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  • How do ISPs/Colocation Facilities limit bandwidth for Ethernet Drops?

    - by Kyle Brandt
    I have switch providers and have run into some problems with bandwidth limitations. I have more bandwidth then before, but there are performance issues. The router is connected to a 100mBit port, but they limit it to arbitrary settings (in software I imagine). It seems when I go above the limit, the provider starts to drop packets beyond the limit (This is what they said they do as well). Is it possible the previous provider did something like queuing packets above the this limit before dropping them? Is anyone aware of not only what can be done, but what is typical? Also, is there anything I can do on my Cisco router to help this situation? It would seem I am pretty helpless if the packets are dropped before they reach my interface (The traffic that is high is inbound to my network).

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  • Can I use an Apple AirPort Express as a wireless-to-wired bridge?

    - by Chris
    I have a wireless network using an Apple AirPort Extreme. That device is set up in my office and hooked up to the cable modem. I have a TV in another room which can accept a wired internet connection (not wireless enabled). Can I use an Apple AirPort Express's ethernet jack to create a wireless-to-wired bridge? If not, what device would I use to do the same thing?

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  • Improve wireless performance

    - by djechelon
    Hello, I have a Trust Speedshare Turbo Pro router, which is running on channel 6. I found that the wireless signal (and network performance) dramatically drops from my PDA (I can barely attach to the network, even if I set the PDA's energy settings to maximum wireless performance) when I even exit my room, and I don't have shielded walls or something like that. I can't even stream a SD video from my desktop (connected via LAN) to my laptop using WiFi, while via LAN it works fine. I read that changing router's channel could improve performance due to interference reducing. I found that almost all wireless networks around here run on channels 6 and 11. I tried to go to my router's settings page to change channel, but I found that the combo box only allows me to select 6!! I'm not sure, but I may have been able in the past to change channel, though not to all of the available channels. A few minutes ago I tried a firmware upgrade, but it didn't solve my problem. My question is Is it possible that my router is someway locked to its channel? I bought it on my own, I didn't receive it from my ISP Apart from boosting the antenna power to the maximum (which, by the way, increases the EM radiation my and my family's bodies absorb 24/7 and is little more environment-unfriendly), do you have any tips on getting high quality transmission up to 5 metres from the antenna? Thank you

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  • Frequent and weird wifi disconnections

    - by Sidou
    How would you explain, troubleshoot (and solve) the following problem? Wifi ADSL modem router D-link 2640R installed in living room at about 1.8m height. Working fine, synchronising and getting/serving stable internet connection. First situation: -Laptop 01 in other end of the house, let's say in room01 southern to the living room, distant by about 15m. Getting stable signal of good to very good quality. No disconnection. -Laptop 02 in room02 opposite to room01 (5m West) which makes it almost at the same distance and direction from the router located 15m North. Getting stable signal of good to very good quality. No disconnection. Second situation: -Laptop 01 moved to room03 Northern to the living room (actually just 3m behind the wall where the router lies). Getting stable signal of excellent quality. No disconnection. -Laptop 02 still in room02 but now experiences frequent disconnections (actually almost impossible to get the Internet even though the signal level is still very good. Either no Internet with the wifi icon appearing connected to access point or no connection established at all which happens every 2 minutes and that means virtually no Internet at all as I can just get a timeframe of 1 minute or so to load any website or even get to the router's web based control panel. If Laptop 01 is completely shut down or its wifi adapters shut down or even still working but its wifi MAC address forbidden, then Laptop 02 has no problem at all. If Laptop 02 is moved to a nearer location to the router, in the living room for instance, then no connection problem occurs even if Laptop 01 is also connected. And also if we move back Laptop 01 to its original location (room 01), then no problem as well. I'm completely lost and don't know how to address this issue. I tried to change the Wifi channel and even tried the auto channel scan but that didn't solve it. I know that the problem is probably coming from Laptop 01 being in its new location or some sort of interference as the problem occurs only under the described condition but I have no idea how to solve it! I also scanned the neighborhood for wifi jam using InSSIDer, there are few other access points but they don't seem to affect the situation. Any ideas about the steps to follow or tools to use ?

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  • Local IP address same as Google's external

    - by GRIGORE-TURBODISEL
    I'm exampling Google's IPs, but you get the idea. What happens if somebody configures a router's LAN address pool to range from 62.231.75.2 to 62.231.75.255, then his computer's IP address to 62.231.75.232 and someone else on the network tries to access Google? Or better off, is there any case in which someone in that network can, by merely attempting to access Google, accidentally bump into another computer on the network?

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  • Divide a network into two subnets of equal size

    - by kylex
    I have been given the following IP 192.168.14.137/25 and asked to divide the network into 2. This is what I've come up with: The subnet mask is therefore 255.255.255.128 The network address is 192.168.14.128 There are a total of 128 available addresses (including the network address and broadcast address) To divide the network we create to subnets: 192.168.14.128/26 192.168.14.192/26 This will have a subnet mask of 255.255.255.192 Am I missing anything, or is this correct?

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  • Testing the load factor in my lab

    - by Ami Winter
    I am a system admin in a lab, I have ~90 computers in the lab and I want to check the load factor on them.. meaning, to check how many people are working on the computers hourly.. To see if I need to buy more computers or not. I am looking for a way to build a script to check if a computer is logged on or not.. (0 for log off - 1 for log on) After I will have this data, I know how to build a script to build me the graphs. All the computers are linked via a domain and most of them have windows XP (few windows 7) I'll be happy to get some help. Amihay

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  • How do I share a complete XP disk so it can be seen from a Windows 7 system? (To move all files to a

    - by Ian Ringrose
    This should be easier! (both computers can see the internet etc so I know the network it’s self is working) I have a normal home network with a Windows XP machine on it and the new Windows 7 (64 bit) machine. So I can transfer the files to the new Windows 7 machine, I wish to share the complete disk (and all files) from the Windows XP machine and access them from the Windows 7 machine. Is there a step by step set of instructions for doing this anywhere? So fare I have: put both computers into the same workgroup put the windows 7 machine into work network mode so it can see the XP machine in the work group shared the XP disk as read only But when I try to access a lot of the folders on the XP disks, I am told I am not allowed to access them. (I was not asked for any passwords by the windows 7 machine when I accessed the XP machine. The XP machine just has its default account with no password set on it) The XP machine runs XP home and hence has "simple file shairing" turn on. So it seems that even if I create a admin account (with password) and connect with that account, it still comes in as "guest" on the XP machine. Chooseing to share the folder I want access to rather then the top of the disk drive seems to work, but is a pain as I need to share each user's folder with a different share name. If the new computer was not a laptop, I would just plug the hard disk from the old machine into it, but being a laptop I don't have that option.

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  • Retrieve a domain name based on an IP Address?

    - by Neil Kodner
    I'm reviewing some apache logs, specifically with respect to downloaded files. I'm interested in knowing, if possible, which domain is responsible for the download, given an IP address. I've given nslookup a try and it seems to (mostly) get the job done but it returns all sorts of extraneous information. Ideally, I pass in an IP and receive a domain back. Before I write a shell script to parse the output of nslookup to capture the domain, I'd like to know if this is the best way of approaching this problem, or if there is a more tried-and-true method of doing this. Specifically, I'd like to know if an address resolves to an amazonaws.com domain. I understand that this might be difficult because EC2 machines are dynamically created and destroyed - I'd like to know if the IP addresses for AWS/EC2/EMR machines fit any sort of addressing pattern.

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  • Duplicate name exists solution

    - by user978733
    I have about 70 pc's with exactly same hardware. I decided to automate turning on and off. I took 1 PC. Here is what I've done: Changed bios configuration so that now pc's waking when I turn on AC switch Installed Windows XP and configured so that I can turn off remotelly, changed workgroup name to "WG1", and pc name to "ExamPC" Then created acronis backup image of this pc I installed this image in several PC's and tried to test All worked well till windows opened. The problem is, all tested PC's started Windows nearly at the same time, and all of them popped up error Duplicate name exist. I can't figure out any solution. Any suggestions?

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  • Logical and Physical network topologies

    - by t.thielemans
    I'm trying to understand the difference between logical and physical topologies but it's a bit confusing to me. Cisco states these as logical topologies, but from my understanding these should be physical topologies? This is what I understand so far: Physical PtP: desktop directly connected to a desktop Multiaccess: several desktops connected to a medium with access to each other (Cisco Ring image, how should I view this in a live situation?) Ring: several desktops directly connected to each other creating a loop? Logical PtP: two desktops (virtually) connected to each other with intermediairy devices in between MultiAccess: (don't have a clue) Ring: (don't have a clue) Could anyone help me out and perhaps explain the difference a bit more detailed? Online I can't find any useful topics. I am using the Cisco Network Fundamentals book.

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  • Bridging two connections in windows 7

    - by Serban Razvan
    I have recently bought an Samsung UE32ES5500 and I want to connect it to the internet. Not wanting to buy an expensive Samsung wireless adapter for the TV, I've decided to use an ethernet cable. Because the Internet cable passes through underground to the bedroom and the TV is located in the living room, i decided to put a router in the bedroom, and receive it's signal in the living room using a windows 7 laptop. Afterwards I connected the laptop to the TV through an ethernet cable, and bridged the two connections in Network Connections in Control Panel on the laptop. The TV successfully finds the laptop (and the router I think) but still cannot connect to the internet. Does anyone knows a solution to this problem? (the connections must be bridged because I want to have only one network in the house)

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  • How can I create a VLAN on my extreme switch for a separate subnet/domain?

    - by drpcken
    I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run updates on every machine on this domain, but I would have plug them into my current LIVE domain to get it internet access. From what I've read having two separate domains on a single subnet is a bad idea (even though it is temporary) so I don't want to risk messing anything up on my production domain. I'm pretty sure I can create a separate VLAN on my extreme 48 port switch and plug this smaller domain into it on a different subnet, but I don't know the commands. Both subnets would need internet access of course (one of the things I can't wrap my head around is routing internet traffic between subnets (gateway is on production subnet). Switch is a Summit x450e-48p My production domain is on subnet 192.168.200.0. My new domain I want to put online would go into subnet 192.168.10.0. A shove in the right direction would be greatly appreciated. Thank you!

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  • PC cannot ping another PC on my home network

    - by Mike C.
    Hello, I am running Windows 7 on my PC, and I am running a Windows 2008 Server VM in Windows Virtual PC. Both machines have network connectivity. However, I cannot ping the VM from the host neither by computer name nor IP. I can ping the host machine from the VM both by computer name and IP. Is there something I need to enable on the VM to allow it to be seen by other machines on my network? Thanks!

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  • Setting a wireless access point on Ubuntu server 11.10

    - by Solignis
    I am trying to setup a wifi access point with my Ubuntu server. I have managed to get my phone to connect the wireless and now it get a DHCP lease. Though it still cannot ping out or get pinged by anything on my network. I am prety sure my problem is iptables, but I not sure what would be wrong. Here is what my rules look like. (The ones pertaining to the bridge interface) # Allow traffic to / from wireless bridge interface iptables -A INPUT -i br0 -j ACCEPT iptables -A OUTPUT -o br0 -j ACCEPT I am guessing my rules are a little lean, the bridge exists on the same subnet as everything else on my network, I am using a 10.0.0.0/24 subnet. EDIT Oh yeah I should mention also, when I do a ping test, I get Destination Host Unreachable as the error.

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  • What router settings to use for wireless home network

    - by Question Overflow
    While looking at the setting of my wireless router, I am bewildered by the array of options available. Despite searching on Wikipedia to try to understand the various acronyms, I am still clueless to decide what is the best setting to use although the default works fine. Rather than calling the internet service provider (ISP) to ask them the correct settings, I hope to learn more about the differences between some of the options listed below, so that I would be able to make a more informed decision from now onwards: PPPoE vs PPPoA LLC vs VC-Mux Bridge vs Routed In addition, I would also like to know the significance of the following MTU VPI VCI And whether or when I should manually specify DNS?

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  • Connecting a print/file server with no wired access

    - by PeanutsMonkey
    We currently have a printer server which also serves as a file server. The server is located on premise however is not close to any wired access point i.e. a patch panel or point. The server also requires access to the Internet as it transmits files across. We have a wireless modem and a wireless router. I can run a cable between the server and wireless router. How can I have the wireless router communicate with the wireless modem? If the operating system of the server is concerned, it is running Windows Server 2003.

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  • How does Subnetting Work?

    - by Kyle Brandt
    How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation). Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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  • 8 Character Device names

    - by Lee Harrison
    Is there any reason to still use only 8 characters in a device name? My boss still uses this rule for printers, computers, routers, servers... basicly any device connected to our network. This leads to massive confusion among users, especially when it comes to printer. It also leads to confusion from an administration standpoint because every device is named vaguely, and similarly(its only 8 characters!). I understand the history behind this and compatibility with older systems, but none of our legacy systems will ever make use of PS-printers and Wifi networks. Is there any reason to still do this, and what is everyone else doing when it comes to naming network devices at an enterprise level?

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  • Sharing internet through a wireless ad-hoc in Windows 7

    - by vzait
    I'm actually requesting a workaround to share a PPoE wired Internet connection between two laptops using wireless. I've tried sharing it the usual way... New Ad-hoc = Click turn On sharing = etc. I've tried changing all the settings I could find related to the two networks on both machines. Conclusion: Sometimes it works, sometimes it doesn't. Is it really buggy, or are my hands growing from the wrong place? I'm almost sure I'm not the only one having this kind of problem. What is the easiest/correct workaround ?

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  • windows cache not working as it should?

    - by piotrektt
    I run windows 2012 server with data center. The setup is with 60GB of RAM. I have one file shared on VHD and when I copy this file locally the RAM cache is all used up but when multiple computers connect to the share it the cache is not used. The network is 8Gb. The whole network is around 200 computers that need to read that one file but on this setup only 10 connection kills the server. Is there any way to check what is going on? What other solution can I use to manage cache in windows?

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