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• Device that connects to a switch via RJ45, that emulates a PC

  - by Mike Christiansen

  One of my co-workers once saw a device that plugged into a RJ45 jack, that emulated a PC. It could be configured with an IP address, and respond to pings. I was wondering if anyone knew about these, or even what they are called? This will be used to simulate a PC in a classroom environment. Thanks in advance. Edit: This is a CCNA classroom, we are looking to simulate a PC connected to an ethernet port on a router. These will be on different subnets, etc. This might be doable with a VM through VLANs and virtual switches, but then we are getting away from configuring the physical ports on the router the way we want to.

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• How to use OpenVPN through a restrictive firewall?

  - by R.L. Stine

  I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used through a reasonably-firewalled connection. I have tried: OpenVPN running on the standard port OpenVPN running on port 443 (I start OpenVPN manually from the command line on the VPS and see that the server reports the connection being closed almost immediately, I assume this is a result of DPI on the firewall) STunnel running on port 443 to access OpenVPN and evade DPI. This is the most successful and allows a connection and internet access through the VPN for ~10-20 seconds, before the connection is forcibly closed. Is there anything else I can attempt?

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• What is the correct network configuration for a devStack VM (virtualbox)?

  - by Olivier

  Usually when I setup a new Ubuntu VM, i keep the eth0 in NAT mode to get the internet & I add a eth1 interface in HostOnly mode so that I can ssh. But using this devStack guide : Running a Cloud in a VM, it looks like it tried to use eth0 as the public interface (install got stuck because eth0 lost the network). I know an OpenStack setup usually requires two NICs, so I'm wondering what is the correct configuration for my VM.

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• Network connection via USB

  - by Fco

  Can I get my Nexus One/Android on my local network over USB instead of WiFi and browse to my computer's IP address, the one to which the phone would be connected to, via USB? For instance, let's say my computer has an IP address 100.1.1.1 and when I go to it from the computer I would go to my localhost and see a website I've set up locally in the computer. Then, I connect my phone to that computer via USB. Can I then go to 100.1.1.1 from the browser and see the same website? All this through the USB, no WiFi?

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• Setting up Relays in Windows

  - by Auditor

  I'm trying to setup a pivoting relay with netcat on Windows, replicating a scenario easily possible by using pipes in Linux. Assume machine A can route to machine B and machine B can route to machine C. If machine A needs to route to machine C, we can setup a relay on machine B which can pivot data back and forth for us using command redirectors and spl filetype pipe. Assume: machine C has nc -nlvp 3306 -e cmd.exe machine A has nc -nlvp 80 IF machine B was Linux we could have done mkfifo pipe nc -nv 127.0.0.1 80 0<pipe | nc -nv 127.0.0.1 3306 1>pipe so on machine B if we do nc -nv 127.0.0.1 80 0<&4 | nc -nv 127.0.0.1 3306 1>&4 Per this site, I should be able to achieve what I can with Linux, but unfortunately it is not working.

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• Using a second Wifi Router (in order to use a LAN port)

  - by Sledge81

  Problem: Connecting a TV decoder via Internet. It doesn't have inbuilt wifi so wired LAN is the only option. I bought a second Wifi Router so I could use its LAN port to create a wired internet connection to my decoder. What I want to achieve: The second Wifi Router should basically pick up the signal from the main wifi router. I would then use the LAN port to connect (with a wire) to the TV decoder. In other words have my secondary Wifi Router act as an access point, which will enable me to use a wired LAN connection to the decoder. What i've done so far: Connected the second Wifi Router to my laptop via the LAN ports. Access 192.168.1.1 and went into my second router. 1) SSID set to the same one as the main Wifi Router 2) Tried disabling DHCP and enabling DHCP (with the DNS and default gateway configured the same as the main router). When I check my network connections, I see the LAN connection too but it says 'Not connected to the internet' while the Wifi (main router) shows connected. Can someone please advise on how to use my second Wifi Router to connect to the main Wifi Router (and thus the Internet). Thanks. main wifi router: Zyxel secondary wifi router: TP Link

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• Website ocasionally does not load on first click

  - by tfe

  Today I noticed that my website hosted on a virtual server ocasionally does not load on first click. I click on some link, browser starts loading page but nothing loads and does not not appear any error message (like "connection reset by peer etc). Nothing. When I click the same link again, page loads immediately. The same situation on 2 computers in different browsers. It happends not always, maybe on each 20... or 30 click. Sites from other servers load without this problem. Any ideas what can cause this problem?

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• Network-related icons suddenly removed

  - by Velcro

  Hello, On a fresh Windows 7 installation, I created some shortcuts icons to network shares on the Desktop. Without any warning, these icons are sometimes and randomly deleted from Desktop. I totally don't understand what it happens! They are not hidden, they just are simply deleted. This behavior occurs on one computer in my company. Others Windows 7 computers are not affected by that. And also it's the first time I encounter that. Do you have an idea about this problem? Thanks.

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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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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• VirtualBox bridged network not working as expected

  - by iby chenko

  I am having hard time getting Bridged network to work with VirtualBox. Idea is to have host as well as one or more guests on same LAN. Using NAT (default) I do get access to internet and any node on the LAN when working from one of the VM guests. However, no LAN node including host can access (or ping) guest in VM. I need to be able to use any guest as if it was a physical computer on the network (need to be accessed by any machine on LAN). According to my understanding of the VirtualBox documentation, this should be Bridged mode. I think I set it correctly, well, actually there is not much to it: 1. select Bridged mode in VM network setup 2. select physical NIC of the host to connect bridge to 3. start VM When I do this, each VM does get new IP address that corresponds to LAN settings : 192.168.1.100 192.168.1.102 192.168.1.103 etc. where host is 192.168.1.80 / 255.255.255.0 (IP addresses above 100 are served by DHCP server). This seem to be correct based on what I know about ethernet. From VM I can ping other nodes like 192.168.1.50 etc. and I still get ethernet access. So far so good... But I STILL cannot ping any of the other VMs (running ones of course). I cannot ping them from other VMs, from host or from other nodes on the LAN. Aside from fact that IP addresses handed to guests are now local, this still acts same as NAT. What is going on? What am I missing? Regards, I

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• Network connectivity issue

  - by kubiej21

  I am a novice cisco user and I am trying to investigate as to why one of our connections went down. We have a fiber network ring that is operating just fine. Connected to this ring via ethernet, is a lone 3560. This connection has worked flawlessly for the past year and a half. This morning, I noticed that I could not connect to that remote switch. I checked the configurations on both switches, and nothing has changed (as I expected). In the field, the port lights were flashing, indicating that some sort of communication is occurring. There is only 1 ethernet cable that has been run between these two locations, so testing an alternate path is not possible. What else can I do to fix this connection?

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• Applications getting killed automatically

  - by nebi

  I am running httperf client on my m/c and after few seconds it is getting killed. dmesg shows: The command is: httperf --hog --client=0/1 --server=39.0.0.2 --port=80 --uri=/50kb --rate=20000 --send-buffer=4096 --recv-buffer=16384 --num-conns=6000000 --num-calls=1 Although I had done this test no. of times but never faced this error any time. From last two days I am observing this. My Ubuntu version is ubuntu 10.04. and httperf version is httperf-0.9.0 [ 2997.180620] Out of memory: kill process 7977 (apache2) score 70532 or a child [ 2997.180632] Killed process 7977 (apache2) [ 2997.184837] Out of memory: kill process 7971 (rsyslogd) score 8702 or a child [ 2997.184844] Killed process 7971 (rsyslogd) [ 2997.188823] Out of memory: kill process 7978 (apache2) score 1354 or a child [ 2997.188829] Killed process 7978 (apache2) [ 2997.192817] Out of memory: kill process 7973 (atd) score 561 or a child [ 2997.192822] Killed process 7973 (atd) [ 2997.196805] Out of memory: kill process 8102 (httperf) score 471 or a child [ 2997.196811] Killed process 8102 (httperf) Output of free command: total used free shared buffers cached Mem: 3862768 163000 3699768 0 2384 13068 -/+ buffers/cache: 147548 3715220 Swap: 3905528 0 3905528

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• ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

  - by xyious

  I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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• Cisco ASA 5505 network route for static IP hosts

  - by TheCapn

  I've configured my internal VLAN using the most basic settings where ports 1-7 are assigned from a pool of addresses in the range 192.168.15.5 - 192.168.15.36. These hosts are given access to the internet and it works great. What I'm trying to set up now is allowing users who are connected to the device and specify their IP (say I connect and request 192.168.15.45) are given internet access and can still work alongside DHCP hosts. Those with a DHCP assigned address are blocked from the internet. Mostly the issue resides in that I am very new to working with the device. I feel that the solution is easy but I'm not looking in the right spots and don't have the correct terminology down to google it. Do I need to define access control lists? Group policies? a new VLAN? The rules that are set up seem to be specific to the entire /24 subnet but when I request a static IP outside of the DHCP range I get blocked from other hosts and the internet.

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• How can one restrict network activity to only the VPN on a Mac and prevent unsecured internet activity?

  - by John

  I'm using Mac OS and connect to a VPN to hide my location and IP (I have the 'send all traffic over VPN connection' box checked in teh Network system pref), I wish to remain anonymous and do not wish to reveal my actual IP, hence the VPN. I have a prefpan called pearportVPN that automatically connects me to my VPN when I get online. The problem is, when I connect to the internet using Airport (or other means) I have a few seconds of unsecured internet connection before my Mac logs onto my VPN. Therefore its only a matter of time before I inadvertently expose my real IP address in the few seconds it takes between when I connect to the internet and when I log onto my VPN. Is there any way I can block any traffic to and from my Mac that does not go through my VPN, so that nothing can connect unless I'm logged onto my VPN? I suspect I would need to find a third party app that would block all traffic except through the Server Address, perhaps Intego Virus Barrier X6 or little snitch, but I'm afraid I'm not sure which is right or how to configure them. Any help would be much appreciated. Thanks!

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• Mac | Router not assigning the IP address.

  - by Vaibhav Bajpai

  I recently installed Mac OS X 10.6, however the ethernet state is down. The assigned IP is 169.x.x.x. When booted the live USB of Ubuntu, I properly get an IP assigned in the range 192.168.1.x from the router 192.168.1.1 I am using the same router and same ethernet line. I tried to ping to 192.168.1.1 from my Mac and I get a host down message. I tried to manually assign the IP and set the router IP to 192.168.1.1 but still the router is unreachable.

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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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• How would I isolate one netowrked PC to LAN only?

  - by itsraine

  I would like to have one of my PCs available to the rest of my home network for file sharing and VNC access, but I want to block any Internet traffic going to and from the PC. In other words, I want all local PCs I have connected to the router functioning as any normal LAN would, but when it comes to the Internet I want one particular PC to be "safe" from the Internet. My guess is that this is some sort of port blocking or some other router function, but I'm not quite sure.

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• Suggestions for transitioning to new GW/private network

  - by Quinten

  I am replacing a private T1 link with a new firewall device with an ipsec tunnel for a branch office. I am trying to figure out the right way to transition folks at the new site over to the new connection, so that they default to using the much faster tunnel. Existing network: 192.168.254.0/24, gw 192.168.254.253 (Cisco router plugged in to private t1) Test network I have been using with ipsec tunnel: 192.168.1.0/24, gw 192.168.1.1 (pfsense fw plugged in to public internet), also plugged in to same switch as the old network. There are probably ~20-30 network devices in the existing subnet, about 5 with static IPs. The remote endpoint is already the firewall--I can't set up redundant links to the existing subnet. In other words, as soon as I change the tunnel configuration to point to 192.168.254.0/24, all devices in the existing subnet will stop working because they point to the wrong gateway. I'd like some ability to do this slowly--such that I can move over a few clients and verify the stability of the new link before moving critical services or less tolerant users over. What's the right way to do this? Change the netmask on all of the devices to /16, and update gateway to point to the new device? Could this cause any problems? Also, how should I handle DNS? The pfsense box is not aware of my Active Directory environment. But if I change DNS to use the local servers, it will result in a huge slowdown as DNS queries will still be routed over the private t1. I need some help coming up with a plan that's not too disruptive but will really let me thoroughly test the stability of the IPSEC tunnel before I make the final switch. The AD version is 2008R2, as are the servers. Workstations are mostly Windows XP SP3. I have not configured the 192.168.1.0/24 as a site in AD sites and services.

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• Can a laptop be compromised through WiFi if the machine never connects to a hotspot?

  - by MousePad

  For instance, you're laptop's wifi card is on, but you've deliberately not connected to any hot spots. Is there anyway it can be hacked while sitting there, and not connected?

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• Two NICs, one server.

  - by kobrien

  I have two NICs on a fresh install of Ubuntu 10.04 LTS. Both are config'd be dhcp. Both cards are on the same lan with same gateway. everything about the cards is the same except the IPs they get, which is what I want. What I'm trying to achieve is having both NICs operational at the same time. Currently when the server boots, it activates both NICs, but the server can't resolve any domains. If I ifdown one of them and bring it back up, the server is able to resolve domains, but the NIC I bring up won't respond to any traffic. Any ideas?

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• VMWare Player disrupting Samba on Ubuntu 9.04 host?

  - by TonyUser

  I've had Ubuntu 9.04 running on this computer for a while now. I just installed VMWare Player on my system and now when I try to browse the network in the Ubuntu host all the computers will show up one time only. If I try to browse again, no computers appear and even the workgroup is missing. I have to run: sudo /etc/init.d/vmware stop sudo /etc/init.d/samba restart to get the network visable again. As long as VMWare Player is stopped Samba seems fine. I guess it's got to do with the virtual adaptors that VMWare installs. Is there a way to get them both to work, or did I just miss-configure something?

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• Regarding the functioning of the HTTP server

  - by Luv

  As all of us uses the HTTP protocol for accessing the web, and request at the port number 80 of the server, now suppose i want to browse or download a file then i will request to the HTTP server by specifying the complete URL. If the server is having file, it would return it if it is not having the file then what will it do? I think it will make the request to the appropriate server which would be having this file and get the file and return to us. In this way does the HTTP server acts as an intermediate between the client and the server? Please correct me if i am wrong here. Many many thanx in advance

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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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