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• I need access control within the same network/VLAN

  - by Sadiq ali

  Hi, I have a single network/VLAN and I want to block some traffic and allow some traffic in my network, is this possible using a L2 or L3 switch? If so which switches support this feature and what would be the commands to configure this? I have already tried this using access lists by applying it to an ethernet port but if I apply it on one port it will automatically work on incoming traffic on that port but I mean it to work on only outgoing traffic as per my ACL. Do you have any suggestions please?

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• No External Network Access Through Ubuntu VPN

  - by trobrock

  I have setup pptpd as my VPN server on Ubuntu Server 9.04, I am able to connect to the VPN from the client and can access the server's local network, but I am unable to connect to the external network via the VPN. If I login to the server via SSH: $ ping google.com PING google.com (74.125.67.100) 56(84) bytes of data. 64 bytes from gw-in-f100.google.com (74.125.67.100): icmp_seq=1 ttl=49 time=65.9 ms 64 bytes from gw-in-f100.google.com (74.125.67.100): icmp_seq=2 ttl=49 time=63.2 ms 64 bytes from gw-in-f100.google.com (74.125.67.100): icmp_seq=3 ttl=49 time=63.9 ms 64 bytes from gw-in-f100.google.com (74.125.67.100): icmp_seq=4 ttl=49 time=66.0 ms If I connect to the VPN and ping locally: $ ping google.com ping: cannot resolve google.com: Unknown host I have a feeling it is some routing issue on the server but I am unsure.

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• Setting up a very mixed Active Directory network to work with PowerShell Remote Administration

  - by erictheavg

  Summary: I want to be able to monitor the computers on my network, but don't need it to be automated. We're too small to purchase anything like MOM, but too big to do anything manually (~100 machines in two locations). I just keep running into issues, and was wondering if there's a master list of Group Policy settings I can distribute to my environment to get Remote Powershell working. Environment: Our AD network is pretty mixed. The end users have XP SP3, Win 7, and Win 7 x64. The servers include Win2k3 SP2, Win2k8, Win2k8 x64, Win2k8 R2, and Win2k8 R2 x64. Details: I'm trying to get it to work with Remote Powershell, but I run into errors like the following: Connecting to remote server failed with the following error message : The WinRM client cannot process the request. Default authentication may be used with an IP address under the following conditions: the transport is HTTPS or the destination is in the TrustedHosts list, and explicit credentials are provided. Use winrm.cmd to configure TrustedHosts. Note that computers in the TrustedHosts list might not be authenticated. For more information on how to set TrustedHosts run the following command: winrm help config. For more information, see the about_Remote_Troubleshooting Help topic. + CategoryInfo : OpenError: (:) [], PSRemotingTransportException + FullyQualifiedErrorId : PSSessionStateBroken Then I go to the computer (Win2k3 SP2 server) and run winrm quickconfig per the recommendations via google, and it says: Make these changes [y/n]? y WinRM has been updated to receive requests. WinRM service started. WSManFault Message = The client cannot connect to the destination specified in the request. Verify that the service on the destination is running and is accepting requests. Consult the logs and documentation for the WS-Management service running on the destination, most commonly IIS or WinRM. If the destination is the WinRM service, run the following command on the destination to analyze and configure the WinRM service: "winrm quickconfig". Error number: -2144108526 0x80338012 The client cannot connect to the destination specified in the request. Verify that the service on the destination is running and is accepting requests. Consult the logs and documentation for the WS-Management service running on the destination, most commonly IIS or WinRM. If the destination is the WinRM service, run the following command on the destination to analyze and configure the WinRM service: "winrm quickconfig". That's right. It tells me to remedy my winrm quickconfig failure by running winrm quickconfig. I don't want to band-aid this project one google search at a time. I'm sure there is a step-by-step tutorial out there on how to set up a network for powershell remote administration. Does anyone know of one? Books are acceptable. Thanks in advance! I didn't think my question would get this long.

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• VPN Network intermittantly fails to provide internet: What could be possible causes

  - by Jake M

  We have a small office with our own VPN setup. We occasionally experience failures in our internet connection where we cannot access the internet. Most of the time the internet connection will resume by itself(without me doing anything) after a period of time(10 mins). Would you be able to suggest possible causes of the connection failure so I can then go and run some tests? Our network architecture is like so: A 'Billion' brand router that is connected to the internet via phone cable and then connected to our Cisco Switch A Cisco Switch/Bus which is connected to all our office nodes, our external harddrive and also to our router as stated above. All connections are via ethernet cable A series of work computers(nodes) connected via ethernet cable to the Cisco switch. Our ISP is TPG Australia We have a Virtual Private Network All the ethernet cables are about 3 years old Do you think that the causes of our intermittant connection problems could be due to the following: Data collisions in the ethernet cables Old/Faulty ethernet cables Our ISP has bad service Can you think of any other causes of the problem?

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• Booting off windows image through network

  - by Mr. Sir King Osman

  I have a HP st5742, which is a tower that does not have a hard drive and I am trying to boot it off the network, preferably off an image. It was designed along with the program HP Image Manager, however this program has been discontinued by HP and I can not seem to find a way to get a copy. If this helps, I am running my network with windows server 2008 R2 and would like the streaming client to be running windows. I have spent days searching for a way to deploy this machine however I can not seem to find a straight forward program, guide, or way to do this. I am new to this sort of thing but I willing to reading into the subject, all I need is a point in the right direction. Any help would be greatly appreciated.

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• Setting up multiple wireless access points on same network

  - by SqlRyan

  I'd like to add wireless to my network, and I need multiple access points to cover the whole area. I'd like to set them up so that there's only one "wireless network" that the clients see, and it switches them as seamlessly as possible between access points as they wander around (if that's not possible, then at least have it so that they don't need to set up the security by hand on each one the first time, if possible). I've searched online, and there are quite a few sets of mixed instructions (same vs different SSID, frequency, does the security need to match exactly, etc.). Can somebody who has some experience doing this please let me know what they did? I imagine it's pretty simple, but there seems to be no clear cut "yes, you can do this" online, even though I know you can. I have a mid-size LAN with about 20 workstations and two Domain Controllers on it. Also, I'll be doing this with consumer wireless components, if it makes a difference, not enterprise-level components (ie. Linksys rather than Cisco).

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• Debian Lenny - network interfaces(eth) are in DOWN state

  - by pachanga

  Folks, I'm facing a very weird problem with one of my production servers(it's Debian Lenny) - after reboot network interfaces(eth0,eth1) are in DOWN state. Looks like an Intel based networking adapter is installed on the server, lspci lists it as follows: Ethernet controller: Intel Corporation Device 10c9 (rev 01) The kernel driver responsible for this adapter is "igb". I tried "modprobe -r igb && modprobe igb", network interfaces first disappear then appear, but they are in DOWN state again. What could go wrong? It used to be working just fine. How can this be fixed?

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• Connect to internet through DC with 2 network interfaces

  - by Ali Foroughi

  I have a network like this : Client 1 <== Wireless ==> Access Point <== Wire ==> DC <== Wireless ==> ADSL Modem Client 1 : IP : 192.168.1.181 DG : 192.168.1.100 DNS : 192.168.1.100 Access Point : IP : 192.168.1.10 DG : 192.168.1.100 DC : IP : 192.168.1.100 DG : 192.168.1.1 DNS : 127.0.0.1 ADSL Modem : IP : 192.168.1.1 I can ping yahoo.com from client1, but cannot browse the internet. UPDATE1 : my DC has two network interfaces that I bridge together. UPDATE2 : I powered down the DC firewall UPDATE3 : I set a forwarder for my DC to 8.8.8.8 (Google dns)

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• SQLServer 2008 Fails to start under NT AUTHORITY/NETWORK SERVICE account

  - by braincells2pixels

  Not sure what changed but looks like my security credentials have been monkeyed with. Since yesterday evening after I disconnected from our corporate network and rebooted my laptop at home, I am unable to start the instance of SQL2K8. The service is set to run under NT AUTHORITY\NETWORK SERVICE account. The event log records an Access Denied error on the Master.mdf. Switching the account to Local System starts the service but our application runs into security errors. Any clues? TIA

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• Process for configuring network settings on a headless rack mount device

  - by PherricOxide

  I'm with a small company that plans to sell a rack mounted network appliance which is configurable via a web interface (think of a router configuration page sort of deal), and I'm wondering in large data center like environments what the process usually is for the initial setup of such systems. The main question is, if the system is headless, how do you get initial remote access to it? Do companies usually first plug a server into a monitor/keyboard/mouse in order to configure the network settings before mounting it in a rack? How else would they know what the IP address of the machine was if DHCP (and it can't be hard coded because of IP conflict potential)?

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• Probability of failure with larger number of network elements

  - by MikeKulls

  I'm having a discussion with a work colleague. I'm saying that a network with 100 elements will have pretty much 10 times as many failures as a network with 10 elements, ie a tech will need to replace faulty hardware 10 times more often. He suggests that the failure rate doesn't go up in a linear fashion and the failure rate will be significantly less than 10x, in fact only slightly more failures. This is not the probability of an outage etc, we are just talking in relation to the amount of parts that a tech would need to swap out in a given time frame.

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• Accessing guests on virtual network when connected to host via PPTP

  - by Viktor Elofsson

  I'm setting up a development machine which runs Ubuntu 12.04 and KVM for virtualization. I have a guest running Ubuntu 12.04 which can be accessed from the host via its IP address which is assigned by libvirt. The guest can also access the internet, no problem there. However, now I want to setup PPTP so I can connect to the host (from my workstation running Windows 7) and directly access guests without relying on SSH port forwarding. I can connect from my W7-machine to the host (PPTP), but I cannot access any virtual machines (which are accessable from the host directly). Relevant configuration files cat /etc/network/interfaces auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address x.x.x.x broadcast x.x.x.x netmask x.x.x.x gateway x.x.x.x # default route to access subnet up route add -net x.x.x.x netmask x.x.x.x gw x.x.x.x eth0 virsh net-edit default <network> <name>default</name> <uuid>xxxxxxxx-72ce-3c20-af0f-d3a010f1bef0</uuid> <forward mode='nat'/> <bridge name='virbr0' stp='on' delay='0' /> <mac address='52:54:00:xx:xx:xx'/> <ip address='192.168.122.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.122.2' end='192.168.122.254' /> <host mac='52:54:00:yy:yy:yy' name='web1' ip='192.168.122.11' /> </dhcp> </ip> </network> cat /etc/pptpd.conf (commented lines removed) # TAG: option # Specifies the location of the PPP options file. # By default PPP looks in '/etc/ppp/options' # option /etc/ppp/pptpd-options # TAG: logwtmp # Use wtmp(5) to record client connections and disconnections. # logwtmp #(Recommended) localip 192.168.122.1 remoteip 192.168.122.234-238,192.168.122.245 cat /etc/ppp/chap-secrets* # Secrets for authentication using CHAP # client server secret IP addresses xxxxx * yyyyyyyyyy 192.168.122.100 I get the correct IP address when connecting my W7-machine, but when I try to ping the virtual machine at 192.168.122.11 I get Reply from 192.168.122.1: Destination port unreachable. It's probably something trivial I'm missing but I can't for the life of me figure out what it is. So I'm turning to you, serverfault.

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• Network keeps disconnecting - Repairing solves it. Router configuration

  - by Joao Carlos

  My network connection keeps going insane, it will keep normal applications connected, like TeamViewer and MSN, but webpages will stop loading (Problem loading page). Everything looks connected and works like a charm, but webpages and new connections wont work. If I press "Repair" in the network connections to restart the adapter, it will work. This happens on WIRED and WIRELESS connections, both on Windows and on MacOSx. I have had this for years (different computers, routers, cities), but I never figured it out. I learn to live with it, but, I think theres probably a solution. What must I be doing wrong if this keeps happening? You guys have same thing?

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• Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

  - by mcfrosty

  I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• Amusing or Sad? Network Solutions

  - by dbasnett

  When I got sick my email ended up in every drug sellers email list. Some days I get over 200 emails selling everything from Viagra to Xanax. Either they don't know what my condition is or they are telling me you are a goner, might as well chill-ax and have a good time. In order to cut down on the mail being downloaded I thought I would add all of the Junk email senders from Outlook to my Network Solution mail server. Much to my amazement I could not find that import Spammers button, so I submitted a tech support request. Here is the response: Thank you for contacting Network Solutions Customer Service Department. We are committed to creating the best Customer experience possible. One of the first ways we can demonstrate our commitment to this goal is to quickly and efficiently handle your recent request. We apologize for any inconvenience this might have caused you. With regard to your concern, please be advised that we cannot import blocked senders in to you e-mail servers. An alternative option is for you to create a Custom Filter that filters unwanted e-mails. To create a Custom Filter: Open a Web browser (e.g., Netscape, Microsoft Internet Explorer, etc.). Type mail.[domain name].[ext] in the address line. Login to your Network Solutions email account. Click on the Configuration left menu tab. Click on the Custom Filter link. Type the rule name. blah, blah, blah Basically add them one at a time. "We are committed to creating the best Customer experience possible." No you are not. You are trying to squeeze every nickle you can out of me. "With regard to your concern, please be advised that we cannot import blocked senders in to you e-mail servers." Maybe I should apply for a job to write those ten complicated lines of code... Maybe I should question my choice of vendors, because if they truly "cannot" then they are to stupid to have my business. It is both amusing and sad. I'll be posting this in every forum I am a member of.

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• How to install network drivers during installation?

  - by Matt

  I have a server that I'm attempting to install windows onto. However, the disk is an iscsi target provided by ipxe. Everything appears to go well until about 3/4 through the install process I get an error about a critical driver missing and the installation is cancelled. I would say the critical driver would be the network card. It's an intel nic and the drivers are not on the windows installation CD. I tried slipstreaming them with RTSevenLite, but after it created the CD it seems it failed to make it bootable. I've also not been successful in making a bootable USB thumb drive or USB HDD. I suspect a buggy bios even though I have the latest. How to install network drivers during installation? Windows used to provide an optional F6 during install feature but this seems to be missing in Windows Servert 2008. Perhaps there is a way to do this, or another method?

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• Windows 7 offline files - work temporarily offline even if network connection works

  - by Robert

  Sometimes I am connected via VPN to a network containing the server where files are stored which are cached by Windows offline files feature. Sometimes the connection works good and working this way is not a problem - on other times working is quite a pain because of high latency when working with the files in the Windows explorer. Is there an interactive way how a user (with admin permissions) can temporary suspend online usage of offline files? I already activated the "Transparent caching" group policy feature (Computer Configuration Policies Administrative Templates Networks Offline Files) with a network latency of 200msec but from my experience even if I get ping times to the file server of less than 40msec online usage is quite tenacious. Setting low latency times at this point causes the offline files often to toggle which makes problems with some applications working with several files and requires them to be consistent (like SVN client).

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• Cannot find the "Create Network" menuitem in the WiFi icon menu in Mountain Lion

  - by Chuancong

  I am using Mountain Lion Developer Preview 2. I cannot find the "Create Network" menuitem in the WiFi icon menu in the menubar. It was there before when I was using Lion. It started missing since I upgraded to Mountain Lion Developer Preview 1. By the way, is there any other method to create an ad-hoc WiFi network on OS X? I tried to use Internet Sharing via WiFi, but other devices using the shared connection could not find the Mac in their local networks. I am using an early 2011 MacBook Pro 15'. Thanks.

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• Connecting a Mac to the office network

  - by user36501

  Hi All, I am busy preparing to start working with a Mac at work - in addition to my old PC. Just wondered, is it difficult to setup the Mac to run on the office network - i.e. does it need any special settings or servers or anything like that? and also printers...can I use the network printer as normal. I am just pottrying to think ahead of any ential issues. Also share drives...will I be able to access share drives and my backups to these shares drives - all a bit daunting! Btw in case you didn't notice I am a Mac Nube lol

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• One Mac computer with multiple network connections?

  - by Kyle Lowry

  I have a Mac (OS X 10.5) that I would like to connect to a dedicated/isolated Internet connection (one that is not connected to the LAN), and a LAN. The LAN is set up with its own, separate, Internet connection which is shared by several dozen computers (and is quite slow). I want to set it up so that the Mac uses its own dedicated Internet connection (on a different account with a different company) for its Internet access, but can still access the local area network as well. How can I configure the Mac & the network to allow this?

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• Wireless network unavailable, no networks found after Windows update

  - by jacobsee

  Old Dell Inspiron 8200 laptop with Linksys Wireless G network adapter card (WPC54G v2). Wireless connection was working fine. Then I ran a bunch of windows updates, I think the last one was the recent .NET 3.5 service pack update. Now wireless networks won't connect. Using windows to manage wireless, no networks show up. I'm typing right now on another laptop where wireless is working fine. I've restarted router & Dell laptop several times. Tried to Repair wireless connection and refresh network list. Also restarted DHCP and WZC service, all to no avail. I then uninstalled .NET 3.5 SP (don't remember number) and .NET 3.0 SP2. I don't remember all the windows updates that I just ran because I haven't used this laptop in a while so had to catch up on some updates.

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• Connect devices plugged into Raspberry Pi ethernet to WiFi network

  - by Tom

  I'm just starting out on a mission to learn more about networking and I've followed a tutorial (http://raspberrypihq.com/how-to-turn-a-raspberry-pi-into-a-wifi-router/) to turn my Raspberry Pi into a wifi router. That worked really well so I modified it slightly so that I can use a tethered iphone for the internet connection - I just switched all "eth0" references to "eth1" (the iphone interface) and added a script to set everything up when the phone is plugged in. This setup has freed up the Pi's ethernet port so I'd like to try and take this a step further and allow devices plugged into it to connect to the network. If possible, I'd like to try adding a switch so I can connect multiple devices. I've tried fiddling around with nat & iptables with no luck so my question is, how can I connect devices on eth0 to my wlan network?

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• Web 2.0 online network diagram image generator

  - by JavaRocky

  Does any web 2.0 online network diagram generators exist? Thanks.

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• sar command to generate only CPU utilization and network statistics in Linux

  - by Vijay Shankar Kalyanaraman

  I want to be able to generate the system activity report every 30 seconds or every minute and store in a file and use it for diagnostic purposes on my VM. So I give an output file for the sar command and read it using the "-f" option. But I only use the CPU utilization and network utilization part of the report and so rest is all that I don't want to save (waste the space in the disk to store these reports). Also the sar files that are generated are all binary. Is there a way to collect these stats for the CPU and network utilization alone? and so save almost 2/3rds the space on the disk?

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