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• Network outage caused by SMC8013WG Cable Modem/Router ?

  - by mkocubinski

  At work, we have a basic Class C Network. The gateway/router is a SMC8013WG (stock comcast commercial cable modem), and simple unmanaged switch (HP Pro Curve 1400 24G). The SMC8013WG is our default gateway as well as DHCP server. Periodically, I'd say almost every other day.. the entire network will just stop responding. I won't be able to ping/see the gateway, any computers on our local network, or anything on the internet. The only way to fix this is to unplug the Comcast cable modem, wait, and plug back in. This unfailingly fixes the problem. But this doesn't make much sense to me.. shouldn't the network still be fine locally, since everything is plugged into the switch anyway? Why would resetting the router fix this? Can anyone suggest anything to check to in order to narrow this problem down? Just to be clear.. here is the basic topology: { Internet } -- (12.345.67.89) Comcast Cable Modem (192.168.1.1) -- Switch -- 192.168.1.2-254 P.S. Our IT guy is in about 3 hours a day every other week or so, so.. we're kind of on our own most of the time.

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• Cannot enable wireless Ubuntu 10.04

  - by woaddoa

  I have recently installed Ubuntu 10.04, however I am having trouble getting wireless to work. Ubuntu says that wireless is disabled, and I am unable to enable it. I have tried Administration Hardware Drivers however the only drivers listed are Nivida graphics ones. I am unsure what to do as I do not think the process is the same as searching for drivers for a windows machine. Any advice appreciated.

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• Potential impact of large broadcast domains

  - by john

  I recently switched jobs. By the time I left my last job our network was three years old and had been planned very well (in my opinion). Our address range was split down into a bunch of VLANs with the largest subnet a /22 range. It was textbook. The company I now work for has built up their network over about 20 years. It's quite large, reaches multiple sites, and has an eclectic mix of devices. This organisation only uses VLANs for very specific things. I only know of one usage of VLANs so far and that is the SAN which also crosses a site boundary. I'm not a network engineer, I'm a support technician. But occasionally I have to do some network traces for debugging problems and I'm astounded by the quantity of broadcast traffic I see. The largest network is a straight Class B network, so it uses a /16 mask. Of course if that were filled with devices the network would likely grind to a halt. I think there are probably 2000+ physical and virtual devices currently using that subnet, but it (mostly) seems to work. This practise seems to go against everything I've been taught. My question is: In your opinion and  From my perspective - What measurement of which metric would tell me that there is too much broadcast traffic bouncing about the network? And what are the tell-tale signs that you are perhaps treading on thin ice? The way I see it, there are more and more devices being added and that can only mean more broadcast traffic, so there must be a threshold. Would things just get slower and slower, or would the effects be more subtle than that?

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• Cisco 861 Router forces one-to-one NAT

  - by Slurpee

  I have a cisco 861 router that only allows one-to-one NATs in order to access the Internet. I would like for computers to get an address via DHCP from this router, and be able to access the Internet without needing to set a static NAT to one of my public IPs. What is wrong with the configuration? I have a basic understanding of the IOS CLI, most of the configuration file (edited for content) was created by my company's long gone Senior Network Engineer.

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• Choose source interface for PPTP VPN on Ubuntu

  - by Emyl

  I have an Ubuntu Virtualbox guest with two network interface, eth0 (NAT) and eth1 (bridged). I want to connect to a PPTP VPN using eth1, but I don't know how to specify which interface to use. If i just try: sudo pon myvpn nodetach It fails with: Using interface ppp0 Connect: ppp0 <--> /dev/pts/1 Modem hangup Connection terminated. Looking at routes with route seems to indicate that eth0 is being used: x.x.x.x.no 10.0.2.2 255.255.255.255 UGH 0 0 0 eth0

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• My iPhone, Macbook and Laptop won't connect to 192.168.1.*

  - by 1Rabbit

  Previously I could connect perfectly with my iphone to my web server on 192.168.1.* but since I got a MacBook, I now can't even connect my iphone to either of the computers. I can connect to the wifi hub on my iphone, I can connect to the wifi hub on all the computers including my phone. Neither of my computers nor my iphone 5 can communicate with each other. What has happened? I've tried number of different local web servers, even tried the osx web server, but my iphone just wont connect to any.

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• How can I solve Windows PPTP VPN issues?

  - by Robin M

  I'm having persistent problems with Windows PPTP VPN connections. The VPN appears up whilst the tunnel won't transfer traffic (ping to a remote IP within the VPN works for a while, and then fails). The client receives routing information via DHCP. When the connection fails, the routing table is still correct so I don't think it's a routing problem. My internet connection is via an ADSL2 line. There's software to deal with PPTP problems, like TunnelRat, but I don't want to install v1.1 of the .NET framework and I'd rather get to the bottom of the problem (I have multiple VPN connections and some are more unreliable than others). What can I do to get to the bottom of this? Alternatively, what can I do to keep the connection alive?

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• Static IP on Wifi at work and dynamic at home?

  - by Jason Shultz

  I need the laptops at my office to have a static IP for security purposes and identification. However, some employees take their laptops home in the evening. If I have the wifi config set to use a static IP, how can they have a dynamic IP at home? the laptops are using Windows Vista and Windows 7.

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• hosting website on a private network

  - by razor

  i'm currently running a website off 3 linux servers. I'd like to setup a private network and only allow port 80 traffic to one of the servers. I'd also like to setup a vpn so only I can access the servers via ssh or any port for developing/debugging. How hard is this to setup and what do I need to get? Do enterprise/commercial routers have vpn functionality built in? how do I handle DNS? eg- www.mydomain.com would need to point to the router, which forwards traffic to the webserver. Do I set the A record to the router, and somehow tell the router which server to send the http request to? And how would I make server1.mydomain.com resolve to server1 within the private network (without editing host files)? Would I need to run my own DNS (eg- powerdns?) to do this?

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• VMware vSwitches and spanning tree

  - by dunxd

  I have two redundant core switches I want to connect to a new vSwitch I am setting up on a VMware ESX host. The switch will have two physical NICs each of which will connect to one of the core switches. The core switches are connected. If this was a physical switch, I would worry about connecting it to both core switches, because this would create a network loop. Do I need to worry about this for a VMware virtual switch? VMware's documentation says it is not possible to connect two vSwitches in a loop, therefore STP is not required. However, I am worried about connecting two physical switches together via a vSwitch.

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• how to design LAN connectivity between private and corporate ?

  - by maruti

  there is a bunch of servers connected to shared storage in a private LAN (10.x.x.x). this privateLAN is managed by a windows server (DHCP, DNS and directory services). how can these hosts be accessed from outside of this privateLAN? Eg. Remote desktop. can the NIC2 on each of the hosts be connected to the other public LAN (compromising speed or security? what are improtant considerations: additional hardware? like switches? routing&DNS software?

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• Can i change the subnet on the vpn side of a server without having to change its whole lan (to avoid collission)

  - by Gusty

  Ohai, ive got a xp server with a client connecting via VPN. Problem (as we all know) is that sometimes the subnets clash. Instead of changing the whole server network every time this happens, cant i just have the server appear to have a different subnet to vpn clients? I have no interest in accessing other computers than the server on its LAN. I tried just turning off automatic dhcp in the servers vpn settings and changed it to 172.31.255.x. The client gets the address assigned alright and it can ping 172.31.255.1 but i cannot ping the server name (because the dns on the clients vpn connection points at 192.168.0.1?) wisdom? PS everything worked until the client hit a network with the same subnet as the server lan. thanks

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• Windows 7 can't reconnect network drives on startup

  - by Znarkus

  Hi! I have this annoying problem that Windows 7 won't reconnect to my network drives on startup. The shares are on an Ubuntu machine. I've tried every possible solution I've found: Enable password on logon to give the network interface time to boot up Check Connect using different credentials Tried both options in this screen Sorry for the long post. Can You please help me to solve this?

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• WIndows Hosted Network

  - by Nandakumar V

  I have created a hosted network in my windows7 system. The netsh wlan show hostednetwork command gives the output Hosted network settings ----------------------- Mode : Allowed SSID name : "rambo" Max number of clients : 100 Authentication : WPA2-Personal Cipher : CCMP Hosted network status --------------------- Status : Started BSSID : xx:xx:xx:xx:xx:xx Radio type : 802.11n Channel : 11 Number of clients : 1 xx:xx:xx:xx:xx:xx Authenticated But I have forgot the password for this connection and after some googling I found the command netsh wlan refresh hostednetwork YourNewNetworkPassword. But on executing this command it get the error C:\Users\user>netsh wlan refresh hostednetwork rambo123 Invalid value "rambo123" for command option "data". Usage: refresh hostednetwork [data=]key I have no idea what is wrong with this command.

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• lan extension over wide area

  - by avinash

  when we use technology like leased line to extend a lan over a wide area(like when connecting two offices such that hosts in both offices use private ip addresses) , why do we use encapsulations like ppp or hdlc...what can't we use the ethernet header to communicate because mac addresses are unique and can easily be used to identify hosts just like a small area lan... this question may seem a bit absurd but it has been bugging me...so plz explain

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• Why should I use a switched network over routed?

  - by SRobertJames

  Now that routers are affordable, why should I build a network using Layer 2 switches, which degenerate to broadcasting under poor conditions, and not just use real routing at Layer 3? Edit: Got some great replies. Let me clarify the question: Of course, at the lowest level, you want to plug your end nodes into a switch, not a router (as demonstrated by AlReece). I'm referring to switches which are used to bridge traffic between segments - that is, switches connected to other switches.

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• What are the methods of separating network spaces in a LAN?

  - by dash17291

  Please detail me the methods. My thoughts: put the servers in separate (sub)networks the servers are forced to go through the firewall but no NAT is required assign more IP addresses to the internal interface of the server choosing gateway addresses from the clients and servers IP address ranges split DNS Netfilter/{iptables, ipset} could be heavily involved, I'm talking about Linux servers. See for example: Destination NAT Onto the Same Network from internal clients Please do not explain what is NAT or DNS. This is a theoretical question, but my poor English knowledge prevent me to describe it in a fancy fashion.

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• Problem with Lenovo x200s Wifi under Ubutu Karmic

  - by oneself

  Hi, I have just gotten my Lenovo X200s laptop, and I am install Ubuntu 9.10 Karmic on it. The installation went through without a hitch, but I can't get my wifi to work. lspci | grep Network Produces the following results: 00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03) 03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10) The weird part is that when I turn the wifi hardware stitch on and off on the side of the laptop, I get the following printed in /var/log messages: Dec 30 23:24:48 temp-laptop kernel: [ 213.432302] usb 4-2: USB disconnect, address 2 Dec 30 23:24:52 temp-laptop kernel: [ 217.276310] usb 4-2: new full speed USB device using uhci_hcd and address 3 Dec 30 23:24:52 temp-laptop kernel: [ 217.441759] usb 4-2: configuration #1 chosen from 1 choice Does Ubuntu think my wifi card is a USB device? Am I missing some driver? What can I do to fix this? Please, help!

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• Windows 8 Hidden Downloading? Slow Internet?

  - by EApubs

  After upgrading to Windows 8, im facing a very slow download speed. My router and the NIC is working fine because on the same PC I also have Linux. In Linux, everything works fine. When checking through the task manager, it shows that the system use the full bandwidth 1Mbps even without a download. The process menu doesn't show whats taking much bandwidth. The bitdefender's firewall also shows network activity. Is there any hidden apps downloading? How to fix this?

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• network administrator

  - by deepak11589

  i want email ID of good network administrator so that i can ask my question. If any one can help with it would be a great help.

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• Need reasonably priced router with QoS support [closed]

  - by ULTRA_POROV

  I dont need wireless. I am expecting very heavy traffic, with possibly thousands of tcp connections open at one time. This would require that the router has good hardware. I also need to limit the different services i will provide. Lets say i need to guarantee 60% of all the bandwidth to HTTP, 10% FTP, and 10% for Mail... So the router software must have flexible QoS options as well. I don't know which one to chooose, because this information is usually not given on the router specs.

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• peer to peer disk image transmission

  - by JackWu

  Installing linux/windows through pxe works smoothly for me. But downloading images(especially windows) is a headache. Let alone the time, bandwith usage is horrible. And p2p tech comes to my mind. But I have no clue how it works or where to start. Anyone knows how to setup p2p local network, and applies that on image transmission? Any advice, tutorials or experiences will be great. Thanks in advance.

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• No internet through a web browser but Skype still works

  - by kim3er

  We get our office broadband through a BT Business Broadband WiFi router. We have a mixture of macs and windows PC/laptops connecting to it at any one time. All devices are able to connect to the wireless signal with pretty much full signal. However, only two computers (one windows, one os x) are able to consistently connect to the internet. The other three (one windows, two os x), while they can always connect to the wifi, exhibit one of three characteristics. No internet at all. Programs like Skype work, but no internet through a browser. Internet works, but with intermittent lag when switching between different sites. I'm assuming while trying to resolve different addresses. Ignoring point 1 for moment, my gut is telling me DNS. It is an up to 20MB line that usually gets to between 13MB and 15MB downstream. The router is capable of dealing with the amount of wireless devices that we're throwing at it. Has anyone got any suggestions for how I might further diagnose this problem (preferably in OS X)? Rich

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• FreeBSD Jail own network stack with vimage

  - by bodokaiser

  I want to throw all services from the host system and put them in jails. Unfortunatly this doesn't work for file sharing (e.g. nfsd) because the jails don't have there own network stack by default. I know read something about vimage which would solve this issue. See more in this thread: http://forums.freebsd.org/showthread.php?t=9006 The use of vimage with raw jails should use moreorless but the use with vimage and ezjail makes it hard. Does anyone have experience about this topic and wants to share it? Regards

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• Will the removal of NAT (with the use of IPv6) be bad for consumers? [closed]

  - by Jonathan.

  Possible Duplicate: How will IPv6 impact everyday users? (World IPv6 Day) As I understand when we have finally made the switch to IPv6 not only will NAT be unnecessary but it is incompatible with IPv6? Will that mean that ISPs will have to serve multiple IP addresses per customer? Will they provide a range of addresses for each customer or as each device connects will they get an IP address that isn't necessarily near that of the other devices in their house? But overall will this be bad for the Internet users? as surely it will allow ISPs to see exactly how many devices are being used, and so allow them to charge for the use of additional IP addresses? And then if that happens, what happens when you try to connect an extra device to your network? Will it simply not get an IP address? In my home we have about 15-20 devices connected at once, but for places where there are hundreds of devices, it seems like the perfect opportunity for ISPs to charge more? I think I may have it completely wrong, so is there somewhere where there is an explanation of who things will work when IPv6 becomes the norm?

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