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• Tunneling over IPv4 network

  - by JoesyXHN

  Hi, Most of the articles I have read about Tunneling. It describes that the tunneling supports for communication between 2 IPv6 networks over (crossing) an Ipv4 network. For example: TUNNEL A (IPv6) ==> INTERNET NETWORK (IPv4) => TUNNEL B (IPv6) Would it be doable for: TUNNEL A (IPv4) ==> INTERNET NETWORK (IPv6) => TUNNEL B (IPv4) Please give me an answer with elaborate explanation. Thanks in advance.

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• when connected to vpn, can't access certain things

  - by shsteimer

  my companies vpn is not a standard windows vpn. It uses Juniper Networks and it intalls locally something called "Host Checker" prior to allowing me to connect. I have noticed 2 things that I can't access while on vpn. etrade.com - no idea why this specific website, but I can't get to it, maybe https? use of my magik jack - I'm assuming this is some sort of a port conflict issue. if im on a call when i connect, i lose all reception. if i try to make a call after conected, ic an't even get it to dial. Can anyone tell me how I would even begin to debug this. I expect if I call the help desk they won't be much help, but if I can tell them the specific problems of conflicts, maybe I have a chance of them working with me to get it working.

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• Establish connection with an IP camera behind a modem-router assigned with a private IP by Internet Service Provider?

  - by silvernightstar

  Most solutions out there require the modem-router to have been assigned a public IP by the ISP. After which, one can access the IP camera via a portforward setting on the router. However, my ISP only provides private IPs internal to their system (they probably have a limited pool of public IPs). So I am unable to view my IP cameras in the way described. I'm wondering if there's a way to work around this problem without having to need a public IP. Since, after all, two users on Yahoo Messenger or Facebook Chat are able to find one another and exchange data despite both sides being within the internal networks of their respective ISPs. Given that I only plan to view my IP cameras via iOS or Android running on a smartphone or tablet, any ready-to-use solutions out there?

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• How to choose an open source, Asterisk friendly firewall?

  - by Lucas

  I'm in pain. We are moving to a SIP based VOIP system and for whatever reason, we could not get our hosted Asterisk solution to work with our Sonicwall. Our VOIP provider gave up and is recommending an open source vendor, pfSense. A little background: We have about 30 users in our network. We use a few IPSec VPN connections for remote networks. I would like, but don't need, application layer filtering. We're active internet users, so properly traffic shaping is probably a concern. How can I tell if an open source firewall will handle VOIP setup smoothly with a hosted Asterisk system?

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• What virtualization solution should I try next, after hitting problems w/ VMWare Player in dual-netw

  - by Alex R

  I have been using VMWare Player 2.5 for a while (Ubuntu guest on Vista host, 32-bit). VMWare had worked great until now but then I hit a brick wall: Due to some reorganization of my home network, the host machine now has to use a wireless connection to reach the Internet, while the printer, fileserver, and other important stuff are attached to a local gigabit hub. I have tried several tricks, such as editing the .vmx file, changing settings in vmnetcfg, etc, but I'm still unable to get the virtual Ubuntu box to connect each of the two virtual NICs to different networks (I did get it to recognize two NICs, but both DHCP'd onto the gigabit LAN). So, I'm ready to dump vmware for something with a little more low-level control of network settings. Virtualization is such a crowded space, I could spend months evaluating every product out there. I'm hoping for a shortcut... Can anyone recommend the best VM for my situation described above? Thanks

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• Network Role based routing

  - by Steve Butler

  Apologies my networking skills are a tad rusty. I'm looking for a way to setup a system that gives me the ability to setup Role-based access to specific network resources. For example, i have three private subnets for specific groups, users will need access to one one or more subnets. I'd like to have all client machines on the same subnet/vlan, and then use 802.1x to authorize into a router(NAC device/whatever), the router would then see what user had authenticated(huge plus if it could determine AD group), and then allow routing to one or more of the three private subnets based upon their group membership. I've looked at packetFence, and it appears to work by assigning a client to a VLAN, but i'd still need a way to route some users into different back-end networks.

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• Wireless only connects to Google

  - by dmanxiii

  I am using a netgear wireless router to connect to create a wireless network. When connected to the router via an Ethernet cable everything works correctly. When connecting to the router via wireless only Google can be accessed. I've done searches via Google using random words to make sure that it is not a cached page, and these all work. However, trying to connect to any non Google domain the page fails to load. I've accessed the connection with two different laptops, both are running Windows Vista. The network connection is strong on both, but the issue persists for both. Edit: I have configured the wireless networks name and password, and connect to that using the credentials I have defined. I am sure I am not connecting to a neighbors wireless network. Edit2: Typing in the direct IP address for CNN.com ( http://157.166.255.19 ) would not resolve.

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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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• Is there any way to prevent a Mac from creating dot underscore files?

  - by SoaperGEM

  At work we're letting one of our very tech savvy clients actually help out a little with a few development projects specific to him. However, he uses his own personal Macbook, and as he edits files on our (Windows) networks, his Macbook always creates a bunch of unnecessary meta files that we end up deleting later. For instance, it creates a file called .DS_Store in any directory he opens, as well as "dot underscore" files for each file he edits. So for instance, if he's editing a file called "Main.php", his Macbook will create another file called "._Main.php". I know there are ways to prevent creation of .DS_Store files, but none about how to prevent creation of these hidden files prefixed with dot underscore. Is there any way to turn that off on Macs? Any way to prevent it from creating those files in the first place?

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• duplicate video stream using a router (?)

  - by Dani

  I have a viedo stream coming from one site, I want to do the following with the minimum delay possible: I want to duplicate the stream (inside the router - preferred) and send it to a few more locations one of them is local network and the rest - on other networks. I want to be able to do it to several streams simultaneously. Is it possible to do this - using network devices only ? What device is capable to do this ? (I can always record the stream and rebroadcast it - but that's a lot of delay, I'm looking for functionality that similar to port duplicating, but on higher layers). Thanks.

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• How Do I Enable CUPS Browsing Across A Network?

  - by David Mackintosh

  I have a CUPS server with two print queues defined. Once this was defined, all the CUPS clients on the same subnet could see the two print queues automatically, no problem. Now I have a collection of machines on a separate subnet, reachable from the first subnet by a router. How do I enable CUPS browsing on the second set of machines so that they can see the print queues defined on the first machine? Let's call the server A.B.C.7. The first subnet is A.B.C.0/24. The second subnet is A.B.D.0/24, and there is a router with arms on both networks.

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• Cross-platform automatic adhoc wifi?

  - by marienbad

  I'm not very knowledgeable about wifi, but I understand the notion of Adhoc networks (Wifi without a router), so... Is there a standard (or widely implemented) way of letting a device "momentarily" negotiate a wifi connection (Adhoc network or otherwise) directly to another device, transfer some data, and then quit, all without any user intervention on either device? For example, let's say I have a PC and an ereader in the same room and there's no nearby wifi router for either of these devices to connect to. I want to send a file from PC to ereader but I don't want to do the work of setting up network, selecting an SSID, or entering passwords. Is that possible?

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• Why does the Internet WI-FI connection of my laptop disconnect when I connect the ethernet cable to the LAN?

  - by Joey Hammer

  Why does the Internet WI-FI connection of my laptop disconnect when I connect the ethernet cable to the LAN? These are two separate networks, the LAN is without Internet, I just use it to connect the tablet to the laptop and smart phone in my home network. The WI-FI is owned by the landlady and connects to the Internet. I know it should be possible to be connected both to the Internet through WI-FI and to my other computers and gadgets through the LAN because sometimes it works, but sometimes when I connect the ethernet cable the WI-FI disconnects and I wonder why? Pongy OS: Windows 7

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• Windows Server 2008 R2 - Can't connect RDP over the Internet

  - by Jonathan DeMarks

  I have two networks: Domain and Public, Domain is a VPN connection and Public is the local connection to the network. This is not a domain controller or a DNS/DHCP server. I can connect via RDP from the local network (192.168.1.), from the VPN network (10.1.2.), and from the VPN network over the internet. I cannot connect from the internet (anywhere besides where the server is VPN'd) Wireshark indicates that the server is getting packets, and the audit log is indicating that the packets are being dropped. Advanced Firewall has explicit options to allow RDP, and has no deny policies. I have also tried turning Firewall off completely to no avail. I'm really lost on this one.

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• Linux: set up media server to stream video via the Internet?

  - by Hassan

  How do I set up a media server in Linux which streams video over the internet? Is it easy to do this? I want a server that will actually encode video in real time to allow it to stream over sometimes slow or unreliable networks. Basically, I want a server that works on the internet. I have a directory with a bunch of video files, and want to make this accessible to myself remotely. For other situations, I found great and useful software (such as the PS3 media server). I'd like to find something equally as useful for streaming video over the internet.

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• Can't connect to Internet through WiFi, but can with cable

  - by aldy505

  I'm using Windows 7 32-bit, Toshiba Portege laptop. I want to connect to the WiFi, usually I can do that easily. But, I don't know.. maybe when I tried to install a Microsoft Research: Mesh Virtual WiFi that could connect more than 2 wireless networks. I wanna try in connecting both Wireless router and my personal Ad-Hoc. Now, my laptop don't recognize my WiFi, well, I can connect to the WiFi but it says: "Limited access" and doesn't really connect to the internet. But when I plug the LAN cable, it works. I know the problem is in the laptop's wireless connection or in the properties. Any help for this? UPDATE: The IP and DNS settings, I set to automatic, and when I ran diagnostic, Windows tells me that the wireless network adapter is the problem, but they told me to insert the LAN cable, so how to fix the wireless? They didn't tell me how to fix that.

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• Generating and collaborating on network map diagrams?

  - by Ian C.

  I have to turn out some network topology maps for very large networks. I'd like the format for the maps to be something other people can also edit and contribute to regardless of what software I'm using on my Mac to build them. I don't mind spending money on my end for software, but I can't require that my clients spend any money. I also can't promise my clients are also using OS X -- they could be running Linux or Windows. Is there a best software application on OS X for producing maps that I can share with other, non-OS X, users? Is there a best format for sharing topology maps that I should use when exporting the maps to disk?

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• Automatically Connecting to Hidden SSID WiFi Network

  - by Zack

  My MacBook Pro will not automatically connect to a Wireless network with a hidden SSID. It makes me select the "Join Other Network..." in the Airport menu (in the system tray), where I need to input the name of the network, then security type, password and wait for it to connect. This is becoming increasingly annoying to have to do every time I come back to my desk. I'm running Mac OS X 10.5 and there doesn't seem to be an option to connect to a specific network, but rather "Preferred Networks." The only network I have set as Preferred that's in range is my home network, and it still doesn't automatically connect. Making the network publicly visible isn't under my control, so I'm stuck with what's currently in place. Reader's Digest version: How do I make my MacBook Pro automatically connect to a WiFi Network with a hidden SSID without having to "configure" it every time I want to connect?

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• Dealing with SMTP invalid command attack

  - by mark

  One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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• Wireless performance on Ubuntu 9.10

  - by Brian

  Is there something I should do to my networking configuration in Ubuntu to better the performance of my wireless connection? I'm on a netbook dual-booting Windows 7 and Ubuntu 9.10. I pick up much stronger wifi signal when in Windows than Ubuntu. As soon as I boot Ubuntu, it will connect to the network with a stronger signal, and then loses signal very quickly. After it dies, I can't reconnect. I've tested this on a couple of different networks with the same outcome.

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• Where are Wireless Profiles stored in Ubuntu

  - by LonnieBest

  Where does Ubuntu store profiles that allow it to remember the credentials to private wireless networks that it has previously authenticate to and used? I just replaced my Uncle's hard drive with a new one and installed Ubuntu 10.04 on it (he had Ubuntu 9.10 on his old hard drive. He is at my house right now, and I want him to be able to access his private wireless network when he gets home. Usually, when I upgrade Ubuntu, I have his /home directory on another partition, so his wireless profile to his own network persists. However, right now, I'm trying to figure out which .folder I need to copy from his /home/user folder on the old hard drive, to the new hard drive, so that he will be able to have wireless Internet when he gets home. Does anyone know with certainty, exactly which folder I need to copy to the new hard drive to achieve this?

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• Database for heat tolerances of various cables?

  - by I. F.

  Is there any kind of unified database of heat tolerances for networking cables? I've been setting up a number of home/small office networks lately and as a mostly-amateur I could really use some information on what is safe to run behind a radiator, next to a steam pipe, etc. The question I'm up against at the moment is: Can I run normal RJ11 phone line cable (from DSL modem to phone jack) behind a steam radiator without risking a fire? Unlike cat5, I could not find published standards for these, so I'm turning to experts with more experience. This is a cut-rate show. Do I go out and buy more cabling, and if so which, or use the spare that I have?

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• What can I do to configure my SSH such that it pauses for a flaky connection?

  - by kfmfe04

  I run ssh from OSX to a Ubuntu box - under home WIFI, everything works perfectly. However, when I ssh from certain external networks, ssh may be working fine for a minute or two and then drop due to a flaky network (diagnosed by pinging 8.8.8.8). How can I set up ssh so that it simply waits/pauses rather than drop (when dropping, I have to setup my development environment from scratch - a big hassle). EDIT When I say a bad connection, I mean, for example, ping 8.8.8.8 will work fine for a while, and then fail for 40-50 pings, and then come back on again.

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• force connection using USB adapter

  - by James

  Hi all I am new to Linux, so even though this is probably a simple problem it remains unsolved after more then 3 hours of googling :-( I run running ubuntu 10.04 LTS on an Acer Aspire 5520G . the laptop has a wireless adapter, but since I wanted better range I got an Edimax EW-7711USN USB adapter. now , when running ifconfig I am able to see both adapters where as the laptop native adapter is listed as wlan0 and the usb adapter is listed as wlan1. but listing available networks from the wireless network applet , all the connection are listed under wlan0 , the usb adapter is costencly listed as disconnected. this is what I have been trying to do so far 1) ifconfig wlan0 down - I got disconnected from the net but still was not able to get the usb to connect 2) used the wireless connection dialog to connect to a hidden network with the usb adapter - I was able to connect to the network but with no Internet access 3) disable wireless using the laptop function button - both wireless adapters where disabled can anyone suggest a way to connect to to the wireless network using the USB adapter rather then the built in one ? Thanks

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• How to configure postfix to dynamically choose different relayhosts?

  - by user24315

  I use my laptop at work on wireless and wired networks, at home on a wireless network, and at various other places (such as conferences, friends houses, etc). When at work I'd like postfix to use the corportate mail server to route emails. When at home I'd like it to use my personal mail server to route emails. When elsewhere I'd like to have the laptop attempt to deliver email in the normal smtp fashion. Is this possible using just postfix? Do I need something else (such as Lamson http://lamsonproject.org/, or scripts that dynamically patch my postfix configuration) when I want to do routing that depends on my current location?

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