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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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• how to build network across buildings ?

  - by Omie

  Hi ! I need some help in building a network between hundreds of computers spread across multiple buildings of my college. Yes, I'll be doing this as a part of my college project. Please see this image, it will give you enough idea of what I'm trying to achieve. http://i.imgur.com/rOohx.png All the computers in all buildings should be able to connect server. Once network is up, there will be a set of services over intranet and network use will be moderate. well, say there will be an email server and a http server. My point is, I cannot afford much of performance loss. It feels easy to connect computers inside 1 building to each other, however, I'm clueless as to how to connect all of them to server. I mean, just 1 cable won't be enough to connect 1 building to server, right ? How should I go with it ? I am not expecting detailed configuration. Just heads up will do :) Thanks

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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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• Subnetting design for a new building?

  - by Zombie

  A building with 4 floors, each floor is divided as follows; 15 users for accounting, 15 users for finance and 15 users for marketing (i.e 45 user in each floor). Data center is located on the ground floor, with 45 servers to be divided into 15 for all the accounting users in the four floors, another 15 for the finance and the last 15 for the marketing. (i.e each 15 server for each one of the above categories are separated from the other 15 and so on) What is the proper subnetting design for such scenario? Knowing that we are allowed to use anything we want!

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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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• Is this one network or two networks?

  - by colemik

  I have this simple question and really don't know the answer. Does the drawing below show one network or two networks? This is a question about the definition of a network from the OSI / TCP/IP model point of view: From one point of view, those are two L2 networks connected with a bridge. From another point of view, this is one L3 network, that can have a common L3 address space (like 10.1.1.0). PS If this question is too dumb, please move it to Superuser.

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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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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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• Macbook not connecting to WIFI

  - by Model Reject

  I have been having this problem all week. My Macbook aluminium can't see my wifi network. I have changed the channel to one that isn't being used by neighbours and my iphone picks it up straight away. In other words, the router is fine. It's just the macbook can't see it. This is driving me nuts if anyone can help... My airport card details... Card Type: AirPort Extreme (0x14E4, 0x8D) Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.1) Locale: ETSI Supported PHY Modes: 802.11 a/b/g/n Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 Wake On Wireless: Supported The funny thing is that is was intermitent on Saturday. I had to keep restarting router and it worked for about 5 minutes, now it doesn't connect or see it at all. Tried using kisMAC and it can't see network either. Thanks, C

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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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• 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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• 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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• How to retrieve connection details of CheckPoint SSL Network Extender?

  - by amoe

  My workplace uses a Java-based VPN tool named CheckPoint SSL Network Extender. I would like to configure the VPN connection myself using stock OS tools, because I find the applet to be rather unstable. How would I go about getting all of the connection details needed to manually connect to the VPN? My workplace only supports the official client. When I am connected with the Java applet, if I run ipconfig /all I can see that a hidden network connection is created named Check Point Virtual Network Adapter For SSL Network Extender - Packet Scheduler Miniport. I can see the various IP and DNS details there as well. However, because I need to log in to the applet-based tool, I presume I need to export some kind of key in order to use OS tools to configure this. Is this even possible? Answers for any OS are great although I am using Windows XP to test, and also want to use Linux clients.

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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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• Cannot connect to a shared network drive

  - by dublintech

  I am using windows 7, I cannot connect to a shared network drive on another machine. I can ping the machine. I can remote desktop connect to the machine. The machine is on the same subnet My friend with the exact same laptop as me (and on the same network, same workgroup) can connect to the shared folder. The machine I am trying to connect to and my friends machine can both see shared folders on my machine. I also cannot see shared folders on the friends laptop. When I select diagnose, windows tells me nothing useful. When I select see details on the error pop up, I see: Error code: 0x80004005 (google doesn't help much) I can nbtstat -a the machine who has the shared folder. When I try with my firewall turned off the same happens. I have ensured my windows 7 has all updates. I run security essentials to ensure my laptop is clean. I run ccleaner to clean up my registry. Same error. I have tried with my laptop on both wireless and ethernet. As you can imagine, I am banging my head against the wall on this one.

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• Internet Connectivity... Help please!

  - by James

  Hi. My Laptop is having trouble connecting to my wireless router. Other laptops are using the wireless, but it's not reached capacity. The laptop recognises (with a strong signal) that there is wireless internet, and I can connect via the router with a cable because this happens automatically. My problem is this... When I click "connect" (for example in the network and sharing centre), the dialogue box closes and nothing else happens - as though "connect" is being read as "exit". I am running Vista on a Toshiba Satellite Pro P300. Any help would be very much appreciated, Thanks

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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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• command line bandwidth limiter for windows

  - by jackhab

  Please, recommend network bandwidth limiter for windows which can be controlled from command line. No need for fancy options, only limiting of overall up and down traffic of a host required.

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• Where is this error message coming from?

  - by jordanpg

  Recently switched to a new ISP after a move, running Chrome under OSX 10.7. I see the following error when visiting various sites -- no particular pattern -- from time to time. This is the entire message. It is the only thing that appears in my web browser. The problem fixes itself in a few minutes. Probably a lookup error of some sort, but I don't recognize it. What piece of software is serving this message? What is happening? What is this Reference # referencing? Invalid URL The requested URL "/articles/6517181", is invalid. Reference #9.6f200f6c.235618518a.b7e910cf

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• Multiple network interfaces and UDP packets distribution

  - by Robert Kubrick

  I have a Linux server with 2 1Gb network interfaces eth1 and eth2. If I start 2 clients listening to the same multicast address and each client connects through a different NIC (say client 1 listens to the multicast through eth1 and client 2 through eth2), then client 2 gets duplicate UDP packets. If both clients use the same interface eth1 on the other hand, both clients work fine. I have already tried to set arp_filter and proxy_arp to 1 (arp flux issue) but it hasn't solved the issue. Is this a Linux kernel problem? Or is there another way to setup the interfaces correctly?

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• Windows 7, network transmit (send) not working

  - by user326287

  My Win 7 works 2 years without problem. But now, I can't transmit (send) big data on LAN/Internet. I can: - Ping anything - Browse Internet, download files at full speed - Send e-mails with very small attachments. - Testing download speed on Speedtest.net, measure stable full speed. I can't: - Testing upload speed on Speedtest.net. Upload stuck.. - Save/send email messages with big (128k) attachment, independent from e-mail provider or e-mail box. THIS IS NOT A HARDWARE/CABLE/CARD OR OTHER NETWORK DEVICES PROBLEM! When I boot from a Linux Live CD, without ANY hardware change, all data sending, testing works correctly, at full speed. I have tried already in Win 7: - Disable Windows/3rd party Firewall completely - Reset IP stack parameters (netsh int ip reset c:\resetlog.txt) - Computer restore - Reinstall LAN driver When I inspect the packets in Wireshark in Windows, I see lot's of (maybe 60% of sent packets) "TCP Retransmission". Sometimes receive "TCP Dup Ack" or "TCP Out-of-Order". Linux don't do this. Thank you for the help.

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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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• Windows 2008 Server network issues

  - by Snowflow

  I have this one server that just doesn't want to be on the internet It's a new server, a twinblade, the other twin works, but not this one. It can connect fine to everythign else in the LAN, but cannot go out on the net It can be reached by ICMP requests over the net (the nagios server can probe it, but not ping it for instance), but not TCP Everything seems fine both in firewall and machine, i get no issues. Anyone care to help me out where i can start looking, i'm seriously confused. edit: it can ping gateway and through the sonicwall site to site VPN, it\s also able to resolve DNS. the only thing it can`t do is reach anything outside of LAN/VPN

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• Hosting website when port 80 is taken?

  - by cinqoTimo

  A few months ago, we purchased an R-HUB unit to replace WebEx for remote support. The device operates through port 80, ehich doesn't appear to be configurable. I know in IIS, you can specify a port besides port 80, but the problem is in the port forwarding. On our router, we have to map an incoming port to the forward port which then directs traffic to the node (webserver). However, the incoming port for both the webserver and the R-HUB is 80 - and the server seems to be getting confused as I can only get to the R-HUB, not the website. How can I expose both devices? Host header headers? DNS config?

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• Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

  - by cappie

  I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I protect my calling-bill now is by using 32 character passwords, but I would much rather have a way to protect The firewall script I'm currently using is stated below, however, without the established connection firewall rule (mentioned rule #1), I cannot receive incoming audio from the target during outgoing calls: #!/bin/bash # first, clean up! iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD DROP # we're not a router iptables -P OUTPUT ACCEPT # don't allow invalid connections iptables -A INPUT -m state --state INVALID -j DROP # always allow connections that are already set up (MENTIONED RULE #1) iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # always accept ICMP iptables -A INPUT -p icmp -j ACCEPT # always accept traffic on these ports #iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 22 -j ACCEPT # always allow DNS traffic iptables -A INPUT -p udp --sport 53 -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -j ACCEPT # allow return traffic to the PBX iptables -A INPUT -p udp -m udp --dport 50000:65536 -j ACCEPT iptables -A INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT iptables -A INPUT -p udp --destination-port 5060:5061 -j ACCEPT iptables -A INPUT -p tcp --destination-port 5060:5061 -j ACCEPT iptables -A INPUT -m multiport -p udp --dports 10000:20000 iptables -A INPUT -m multiport -p tcp --dports 10000:20000 # IP addresses of the office iptables -A INPUT -s 95.XXX.XXX.XXX/32 -j ACCEPT # accept everything from the trunk IP's iptables -A INPUT -s 195.XXX.XXX.XXX/32 -j ACCEPT iptables -A INPUT -s 195.XXX.XXX.XXX/32 -j ACCEPT # accept everything on localhost iptables -A INPUT -i lo -j ACCEPT # accept all outgoing traffic iptables -A OUTPUT -j ACCEPT # DROP everything else #iptables -A INPUT -j DROP I would like to know what firewall rule I'm missing for this all to work.. There is so little documentation on which ports (incoming and outgoing) asterisk actually needs.. (return ports included). Are there any firewall/iptables specialists here that see major problems with this firewall script? It's so frustrating not being able to find a simple firewall solution that enabled me to have a PBX running somewhere on the Internet which is firewalled in such a way that it can ONLY allows connections from and to the office, the DNS servers and the trunk(s) (and only support SSH (port 22) and ICMP traffic for the outside world). Hopefully, using this question, we can solve this problem once and for all.

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