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• Cisco Router 1921

  - by mytempfw

  I'm very new in networking and I'm trying to setup my network as follow [ISP Modem/Router/Switch] + --- + {fxp0} [Linux Firewall] {fxp1} + --- + {??} [Cisco Router 1921] {GE 0/0} + --- + [Cisco Switch] + ... Servers {GE 0/1} + --- + [Cisco Switch] + ... Servers My questions are, Since I'm using both GE 0/0 and GE 0/1 ports to connect to switch, how can I connect my Linux Firewall (Port fxp1) to my Cisco Router? I know the USB and Console port are for configuration, can I use AUX port to connect my firewall (if so is it consider a right way)? Is my setup is right? if not can someone please explain to me to do the setup in right way. Link to the picture of my router: Cisco Router 1921 Thanks

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• Keyboard Slow on a high power machine.

  - by Tim Pierson

  I am having a terrible time with my high powered machine. The keyboard is not displaying the keys as quickly as I type. Sometimes I have to wait up to a minute for the key to display. When I type ahead it sometimes loses characters. I am not sure where to start looking for this problem. It started about a month ago and I still have not figured out why. It does not always do it. But acts up about 2-3 minutes out of ever hour of use or thereabout. How can I look to isolate and find the problem, and solve it?

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• Enable/disable wireless interface in a bat file

  - by Herms

  Is there a way to enable/disable a wireless network interface via the command line (so I can put it in a bat file)? When I'm in the office I use a wired connection, but Windows still occasionally bugs me about my wireless connection not being connected (even though I turned off the option for notifying me when there's no connectivity). I'm guessing the only way to stop it from bugging me is to disable the interface, but I'd rather not have to go into the network settings every time I need to do so. I'd like to set up a bat file or a shortcut that I can use to enable/disable the wireless (preferably a single one that toggles the current state), and then just set up a keyboard shortcut for that. I just have no idea how to do so from the command line.

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• IP issue with Heartbeat & DRBD

  - by adam0345

  I'm in the process of setting up 3-node stacked DRBD, and i'm experiencing a rather bizarre issue. Two nodes are located at the data center, and the 3rd node is located locally. The Primary and Secondary nodes are working as expected, however the 3rd node won't connect to the primary. If I ping the IP provided by heartbeat on the 3rd node it will return 100% packet loss, if I reset networking interfaces, ping will then return a few successful packets, but then stop returning any packets. I can't work out any reason why this would be behaving like this. All nodes are running Debian Squeeze, and the latest version of DRBD.

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• Very slow accessing printer shared from Windows Machine

  - by Tarski

  How do I go about debugging a networking problem where the office printer is shared off a Windows XP PC and is very slow from me to access? Print/changing any settings can take several minutes and applications often display "Not Responding" in this time. My machine is a Windows Vista PC. The other PCs in the office are either Vista or XP and do not suffer from any printing problems. I am not experiencing any other network related problems, I can access the web and e-mail fine. The printer is a HP officejet Pro 8000

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• Is it possible to sync specific router settings across multiple routers?

  - by Betard Fooser

  I recently purchased a second Linksys wireless routers set up on the other side of my home and I am wondering if it is possible to somehow sync particular settings between the two? For instance what I am really after is the "MAC Filter List". I would "like" to be able to maintain the list on both routers without having to manually type in the field values. maybe this isn't possible, or has an easy answer, but hopefully those of you who know will cut me a bit of slack. I tried to "google" the answer to this of course, but it seems any searches with the words "sync" and "router" and/or "wifi" result in pages of people having issues with synching their iOS devices over wifi. I would say that have decent amount of networking knowledge in regards to average home networks, and I imagine in larger businesses / corporations they must have a "simpler" way of maintaining things like this. Any insight to point me in the right direction will be much appreciated.

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• Is there a way to reliably backup and restore a complex network configuration on Windows XP?

  - by djangofan

  I have some Windows XP laptops (10+) that host a ad-hoc WIFI network connection to wireless PDA devices. The laptop itself is connected via a 3rd party VPN radio network. The radio network itself seems to be reliable. If one small thing goes wrong with the network configuration then the PDA loses connectivity and so I need a way to backup a networking config , either via a script or a 3rd party program, so that I can restore a working network configuration if something goes wrong. Is this possible? Does anyone have any ideas?

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• How a router decides destination of packet?

  - by user58859

  I have basic networking question. Scenario : Two pc's are communicating on a wan. Both the pc's ate behind routers or modems. My question : Both the pc's have public IP of each other. That public IP is most of the time is either of the router or of the modem. There can be more then one pc's behind those routers and modems. Then how the pc's are communicating. I can understand the packets can reach upto those routers or modems. But what after that. In the packet , destination IP is public IP. Then how the router or modem decides where to send the packet? Can anybody explain me this please. Thanks in advance.

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• PC don't start the and no beeps from BIOS on power on

  - by doug

  Hi there A friend just brought me hi's PC because it doesn't start. I have no bios beeps, no screen activation. The monitor stays blank and nothing is on the display. Does anyone knows how can we fix this? Any ideas? Thank you!

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• Setting up the metasploitable in virtualbox

  - by SetSlapShot

  I'm supposed to try and use kali to do exploits on metasploitable, but I'll burn that bridge when I get there. My question right now is: How do I set up a host only network on virtualbox? I heard that it was unsafe to run metasploitable in bridged networking mode, that host only or NAT is better. When I run metasploitable on NAT, the kali box (attacker) has the same ip address as the metasploitable box, and nmap doesn't really return anything except what I can only assume would be a scan of its own ports? I tried to create a host only network in virtual box. I left the adapter settings at the default, and unchecked DHCP server. now when I run ifconfig on the metasploitable box, there is no ip address listed. Am I setting up/connecting to/not configuring the host only network correctly?

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• solaris + EMC + power-path

  - by yael

  please advice - when I run powercf command on my Solaris machine , which changes this command do on the EMC storage , or on Solaris file system ? from maanual page: DESCRIPTION During system boot on Solaris hosts, the powercf utility configures PowerPath devices by scanning the HBAs for both single-ported and multiported storage system logical dev- ices. (A multiported logical device shows up on two or more HBAs with the same storage system subsystem/device identity. The identity comes from the serial number for the logical device.) For each storage system logical device found in the scan of the HBAs, powercf creates a corresponding emcpower device entry in the emcp.conf file, and it saves a primary path and an alternate primary path to that device.

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• HDD not detected whenever first power on (detected at BIOS level)

  - by Alvin Lim

  I am using Asus P8H61-M LX Motherboard with latest version of BIOS: 4401 One SATA-3 Western Digital Black Series 1.5TB is attached to SATA port 0 A Samsung 22x DVDRW SATA drive attached to SATA Port 1. ps/2 Logitech mouse and keyboard. CPU is i3 with DDR3 8Gb RAM. no other devices are installed. My problem is that when I turn on the computer, the WD HDD is not detected. ie cannot be booted. I have to press ctrl+alt+del in order to get it detected. I'd used the WD data lifeguard software to scan the HDD, the smart status is OK, the surface scan does not show any error at all. Where did I do wrong? Any advice is greatly appreciated.

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• BSOD after PC has been running for a while

  - by user1389999

  I'm having a problem where my computer is getting a blue screen. I have noticed that the BSOD happens after the PC has been running for about 2 days. The BSOD's seem to be an error with atikmpag.sys with an error code of 0x00000116. The problem started about a month ago.It has happened all five times that I left my computer on that long in the past month. Because my computer is a pre-built one from Dell, and I had upgraded the graphics card (at least a year ago) to a more demanding one, I replaced the stock 360W power supply that came with it. I replaced it with a more powerful, 680W one, because it seemed like the problem could be related to a lack of power supply wattage, but it didn't affect the problem at all. Here are the minidump files for the five BSOD's that I have experienced: https://dl.dropbox.com/u/3488338/bsoddumps.zip System info: Windows 7 Home Premium x64 Dell Studio XPS 435MT Radeon HD 5670 (Version 12.4 of the Catalyst driver) Intel Core i7 920 2.67 GHz 6GB of RAM

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• Blank screen after grub menu

  - by Tim

  I just rebooted an Ubuntu Server 10.04. After choosing boot options in the grub menu, though, it just displays a black screen with the blinking white underscore in the upper-left corner. The machine has had (hardware) trouble with networking before, but the problem remains after 10 minutes, so I don't think it's the problem now. Booting into recovery mode or using earlier kernels yields the same problem. This also happens if I boot from another hard-drive. I haven't yet tried to boot from CD as the machine lacks a CD reader. How should I diagnose the problem? Update: My boot options are: recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 567[redacted] linux /boot/vmlinuz-2.6.32-29-generic root=UUID=567[redacted] ro quiet splash initrd /boot/initrd.img-2.6.32-29-generic Update: Also, I cannot access the virtual terminals (ctrl+alt+Fn).

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• Linux and Windows machines sharing a network

  - by Saif Bechan

  I have different Windows and Linux machines that share an internal private network. From within this network I can SSH to every machine etc. This internal network works great. I have my main windows machine from where I control these machines either trough SSH or virtual desktop. Is there a way for me on my main machine to see all the machines that are connected to the network. I want to be able to see all the machines and maybe browse them, share files etc. I am very new to networking of this kind so any recommendations are welcome. Should I set up this network by workgroup? I do not think Linux supports that. Or should I set up the network with domain, I never did that before.

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• Proccess of carrying out a BER Test

  - by data

  I am subscribed to an ISP supplying a 3meg ADSL line. Lately (for the last 4 weeks) speeds have dropped from the usual average downstream speed of ~250kbps to just 0.14Mbps (according to speedtest.net) and employees are complaining about lack of access to the server. I have been calling customer support and logging calls for the last 3 weeks, but they have been unable to determine the source of the problem other carrying out a few bitstream tests and checking the DHCP renewal times. I am going to call back and suggest carrying out a BER test. What type of equipment is needed to carry out this test? I have access to a wide range of Cisco networking equipment. Other: We dont need a leased line as there are less than ten employees.

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• trouble loggin into a Mac share from a Windows PC on the network

  - by villares

  I have this mixed network and usually log into the Macs from the Windows XP home machines and vice versa. I have no real networking knowledge, things just seem to work, more or less, with the default settings. Now I've got a new Snow Leopard Mac with a shared folder (added the user names of the Windows users at the sharing preferences) and the trouble is some machines can open the share and others can't. I can't see the difference. It feels like some Windows machines have a "cache" and won't ask for the share password, just deny access. I can also see old shares proposed at the Windows "add network place wizard".

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• Create a linear trend line in Excel graphs with logarithmic scale

  - by Redsoft7

  I I have an Excel scatter chart with x and y values. I set the logarithmic scale in x-axis and y-axis. When I add a linear trend line to the graph, the line is not linear but appears like a curve. How can I make a linear trend line on a logarithmic-scaled chart? Sample data: x: 18449 22829 25395 36869 101419 125498 208144 2001508 14359478 17301785 y: 269,09 273,89 239,50 239,50 175,13 176,73 151,94 135,15 131,55 121,55

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• Does a single LACP channel over multiple switches increase redundancy?

  - by Sirch

  I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been to a single switch, with a redundant channel to another port. Without getting into vendor specifics, my thought is that as this is a single LACP, the likelihood that an event or change could lead to a wide service outage. Without having the spare equipment or time to test this single channel over diverse switches, could anyone with a greater networking knowledge than myself, tell me if there a network side event that would bring down the network connectivity to a server that had created a bonded interface to two ports on separate switches? Does the use of bonded ethernet channels across multiple switches (that we are advised that we can use) from the server, provide both improved throughput (unquestionably), and improved redundancy (uncertain). Could/would network events such as switch failure, port migration, patching, recovery, etc, cause the channel for both server network interfaces to be unavailable? Thanks in advance.

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• How can I make the NetworkManager work?

  - by Yang Jy

  I am running a version of RHCE6 on my laptop, and lately I've been trying various stuff about network configuration through command line. Last night, I tried removing the NetworkManager using "yum remove NetworkManager" from the system, so that I could have more control of the network through the command line. But the result is, I didn't manage to configure the wireless connection through wpa_supplicant, and I need wireless connection during my travel to another place. So I need the wireless function back as soon as possible. I typed " yum install NetworkManager", some version installed, but I don't get to have an icon on the taskbar, and of course, the network doesn't work. The package I previously removed(about 24MB) was much larger that the one I just installed(about 2MB), so I think some dependencies must be missing. How could I install all these dependencies? Please help!

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• I believe I need a wireless access point, but can I do it with a wifi router?

  - by Flotsam N. Jetsam

  My needs are simple, I think: I have a laptop upstairs with a usb wifi that I use to connect to my neighbor's wifi which I share (with their knowledge). I have a laser printer downstairs that my wife doesn't wants to stay down there (big, bulky and ugly), but that we both need to print stuff off. It has wired networking and I have wired hub and router down there. The usb wifi on the laptop has absolutley the best reception I've ever seen or heard of. I cannot get onto the neighbor's net with the thing downstairs though--sortof in the ground. What do I need downstairs to give printer access to my laptop wirelessly? One thing I can't do in this solution is have a computer on downstairs, so I would think that would eliminate a usb solution.

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• VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

  - by Spirit

  Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ports but when we plugged the cable in one of the ports the link simply does not wanted to activate :S... Does anyone with more VMware experience have ever had similar problem? From what I know is that 1Gbps NICs are backwards compatible with 100Mbps switches. This is what we've tryed so far but with no success: Tryed: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004089 Tryed to modify the /etc/modules.conf folowing the guide from this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=813 After the changes I have restarted the networking services using # service network restart, # service mgmt-vmware restart and # service vmware-vpxa restart It seems that no matter how many times, or whatever approach/method (GUI or Shell) we try to change the speed and duplex of the network adapter and to force it to 100mbps it only accepts 1Gbps .. I am starting to go nuts :@

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• Windows 7 reboot and freezing, possible power problems?

  - by mikelbring

  My Gateway LX Series desktop is about 6-8 months old. When I bought it, it had Windows Vista. I then put the RC version of Windows 7 on it. About 3 months after I bought it, it would randomly start to reboot, actually just shut off. I monitored the temperature levels and they seemed normal. So I installed a fresh Windows 7 Ultimate OEM 64bit. It actually got worse and would reboot more frequently. I then contacted Gateway and they said my machine was built for Windows Vista (made me chuckle), and told me to update my BIOS. So I did, and it was fixed for a good couple months. Recently, it started to do it again. Now I noticed early on it was doing it most often, if not every time when I was either watching a flash video or playing a flash game. So I decided to download the drivers again and I also downloaded my motherboard drivers. Seemed to be okay. A week later it started doing it again. And now it's doing it even more frequently. Sometimes I would turn it on, login into Windows and *BAM!* it would shut off. Now I am at the point where I can hardly get it to turn on. It would freeze at the point where it says "Starting Windows", with the Windows logo. Sometimes it would say "Checking disk for consistency" or whatever and freeze there (not shut off, just freeze). I even got the prompt to launch startup repair. But that also freezes when it says starting Windows. It does not really freeze, just never loads up. I am kind of lost as to what's going on. I have a few ideas but nothing I want to pursue (graphics card? hard drive?). Another thing I did try was to boot into a live disk of Ubuntu and try to launch every program I could and get on the internet but I never got it to reboot. So it sounds like to me it's a Windows thing, but I have no idea. I am just stuck and would like to see if any one has any ideas or could lead me in the right direction.

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• Mouse Hang with voltage fluctuation

  - by user265495

  I bought a new assembled PC about a month ago, but for the past 7 or 8 days I found my mouse cursor hangs every time there is a voltage fluctuation on my UPS (I guess it as when sound comes from ups then mouse hang for 2 or 3 sec. and them it goes normal again). My PC also seems to shut down while I'm working and it refuses to boot again - I end up needing to switch off my UPS and press and hold the power button for 30 seconds. It will then boot as per normal. Could the trouble be with my PSU? Am I potentially damaging my computer by pressing and holding the power button? I have : Motheboard : intel Chipset Model - DH61WWAAG23116-303 Processor : Intel Core i3 3.20 Ghz RAM : Zion 4 gb DDR3 HDD : 1 tb GRAPHICS : 2 gb NVIDIA GeForce GT-610 CABINET : Frontech Rock OS : Win 7 32 Bit

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