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• Ierrs on Network Interface - Pfsense/Freebsd

  - by JFA

  Hello all, We're using PfSense as an internal router/firewall (no connection to WAN). Using the Web-GUI, under Status --- Interfaces, there's one particular interface where I have some errors: In/out errors 3513/0 I then SSHed to the firewall to validate the info provided by the WebGUI and here's the output: # netstat -ni -I bce2 Name Mtu Network Address Ipkts Ierrs Opkt Oerrs Coll bce2 1500 <Link#3> 00:23:7d:cd:a2:a2 1404522323 3513 749797131 0 0 bce2 1500 10.42.1.0/24 10.42.1.24 6 - 6 - - As you can see, both present the same info (errors on incoming packets). I switched cables, changed network card, changed port on switch and I still see the errors. My 2 questions really are: 1) Is there any way I could get more info on the nature of these errors? or is this all I can get? 2) Should I be worried about this? As you can see, the errors are a VERY LOW percentage of all the total incoming packets. In other words, is this normal on a high-traffic gigabit interface? Thanks! JFA

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• System Idle Process network traffic?-Updated

  - by Moab

  I was using NetBalancer and noticed network traffic on an unidentified service, but when I highlight it and then go to the lower center pane and click the parent process it says it is the System Idle process, it is showing incoming and outgoing traffic in the upper pane, anyone know why this Windows System Idle Process is talking on the network? Windows 7 HP 64bit . . . Edit, after blocking the traffic for that unidentified Service I checked my event viewer (Windows LogsSystem) and found 3 new events that were never recorded before and matched the time I blocked the traffic. So is this part of the Windows local DNS cache? Event ID 1014 DNS Client Events Name resolution for the name dns.msftncsi.com timed out after none of the configured DNS servers responded. dns.msftncsi.com Name resolution for the name wpad.home timed out after none of the configured DNS servers responded. wpad Name resolution for the name mscrl.microsoft.com timed out after none of the configured DNS servers responded. mscrl.microsoft.com . Then My Web Browser refused to work, I re-enabled the traffic and all returned to normal. .

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• Protocol to mount fat32 network filesystem on Linux with ability to lock files ( not advisory locks

  - by nagul

  I have a fat32 filesystem sitting on a NAS storage device (nslu2) that I need to mount on my Ubuntu system. I've tried Samba and NFS mounts, but both don't seem to support proper locking. More specifically, I am unable to save files to the mounted drive through GNUcash, KeepassX etc, which makes the share fairly useless. Is there a protocol that allows me to achieve this ? Note that the NAS storage device is running a linux OS so I can run pretty much any protocol that has a linux implementation. The only option I'm not looking for is to reformat the partition to ext3, which I'm not able to do due to other constraints. Alternatively, has anyone managed proper locking of a fat32 system over the network using Samba ? Or, is advisory locking the best you get with a network-mounted fat32 file system ? I've thought of trying sshfs but I've not found any indication that this will solve my problem. Edit: Okay, maybe I can reformat the drive, but to any file system except ext3. The "unslung" nslu2 doesn't like more than one ext3 drive, and I already have one attached. So any solution that involves reformatting the drive to ntfs, hfs etc is fine, as long as I can mount it on linux and lock files.

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• Problem with network policy rule in Network Policy Server

  - by Robert Moir

  Trying to configure RADIUS for a college network, and have run into the following frustration: I can't set an "AND" condition for group membership of authenticated objects in the network policy rules, e.g. I'm trying to create a NPS rule that says, essentially "IF user is a member of [list of user groups] And is authenticating from a computer in [wireless computer group] then allow access. The screenshot above is the rule I am having trouble with. It does not work as written. The rule underneath it, which is identical in every aspect except the conditions rule, does work. I've tried changing the non-working rule to define each set of groups as "Windows group" rather than specifically as machine and user groups, with no change. With the "faulty" rule enabled and the working one disabled, any attempt to login with a valid account from a machine that is in the wireless computers group gives a 6273 audit event in the windows event log: Reason code 66 - "the user attempted to use an authentication method that is not enabled on the matching network policy". Disabling the "faulty" rule, enabling the other rule and logging in with the same account and computer works just fine.

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• Programmer configuring a new network

  - by David Lively

  I'm in the process of expanding my home network from a couple of laptops on a wireless Verizon FiOS router to include: Linksys 24-port switch Cisco Pix 515 Cisco 3640 router One new development desktop and three new machines to act as a db server, web server and a backup system. My company is moving offices and we've decommissioned some older hardware, which I was able to pick up for the cost of the labor to move it home from the office. The benefits to working with dedicated web and db servers are very valuable to me. I know very little about network topology, other than that everything plugs into the switch, which then plugs into the cheap Verizon router. (Verizon provides a coax connection that the router must translate into Ethernet before I can use it with any of this equipment). Questions: What is the recommended topology for this equipment? Verizon router - Pix - 3600 - switch? Is the 3600 even necessary or desirable? The Verizon router has one WAN port and 4 client ports, all 10/100. Is there any performance benefit at all to wiring multiple connections from the verizon router to the switch, assuming I don't use the Pix? Should I use the Pix? Software firewalls are a pain, and seem silly if I have a device like this lying around. Anything else I should know? Am I wasting my time with this? I also obtained a 7 foot rack, shelves, patch panels, UPS, patch panels, etc, which are going into a conveniently air conditioned closet. All constructive advice appreciated.

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• Network to network VPN Centos 5

  - by Atul Kulkarni

  I am trying to follow "http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-vpn.html#s1-ipsec-net2net" I have come up with the following On local router machine: in my ifcfg-ipsec0: ONBOOT=yes IKE_METHOD=PSK DSTGW=10.5.27.1 SRCGW=10.6.159.1 DSTNET=10.5.27.0/25 SRCNET=10.6.159.0/24 DST=205.X.X.X TYPE=IPSEC I have /etc/sysconfig/network-scripts/keys-ipsec0 file in place. On Remote Machine in the cloud if have /etc/sysconfig/network-scripts/ifcfg-ipsec1: TYPE=IPSEC ONBOOT=yes IKE_METHOD=PSK SRCGW=10.5.27.1 DSTGW=10.6.159.1 SRCNET=10.5.27.124/25 DSTNET=10.6.159.0/24 DST=38.x.x.x with its respective /etc/sysconfig/network-scripts/key-ipsec1 file. The DST in both cases are NAT'd external IPs. Is that a problem? I have made changes for port forwarding as well. When I try to bring the interfaces up it gives me output "RTNETLINK answers: Invalid argument". I am confused now and don't know what more to do? Any place I can digup what parameters were wrong? I really appreciate any help I can get. Thanks and Regards, Atul.

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• Can't access certain web sites - reset router, any ideas?

  - by IniTech

  EDIT: This problem was resolved by my ISP - had to do with damaged fiber in one of their locations. Thanks to everyone that helped. Not sure if this is the right site (I'm a StackOverflow user) so I thought I'd give it a shot. I'm having trouble connecting to certain sites on any of the 3 machines that are on my LAN. The following sites are returning "Problem Loading Page - The connection has timed out" Sourceforge.net CNet.com Microsoft.com OpenDNS.com even my company's webiste I was worried about possible malware/virus, but I don't think that is the case (given the inability to access my company's site and the fact that all 3 machines are having the same issues.) I've tried with IE8, FF, and Chrome I have reset my router (WRT54G) and my machine(s) multiple times. EDIT: It is also worth noting that this page spins constantly and no avatars show up (I'm assuming it is trying to access gravatar.com with no success.) EDIT: I have the same issues directly connected to the modem. So, any router config is probably not the issue I'm a programmer, not a network guy - any ideas?

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• Loss of network connectivity when playing video on Optoma HD180 projector

  - by Jeff Fohl

  Hi Folks - New to Super User, so I hope this question fits in with the guidelines. Very strange problem I am having, and I am at a loss as to how to continue troubleshooting this one. The basic problem is that when I attempt to watch streamed video on a particular display device (an Optoma HD180 projector), my network connectivity drops like a stone to barely measurable levels. This is my setup: I have a Dell H2C 730x running Windows 7 64bit. This particular computer has two ATI Radeon HD 4800 video cards. I have two Samsung 22" monitors connected to one card, and an Optoma HD180 digital projector connected to the other card via an HDMI cable. My internet connection is normally a reliable 6Mbps. The problem I am having occurs when I stream video (or even just browse the web) on the Optoma Projector. When I do this, my internet connection drops to practically zero (just a few kilobits per second). When I move the browser away from the projector, and over to one of my Samsung monitors, the internet connection comes right back. Note that the Optoma projector is on and enabled as a third monitor all this time. I can move the mouse around on the projector without triggering the problem. I tried pinging my router when I was playing a movie on one of the monitors, and I get a 1 millisecond response. However, when I have the movie playing on the Optoma projecter, pinging the router gives me response times in the hundreds of milliseconds, or times out completely. So, it clearly is something local to my machine - and not some sort of throttling occurring down the line. I would think that it is possibly something to do with the HDMI driver conflicting somehow with my network driver (which is a USB-based wireless connection). This one has me really stumped. Anyone have any ideas?

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• Connect to Nonencrypted Wireless Network Using Ubuntu Commands

  - by Tim

  I failed to connect to an open i.e. nonencrypted wireless network using Ubuntu command lines. Here is what I did: $ sudo /etc/init.d/NetworkManager stop * Stopping network connection manager NetworkManager [ OK ] $ sudo /sbin/ifconfig wlan0 up $ sudo iwconfig wlan0 essid "Cavalier High-Speed 866-4-CAVTEL" $ sudo dhclient wlan0 There is already a pid file /var/run/dhclient.pid with pid 10812 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on Socket/fallback DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6 No DHCPOFFERS received. Trying recorded lease 192.168.1.67 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms Trying recorded lease 192.168.1.45 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms No working leases in persistent database - sleeping. $ sudo /sbin/iwconfig wlan0 wlan0 IEEE 802.11bg Mode:Managed Frequency:2.422 GHz Access Point: Not-Associated Tx-Power=27 dBm Retry min limit:7 RTS thr:off Fragment thr=2352 B Encryption key:off Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 I was wondering what the problem is and how I can do it right? Thanks and regards!

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• How can I switch from a custom linux network namespace back to the default one?

  - by Martin

  With ip netns exec you can execute a command in a custom network namespace - but is there also a way to execute a command in the default namespace? For example, after executing these two commands: sudo ip netns add test_ns sudo ip netns exec test_ns bash How can the newly created bash execute programs in the default network namespace? There is no ip netns exec default or anything similar as far as I've found. My scenario is: I want to run a SSH server in a separate network namespace (to keep the rest of the system unaware of the network connection, as the system is used for network testing), but want to be able to execute programs in the default network namespace via the SSH connection. What I've found out so far: Created network namespaces are listed as files under /var/run/netns (but there is no file for the default namespace) The ip netns exec code can be found here: http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/tree/ip/ipnetns.c#n132 - I haven't grasped everything that it is doing yet, but it doesn't look very promising. ip netns identify $$ as suggested by Howto query and change network namespace on linux? returns nothing when in the default network namespace

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• How to rename network printer on Windows 7?

  - by Adrian McCarthy

  This question is similar to How do you rename a printer device in Windows 7 64 bit, except the answers there do not work, and I'll provide more information. This is a home network, not a domain. I have set up a Brother HL-5170DN. It is a network printer connected directly to an Ethernet hub. I can connect to it with Windows 7, but on Windows 7 it defaults to the name "binary_p1 on Brn37415f", which isn't very useful. And I cannot seem to change the name. I have it working with several Windows XP and Vista machines, and I can change the name on those machines. On Windows 7 Printer properties: I can see the "binary_p1" name on the General tab. I can select the text, but I cannot change it. The field is not grayed out, but I cannot type anything into it. On the Ports tab, all of the controls are grayed out (disabled). The selected Port is called "\\Brn_37415f\binary_p1", and it's described as "Client Side Rendering Provider" and the printer field says "binary_p1". On the Security tab, I can see that my account has "Manage this printer" permissions. If I choose Printer Server Properties, I can select the port and click Configure Port, but I get a dialog that says, "An error occurred during port configuration. This option is not supported." I have found many forums with people asking the same question without getting an answer. Update: No more bounties to offer, but I'm still looking for a solution to this problem.

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• Network topology for both direct and routed traffic between two nodes

  - by IndigoFire

  Despite it's small size, this is the most difficult network design problem I've faced. There are three nodes in this network: PC running Windows XP with an internal WiFi adapter.Base station with both WiFi and a Wireless Modem (WiModem)Mobile device with both WiFi and WiModem The modem is a low-bandwidth but high-reliability connection. We'd like to use WiFi for high-bandwidth stuff like file transfers when the mobile is nearby, and the modem for control information. Here's the tricky part: we'd like the wifi traffic to go directly from the mobile to the PC, as rebroadcasting packets on the same WiFi channel takes up double the bandwidth. We can do that with a manual configuration by giving the both the PC and the base station two IP addresses for their WiFi interfaces: one on a subnet shared with the mobile, and one on their own subnet. The routes on the PC are set up so that any traffic going to the mobile via WiModem goes through the secondary IP address so that return traffic from the mobile also goes through the WiModem. Here's what that looks like: PC WiFi 1: 192.168.2.10/24 WiFi 2: 192.168.3.10/24 Default route: 192.168.2.1 Base Station WiFi 1: 192.168.2.1/24 WiFi 2: 192.168.3.1/24 WiModem: 192.168.4.1/24 Mobile WiFi: 192.168.3.20/24 WiModem: 192.168.4.20/24 We'd like to move to having the base station automatically configure the mobile and PC, as the manual setup is problematic when you start having multiple mobiles and PCs. This means that the PC can only have 1 IP address and needs to be treated as being pretty simple. Is it possible to have a setup driven by DHCP on the base station that is efficient with bandwidth?

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• Local Network - Windows 7 and Vista can't see each other

  - by ca8msm

  I've got a strange issue at home that has been bugging me for weeks, but I really need to get it sorted now so I'll detail as much as I can and hopefully someone can spot what might might be wrong. I have a wireless router connected to the internet and 3 devices connected to it. They are: Name OS Network IPv4 PC1 Windows 7 WORKGROUP 192.168.2.2 LAPTOP1 Vista WORKGROUP 192.168.2.3 PS3 192.168.2.4 and they all get their IP addresses dynamically. Both PC1 and LAPTOP1 can ping PS3 and get a response. PC1 and LAPTOP1 are unable to ping each other by ip address unless I ping by their name (which bizarrely shows that it is pinging via the IPv6 address). Also, to confirm this both PC1 and LAPTOP1 can ping each other via the long IPv6 address that they both have so they can obviously see each other just not via IPv4. I've disabled the firewalls on both machines as well to rule that out. I don't really know what IPv6 is used for and I've tried disabling it on both machines but all that happens then is that neither machine can see each other at all then. Does anyone have any idea of what may be stopping them seeing each other, any ways I can look at fixing this, or any network tools that may help identify where it is failing? Thanks, Mark

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• Network programming and Packets interactions.

  - by Eyla

  Greeting, This month I will start working on my master thesis. My thesis's subject is about network security. I need to deal with network interfaces and packets. I've used shappcap before to interact with packets but I'm not sure if C# is the most powerful language to deal with network programing and packets. I worked a bit with winshark and I saw how powerful it is and as you know winsharp is open source developed using C++. I'm not sure if I should use C# or C++ for network security programming and I want your through about the best language might be for network programming and packets interaction. should I use C#, C++, or java or some thing else? please give me your advice. Thank you,

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• How to completely remove a wireless network setup from vista?

  - by 3d1l

  To remove a wireless connection setup I basically go to (network and sharing center) then select (manage wireless network) and then from the list of wireless networks I right click on the one that I want to remove and select (remove network) from the drop down menu. Problem is that when I go to define the wireless network again the system said that the network connection already exist so it seems that even when the wireless network definition is not longer display in the connections list, Vista keeps the configuration somewhere. So How can I be sure that a particular wireless network has been completely removed?

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• OCR with Neural network: data extraction

  - by Sebastian Hoitz

  I'm using the AForge library framework and its neural network. At the moment when I train my network I create lots of images (one image per letter per font) at a big size (30 pt), cut out the actual letter, scale this down to a smaller size (10x10 px) and then save it to my harddisk. I can then go and read all those images, creating my double[] arrays with data. At the moment I do this on a pixel basis. So once I have successfully trained my network I test the network and let it run on a sample image with the alphabet at different sizes (uppercase and lowercase). But the result is not really promising. I trained the network so that RunEpoch had an error of about 1.5 (so almost no error), but there are still some letters left that do not get identified correctly in my test image. Now my question is: Is this caused because I have a faulty learning method (pixelbased vs. the suggested use of receptors in this article: http://www.codeproject.com/KB/cs/neural_network_ocr.aspx - are there other methods I can use to extract the data for the network?) or can this happen because my segmentation-algorithm to extract the letters from the image to look at is bad? Does anyone have ideas on how to improve it?

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• How to scan local network (LAN) for connected devices (Mac OS)

  - by smotchkkiss

  I'm basically looking for something like this but available on Mac. I am trying to connect a new workstation to our wireless multifunction printer and I'm having a hell of a time getting the device to spit out an IP for me to connect to. Is there a way I can scan the network somehow? If it makes a difference, the new workstation is using Mac OS X 10.6 Thanks in advance :)

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• Know any good network monitoring tool for OSX?

  - by sa125

  Hi - I'm trying to keep tabs on my home wireless network. Is there a good, GUI based tool that can show connected machines (make sure I don't have 'guests'), traffic stats, etc. Thanks.

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• Bad ways to secure wireless network c

  - by Moshe

  I was wondering if anybody had any thoughts on this, as I recently saw a Verizon DSL network set up where the WEP key was the last 8 characters of the router's MAC address. (It's bad enough that hey were using WEP in the first place...)

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• config a router to act as a client and access another wireless router/network, wag120n

  - by mihai

  I currently have a WAG120N( http://www.linksysbycisco.com/EU/en/support/WAG120N) router and I would like to know if it's possible to configure it to connect to a different wireless network(WEP with no password) so I can get internet access on it and then to connect a pc to this router(WAG120N) so I can take advantage of the internet connection. Basically I think that my need is a kind of yagi antenna but as I already got this router I would like to know if I can use instead it of yagi . Thank you in advance for any answer !

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• Network is going down once per day

  - by Charly

  Once per day the network on eth0 is going down and we need to do sudo ifdown eth0; sudo ifup eth0 to get the network up. Here is the syslog: Feb 11 12:48:01 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 12:52:35 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 12:56:23 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:00:28 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:04:29 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:09:16 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:13:53 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:18:16 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:22:25 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:26:52 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:30:44 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:31:49 www-tech-1 dhclient: There is already a pid file /var/run/dhclient.eth0.pid with pid 3198 Feb 11 13:31:49 www-tech-1 dhclient: Listening on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:49 www-tech-1 dhclient: Sending on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:49 www-tech-1 dhclient: DHCPRELEASE on eth0 to 131.121.113.228 port 67 Feb 11 13:31:49 www-tech-1 dhclient: There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072 Feb 11 13:31:50 www-tech-1 dhclient: Listening on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:50 www-tech-1 dhclient: Sending on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:52 www-tech-1 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 Feb 11 13:31:52 www-tech-1 dhclient: DHCPREQUEST of 131.121.14.17 on eth0 to 255.255.255.255 port 67 Feb 11 13:31:53 www-tech-1 kernel: [265383.991682] eth0: no IPv6 routers present Please check the last portion of this syslog. Can anybody help me?

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• 2Wire USB Network Adapter Not Working With Windows 7

  - by Andrew

  I installed Windows 7 on a separate drive, and everything works fine, but I can't get the above network adapter to work properly. It's displayed in Device Manager as a USB device, and I have the driver that makes it function in Vista, but when I run the Driver Wizard and direct it to directory where I have the Vista driver, it almost immediately says "Can't install driver." Is there any work around to this?

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• How to block outside network access on a windows 2008 server

  - by David

  I setup a windows 2008 server for some internal stuff (file sharing, sql server, etc). I only need to access the machine from computers that are inside the network. What is the best/easiest way to block all outgoing and incoming traffic on the server?

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• Networking a server with wireless network

  - by Benjamin Harding

  Right, I have a wireless network at home, and a server without a wireless adaptor, I also have upteen amounts of ethernet cables lying around. There is a laptop in the same room as the server, with a wireless connection, would there be a way to connect the server to the internet using the laptop?

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• Networking a server with wireless network

  - by Benjamin Harding

  Right, I have a wireless network at home, and a server without a wireless adaptor, I also have upteen amounts of ethernet cables lying around. There is a laptop in the same room as the server, with a wireless connection, would there be a way to connect the server to the internet using the laptop?

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