LAN (dhcp from a private range). However, we also have a server running OS X Server 10.6 (Snow Leopard) and I'd like that server to be accessible both from the LAN using a private IP as well as from the WAN on it's own public IP. Point of note is that the server only has one network port, so multiple NICs is not an option, unfortunately. How would I go about doing this?

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• How to add a broadcast address to loopback with ifconfig on a OS/X?

  - by chrisapotek

  I am trying to use ifconfig to turn on broadcast on my loopback interface. It currently reads: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384 As you can see, no broadcast address! :( :( :( I tried this on OS/X but it did not work and it did not give any error or feedback: ifconfig lo0 broadcast 127.255.255.255 Any guru would know that? I have one server that sends one packet. I have two clients running on the same machine as the server. I need them to pick up the packet WITHOUT having to force the server to send it twice.

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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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• Time-Machine backup over SSH tunnel to NFS mount

  - by BTZ

  I've recently started using a new NAS which runs CentOS 6.2. One of the purposes of the NAS would be to serve as a backup target. Whilst I have been using Apple's Time-Machine for a while and I am very satisfied with it, I'd like to continue using it. Backing up directly to an address in my network is no hassle; all works fine. For security reasons I'd like all my traffic to go through an ssh tunnel to the NAS. This way I can avoid needing to get a VPNserver (for personal reasons). As of NFSv4 the NFS deamon is bound to port 2049, which makes it easy for me to direct all traffic through a ssh tunnel. Tunnel: ssh -f admin@ms -L 2000:localhost:2049 -N Mount: mount -t nfs -o nfsvers=4,rw,proto=tcp,sync,intr,hard,timeo=600,retrans=10,wsize=32768,rsize=32768,port=2000 localhost:/mac_backup /Volumes/backup This works fine for Finder/terminal and throughput is almost equal to direct traffic. (CPU of the NAS does ride high when I reach max bandwidth though) Now the problem: With Time-Machine I can't use the NFS mount point mounted on localhost. TM seems to try to connect to it and then give me a "OSStatus error 65". I also tried using NFSv3 (I correctly forwarded all ports) with no luck. Can anyone shed a light on this and/or give a solution?

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• How to prevent wifi router from broadcasting multiple ssids?

  - by user1092288

  I have the following Wi-Fi router: http://www.beetel.in/business-solutions/international-business/adsl/450-four-port-wifi-modem And I am also posting screen shots of ISP settings (from 192.168.1.1). Problem is, my Wi-Fi router is broadcasting multiple SSIDs (even the SSIDs which I used in the past and aren't entered in settings at present). How do I resolve this to broadcast single SSID? I have already tried factory settings restore. SSID1 Settings SSID2 Settings SSID2 Settings- greyed-out, unable to change anything

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• design a large scale network for an organization

  - by Essam

  i want to design a large scale network for an organization with HQ and two branches. i want to use a class A subnet. if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that (number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (let's say it is a university with two branches in two different states)?!

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• Turning on Bluetooth disables wifi on Yoga 2

  - by Yostage

  I have a Lenovo Yoga 2. The moment that I turn on bluetooth, the wifi drops out - I lose connection, and connecting again shows "connection failed". If I turn the bluetooth off, wifi can reestablish fine. I've tried lots of different combinations of drivers for both the wifi and the bluetooth, but no combination has has changed this behavior yet. I've read some speculation that the cards have insufficient shielding, but that seems like kind of a large flaw to ship with. I've tried with a Carbon X1, a Yoga 2 Pro, and a Yoga 2 all next to each other on the desk while running InSSIDer. The X1 and the Y2P don't lose wifi connection when the bluetooth turns on, but the Y2 does immediately. The Y2P and the Y2 are running the same drivers for bluetooth and wifi, and appear to have the same wireless card internally. During the failure state, InSSIDer still sees signal strength for my network, but I cannot connect to it. stats: the card that comes in the laptop is an Intel Wireless-N 7260 Intel Bluetooth driver is at 17.0.1401.422 Intel Wireless driver is at 17.0.2.5 Windows 8.1 x64 Home wifi is a Medialink MWN-WAPR150N

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• How to determine most stable Cisco IOS release?

  - by Chris J

  This post is about a Catalyst 4948E switch. I was looking on the download page and realized that there are no "GD" versions available. Are the "ED" versions stable? Even if you change "ED" to "GD" in the URL the IOS images are still the same. http://www.cisco.com/cisco/software/release.html?mdfid=283027810&flowid=3592&softwareid=280805680&release=15.1.1-SG2&relind=AVAILABLE&rellifecycle=ED&reltype=latest Is 15.1 as reliable as 15.0? My devices are currently on the 12.2 train. Is there anything special to upgrade to one of the 15.x trains? Are the configurations compatible.

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• "The connection to the server was reset while the page was loading"

  - by andygeers

  I've just taken over managing the network for a small charity, and am finding internet access very flaky - we keep getting "The connection to the server was reset while the page was loading." errors (HTTP Error 12031 according to the Windows network diagnostic tool). It doesn't seem to be anything to do with our ISP since it also affects internal traffic (even requests to an Apache instance on my localhost!) Adjusting the MTU setting in the Windows XP registry sometimes seems to help for a few minutes after rebooting, but the problem always returns.

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• strange behaviour - dhclient needs to be run twice in order to connect to wireless

  - by splicer

  I am trying to connect my to my wlan without the use of NetworkManager. I run the following commands after boot: iwconfig wlan0 enc <WEP passwd> mode managed essid <name> channel 6 ifconfig wlan0 up dhclient wlan0 At this point, dhclient stalls for ages (perhaps 2 minutes), then it returns with PING 192.168.1.254 (192.168.1.254) from 192.168.1.65 wlan0: 56(84) bytes of data. --- 192.168.1.254 ping statistics --- 3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 3000ms pipe 3 .. The strange thing is that when I run pkill dhclient; dhclient wlan0 right after this, it connects in about <3 seconds. Any idea what could be the cause of this problem? Edit: oh, and I did try using the -timeout flag on dhclient but that didn't seem to make any difference (it still stalled for ages).

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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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• Setting Up My Home Network

  - by Skizz

  I currently have five PCs at home, three running WinXP and two running Ubuntu. They are set up like this: ISP ----- Modem ---- Switch ---- Ubuntu1 -- B&W Printer | |--WinXP1 | |--WinXP2 Wireless |--Colour Printer | |---------Ubuntu2 |---------WinXP3 (laptop) The Ubuntu1 machine is set up as a PDC using Samba and runs fetchmail, procmail, dovecot to get my e-mail and allow me to access the e-mail via imap so I can read the e-mail on any PC. I'd like to set up the network like this: ISP ----- Modem ---- Ubuntu1 ---- Switch ------WinXP1 | | |--WinXP2 B&W Printer Wireless |--Colour Printer | |---------Ubuntu2 |---------WinXP3 (laptop) My questions are: How to configure Ubuntu1 to act as a firewall. How to configure Ubuntu1 to provide a consistant user authentication across the network, at the moment Samba provides roaming profiles for the XP machines but the Ubuntu2 machine has it's own user lists. I'd like to have a single authentication for both XP machines and linux machines so that users added to the server list will propagate to all PCs (i.e. new users can log on using any PC without modifying any of the client PCs). How to configure a linux client (Ubuntu2 above) to access files on the server (Ubuntu1), some of which are in user specific folders, effectively sharing /home/{user} per user (read and write access) and stuff like /home/media/photos with read access for everyone and limited write access. How to configure the XP machines (if it is different from a the Samba method). How to set up e-mail filtering. I'd like to have a whitelist/blacklist system for incoming e-mails for some of the e-mail accounts (mainly, my kids' accounts) with filtered e-mails being put into quaranteen until a sysadmin either adds the sender to a blacklist or whitelist. OK, that's a lot of stuff. For now, I don't want config files*, rather, what services / applications to use and how they interact. For example, LDAP could be used for authentication but what else would be useful to make the administration of the LDAP easier. Once I have a general idea for the overall configuration, I can ask other questions about the specifics. Skizz I have looked around for information, but most answers are usually in the form of abstract config files and lists of packages to install.

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• USB Wireless keyboards not registering Ctrl Alt Delete when computer boots

  - by Donovan

  I've recently installed a new PC at work. Its a Dell Optiplex 9010. I bought a USB wireless keyboard and mouse from Dell and subsequently from Logitech to use with this PC. The Dell keyboard is a model KM632 and the logitech is an mk260. Both units work properly and have decent range. The issue is when the PC boots they keyboard (neither model) will register a Ctrl+Alt+Delete to the PC. I can say for sure the keyboards are still functional as the media keys will still produce a result (notably the sleep key on the mk260). My gut reaction is I'm dealing with an issue in the PC or Windows. I'm not sure where to start though. If I unplug and reinsert the USB dongle both units will work. Also, I don't use both they keyboards at the same time I bought the Logitech fearing the Dell unit was bad. Any ideas would be appreciated.

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• Transient network dropout for Xen DomU's

  - by Stephen C

  We've got a CentOS server running a cluster of virtuals. Occasionally the cluster's internal network drops out for a minute or so ... and then comes back. The problem is somehow related to the actual network traffic, but it is not a simple load issue. (The system is generally lightly loaded, and the problem occurs irrespective of actual load.) The setup: CentOS 5.6 on Dom0, various CentOS on the DomU's Hardware - a Dell R710 with a BroadCom NextXpress 2 NIC (sigh) using the latest drivers for the NIC from BroadCom Xen configured to use network-bridge and vif-bridge Some iptable tweaks to route an unrelated port to one of the virtuals. The system has one externally visible IP address, and Dom0 runs an Apache httpd configured with a number of virtual hosts each of which reverse proxies to web servers running on the virtuals. (The virtuals have to be NAT'ed, primarily because we don't have enough allocated public IP addresses.) The symptoms: Works fine most of the time. When someone tries to UPLOAD a large file to one virtuals, the internal network drops out ... for all virtuals: The Dom0 httpd sees a network timeout talking to the backend server on the virtual and reports a 502. A previously established ssh connection from Dom0 to any of the DomU's freezes. Our monitoring shows ping failures for traffic between virtuals. The Xen consoles to the DomU's do not freeze. No log messages in any log files that I can see, on either Dom0 or the DomU's ... apart from the Dom0 httpd logs. After a minute or so, the problem clears by itself. This is 100% reproducible. What we've tried: Downloading, building and installing the latest BNX2 driver on Dom0 Turning off MSI on the NIC - adding "options bnx2 disable_msi=1" to /etc/modprobe.conf Turning off tcp segmentation offload - "ethtool -K eth0 tso off". Sacrificing a black rooster at midnight. I've exhausted all my options apart from switching to KVM ... or slaughtering more roosters. Any suggestions?

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