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• I need to build a mini computer lab with 6 PCs

  - by chiurox

  Hello everyone, This weekend I need to build a mini computer lab with 5-6 PCs. The purpose is for a small computer class that will be taking place. They're mostly going to be doing office and daily kind of stuff, so nothing high performance. However, I hope it will last at least for 2 more years. I already have some parts for 2 PCs, one is a P4 3.0 and another is Celeron 2.4GHz, both socket 478. For the other 4 PCs, I'm wondering if I should buy individual parts and put it all together or get workstations like those Dell Optiplex with P4s. To put things into perspective, I am not currently in the US. I'm in South America and prices here are ridiculously. Another really important thing is that I need to share an internet connection between a total of 8 PCs at this place. Right now I only have a crappy wireless router, should I get another one? Or go with switch hub? I'm not experienced in this matter. Thanks guys!

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• Two domains accessing same folder

  - by Liam Quinn

  I've just taken a new role in a school and am still familiarizing myself with their network, how ever I have recently been given a task and I'm having a little trouble finding out the fundementals of it. I have an admin network/domain 10.49.x.x and a classroom network/domian 192.168.1.x both connect to a Proxy server 10.49.202.231/192.168.1.51. Each domain has it's own shared folders as you'd expect, files and software installs etc, how ever there is a folder "staff" on the classroom network that all the teachers on the classroom network can access. The users on the admin network would like to access this same folder. How do I go about making this happen?

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• What would cause a single working website to not work on 1 out of 5 devices on a network?

  - by th3dude

  There is a specific website that loads up without problem on all machines on my network (both wired and wireless) except one laptop. This laptop is a Windows 7 machine that was just recovered using the recovery partition, so it is fresh. The site will not load in Firefox 3.6 or IE 8. The website is http://www.weightwacthers.com The site loads fine on my desktop, iPhone, and Droid, but not the laptop. In all my years in this business I've honestly never seen this happen. Also, 'Is it down for me or everyone' reports that it is indeed only me. What would cause this to happen?

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• Can I connect two routers to one switch?

  - by vanneto

  I want to connect two routers to a switch which will then be connected to a modem. Now as far as I know a switch does not do network translation and this won't work with one IP address. So I bought two addresses at my ISP. Attached is a simple schematic that explains what I want to do. Is there any additional configuration needed on either of the routers (Linksys WRT54GL) to make this work or will it "Just Work"?

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• Extend university wifi network

  - by asfasdoiuh ouhouhouh

  i live in a university campus and i can get wifi signal on the outside of my window but not in the house. The solution i use at the moment is a usb wifi dongle outside connected to my laptop but the lack of an internal antenna make the connection quite unreliable at times. So i was trying to find another solution to improve the reception of my network. One idea is to setup a router on the outside (in a place with stronger signal) and redirect the connection inside the house with an ethernet cable but the problem is that our Uni Wifi is managed by a capitve portal (BlueSocket with DNS redirection to login page) and the authentication has to happen on the mac address that connect to the net (so the client appliance in this case). If I use a router with Mac-Clone capability i will be able to be redirected trough the captive portal on my laptop computer and login from there or i need to setup my router to fill in the login page by itself? There are other hardware/software solutions i can use to get what i want?

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• routing problems

  - by user174050

  I have an windows 7 laptop and I have installed openvpn 2.2x as client. The laptop has 2 ethernet cards, one of them is wireless. The wireless lan is 192.168.1.0/24 The Fix lan is 192.168.2.0/24 If I connect to the openvpn server useing the Fix lan the I can connect properly and for testing I ping to my openvpn server 10.0.0.1 that answers correctly. But if I connect to the openvpn server useing the wireless lan, I can establish the connection but pinging to the server isn´t possible. The packets goes allways lost. Why can this happen? In an other laptop where windows xp is installed and with the same lan configuratio everything works propperly. In both cases the firewall is configured to access the vnc server and the server directories useing samba. With the XP I have no problems. I will thank you for all help Ignacio

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• Routing between two networks on linux?

  - by gGololicic

  I got stuck with one problem I cant find solution. I have linux pc with two NIC. first nic (eth1) is connected to public ip (probably switch or whatever, doesnt really mater) so eth1 is connected to wan and another eth0 that I connected to switch and make it a lan nic. configuration: eth1 ip address 88.200.1xx.xxx //xxx's are cuz of security reasons eth0 ip address 192.168.1.1 wan ------ [eth1 (linux PC) eth0]<----[switch]<---- [eth1 (PC1)] Now I want to connect this two networks, so PC1 can access linux PC and wan. I think I know how to do it but I cant confiugre it right. This is what I tried: I turend on ip forwarding (for sure) I set eth1 default gw to the right ip on the wan I tried to set eth0 default gw to the same ip (but i couldnt) What or how can I do this, I was trying with linux route command, but I got stuck. Please help.

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• Only receiving one document at a time from new web server.

  - by Robert Kuykendall

  We're trying to move our internal ticketing system from a Microsoft Small Business Server in the server closet to a Rackspace Cloud Server. The install is Fedora 11 LAMP, and should be default out of the box, except for the vhosts appended to the bottom of the httpd.conf. The new server is suffering from crippling load times, and watching the page load in Firebug it's easy to see the problem occurring, but I can't figure out the cause. Here is the [old server] (http://rkuykendall.com/uploads/old.server.png). I was expecting something like this, but a little slower since it was no longer hosted locally. Instead, the [new server] (http://rkuykendall.com/uploads/new.server.png) appears to only serve one file at a time. Here's another example of this [staircase load time effect] (http://rkuykendall.com/uploads/staircase.png) and another very clear example of the [staircase effect] (http://rkuykendall.com/uploads/staircase2.png). I talked to some guys on Freenode #httpd with no luck. I created a duplicate server to play with, and also created a fresh server with Fedora Core 13 and moved over just the database and web files with no luck. Any suggestions? ( image links disabled due to n00b-spam-restrictions )

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• Random timeout now and then

  - by KenavR

  Maybe this is a to generic question, but since we have this issue for quite a while now, I give it a shot. We have some applications which use HTTP for the connection between the client (website or fat-client) and the server. The Computer who runs this applications is in a Network behind a firewall and a proxy, the server isn't inside the same network. The problem is that every now and then the https Request times out and depending on the Client the Application "hangs" or does some other funky stuff. The problem is definitely inside our network, because if i try the applications outside our network it works fine. Can you give me a hint where i can most likely find the problem?

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• Determining the State of a User using their Hostname

  - by PhpMyCoder

  Not sure if this is the right SE site. I figured this question doesn't belong on SO, but if you think it doesn't belong here either, I apologize. I've been looking into determining the location, specifically the state, of a user accessing my website. One of the options I've known about for a while is the GeoIP City Database, however this isn't the most cost effective solution and I'm cheap so I was looking for a less expensive way. Something that occurred to me was that my state was in the public hostname assigned to me by Comcast: (Dash Separated IP).hsd1.ma.comcast.net Could it be possible that other ISPs follow this same pattern of inserting the state abbreviation into their users' hostnames? I've been looking around for a list of hostnames for other ISPs, but I haven't found anything. Can anyone verify that this holds true for other major ISPs?

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• Losing network connection after VPN disconnects

  - by Tanja Allito

  I use tunnelblick and OpenVPN on the mac, but when I choose to disconnect from the VPN I lose all network connectivity and have to reboot to get back online. Is there a way to get a new IP or something, without having to reboot?

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• Cant get squid proxy to work

  - by danielgratz

  i need squid proxy on my centos server. But i just can't get it to work. I did yum install squid. Here is my squid.conf file (i removed all comments): acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 acl Safe_ports port 80 acl Safe_ports port 21 acl Safe_ports port 443 acl Safe_ports port 70 acl Safe_ports port 210 acl Safe_ports port 1025-65535 acl Safe_ports port 280 acl Safe_ports port 488 acl Safe_ports port 591 acl Safe_ports port 777 acl CONNECT method CONNECT acl our_networks src 192.168.1.0/24 192.168.2.0/24 http_access allow our_networks http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all icp_access allow all http_port 3128 hierarchy_stoplist cgi-bin ? access_log /var/log/squid/access.log squid acl QUERY urlpath_regex cgi-bin \? cache deny QUERY refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl apache rep_header Server ^Apache broken_vary_encoding allow apache coredump_dir /var/spool/squid Then i just put my server's public ip and port 3128 into my web browsers proxy settings... but it isn't working i can't visit any website. Please help. Thanks.

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• Connect USB hard drive to wireless router on RJ45 port? Possible?

  - by lawphotog

  just a quick story behind. I was trying to set up wireless networked hard drive at home. My wireless router doesn't take USB. I am considering few options. First i was considering to get something like WD My Cloud. My router is an old one provided by service provider. It only has 10/100 Ethernet. WD My Cloud has Gigabit interface. So unless i changed a new router, data transfer will be slow. So upgrading the router is a must if i want fast transfer speed. Plus I already own an external hard drive with USB 3.0 interface. So if I get a router like Netgear D6300, i can get a decent speed wireless shared drive at home. And i can use my existing HDD instead of WD My Cloud. But the router isn't cheap so I am saving up for that. In the meantime I found out the existence of USB to RJ45 adaptor. I read the reviews and some say it works for them and for some don't. They didn't really say what they were trying to do so I'm confused. So if i bought an adaptor like this, can i connect my existing HDD (USB) with my existing router (RJ45) and use it as a shared drive for data transfer? I know it will be slow as the adaptor will only have USB 2.0 and 10/100 for Ethernet. But it's fine as it's for temporary until i got my new router.

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• All wireless networks suddenly disappear every once in a while

  - by snakile

  Lately, about every 15-60 minutes, my wireless internet connection disappears. When it does I can't find any other wireless network, though such networks exist. Only after rebooting the system, it goes back to normal and finds wireless networks, but only for a while. 15-60 minutes later it's disconnected again, not finding any wireless network. I'm using Windows 7 on Lenovo Thinkpad X201s. What could it be?

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• 2 Computers, same network, different outgoing speeds when uploading to internet?

  - by user117339

  I have 2 work machines in my office, a PowerMac G5 and a MacBook Air. Both behind an IPCop firewall. The PowerMac is connected through a gigabit switch, the MacBook Air is connected through a Netgear 802.11g access point that is then plugged into the gigabit switch. There is also a FreeNAS box, both machines are able to read and write files to it at close to their pipe speeds. The main problem is when I am trying to upload files to the internet at large. The G5 is only hitting 0.1 - 0.25 Mbps. The Macbook is able to hit 2-3 Mbps. The setup (G5 / IPCop / Network) has been the same for 5 years. The issues with the internet speed started about 3 months ago. I hadn't tested on the Macbook at this point. I had complained to the ISP, they said their modem needed a firmware update, did that nothing changed. Reset IPCop, turned off squid, etc. No changes. The ISP switched the office over to a better plan with a theoretical 6 Mbps up, still no change. At this point I tried testing the Macbook, and lo and behold there's the speed. But why? I have tried changing out everything, cables, switches, using another ethernet port on the G5, wiping the system, using DHCP, using manual IPs, changing DNS servers, etc. Nothing works. I figured that if there was something horribly wrong with the network, then internally I would find a similar issue, but that is perfect. iperf, ping, etc show no dropped packets and near saturation of the internal network. I'm at a loss as to what the heck is going on. Any ideas would be appreciated! Below are some screenshots of speedtest.net: G5: Macbook Air:

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• Access Configuration Page of Modem (in bridge mode) through router

  - by Ujjwal Singh

  Given the Network Configuration: Internet (121.243.x.y/27) | (121.243.x.z) Static : Public Global IP Modem Bridge Mode | WiMAX (192.168.1.1/24) +169.254.1.1/24 : Modem Configuration Page | (192.168.1.2) Router DLink DIR 615 | Ethernet + WiFi (192.168.0.1/24) | Local network (192.168.0.2) Workstation Ethernet | no WiFi Is there any way, maybe using Routing Tables, to access the Modem configuration page at 169.254.1.1 from my local network, using a Windows 7 PC? Note that the modem is currently able to display its configuration page at 169.254.1.1, i.e. even while it is in bridge mode.

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• Taskbar Disappears Over Remote Desktop Connection When Outside Local Network

  - by CMikeB1

  I've got a machine on my home network running Windows Server 2012 (Based on Win8) and rather than attach a monitor I remote desktop in and it works fine on my local network. The problem is, when I try to access it from outside my local network the taskbar disappears completely. When I minimize an application rather than minimize to the taskbar it simply closes the window as small as it can as if the taskbar never existed (see photos at ). I've messed with the connection properties (show/hide desktop background, etc.) with no luck. I've used the following methods to remote in and they all are fine when on the local network and taskbar-less from outside: Remote Desktop Connection on Mac Remote Desktop Connection on Windows Jump Desktop on iOS using RDP To access the computer from outside my local network I'm using a Linksys router and mapping to the server IP, port 3389. See Photos: http://i.stack.imgur.com/FyUeQ.png http://i.stack.imgur.com/9MnVr.png

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• Delete a iptables chain with its all rules

  - by timy

  I have a chain appended with many rules like: > :i_XXXXX_i - [0:0] > -A INPUT -s 282.202.203.83/32 -j i_XXXXX_i > -A INPUT -s 222.202.62.253/32 -j i_XXXXX_i > -A INPUT -s 222.202.60.62/32 -j i_XXXXX_i > -A INPUT -s 224.93.27.235/32 -j i_XXXXX_i > -A OUTPUT -d 282.202.203.83/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.62.253/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.60.62/32 -j i_XXXXX_i > -A OUTPUT -d 224.93.27.235/32 -j i_XXXXX_i when I try to delete this chain with: iptables -X XXXX but got error like (tried iptables -F XXXXX before): iptables: Too many links. Is there a easy way to delete the chain by once command?

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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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• Any recommendations on a NAS for a home-super-user?

  - by marc_s

  Can anyone recommend a good NAS for use in a home-server environment? I would request at least 2, preferably 4 disks, and I am most interested in good to excellent throughput for file-server and backup purposes - don't need any of the fancy media-streaming or -sharing features, that's not of interest to me. For a 4 or more disk solution, support for the various RAID levels (0, 1, 1+0, 5) would be a plus - especially if supported in hardware (rather than just a software emulation). I just need a place to put my collection of data, ISO images, and so forth - and since several external disks (self-built and off-the-shelf) have failed so far, I'm looking into a more reliable solution. Marc

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• Wireless connection to DSL Modem-Router restarts on heavy usage.

  - by ULTRA_POROV

  The title says it all. When I download alot of stuff the wireless connection will close. After 10-20 secs it will reconnect. What could be causing this? What is more likely to be the cause, my wireless adapter or the router?

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• TCP/UDP hole punching from and to the same NAT network

  - by Luc

  I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same network, is that it will send a packet out with the same destination and source address. Only the source and destination port would differ. I imagine a router with NAT loopback enabled will handle this as it should, but how about other routers? Would they drop the packet, or would a router (the first?) from the ISP bounce the packet back after which it gets handled okay? I'm wondering because I was thinking about using this technique to circumvent a block between peers in a network (like a school network where clients can only access the internet, but any contact with each other is blocked). The only other option is to use a man in the middle as proxy (tunnel?). The disadvantage of this is that you have to have a server with significantly more bandwidth than one that would only do hole punching. Also the latency would increase significantly.

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• OpenVPN: Single certificate authority, multiple VPNs

  - by darwish

  The company in which I work has a single site (I'll refer it as "Site A"). There are several private networks within site A. We have a running instance of OpenVPN which allows some employees to connect to one of the private networks in site A. We're planning to extend our facilities to another site (which I'll refer as "Site B") and we wish to connect both sites using OpenVPN. The VPN which will connect sites A to B will be a trunk link, meaning it will have access to all networks. If we use the same certificate authority for both VPN servers, this will allow the employees, which can only to one of the private networks within site A, to connect to the site-to-site link, which will give them access to all networks. Off course this is undesirable. Using 2 different certificate authorities seems like the obvious solution, but it doesn't feel right. I wounder if there's a way to maintain permission control within a single certificate authority.

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• Network Sniffing and Hubs

  - by Chris_K

  This will likely seem naive to the experts... but it has been on my mind lately. For years I've been using ntop and a cheap 4 port hub to sniff client networks to determine who's doing what -- and how much. Great way to see what's going on when they call and say "Geeze, the network seems really slow today." No need to bring in a managed switch (or access the existing one) and no need to configure spanning or mirroring. I just drop in the hub inline where I want to measure. Lately I noticed it is just about impossible to buy a real honest-to-goodness hub anymore. While looking for a new one, I had someone tell me that I should be sure to get a full-duplex hub or I'd only be seeing half the traffic when I monitor. Really? I've been using a crusty old Netgear DS104 all this time. No clue if it is half or FD. Have I really been understating my measurements? I'm just not bright enough about the physical layer to really know... Side note: Just ordered a Dualcomm Ethernet Switch TAP as a hub replacement. Seems like a nifty gadget. Any notes or tips about it would be welcome in the comments :-)

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• syslog log of TCP packet

  - by com

  Occasionally, I noticed a lot of following messsages in syslog Nov {datetime} hostname kernel: [8226528.586232] AIF:PRIV TCP packet: IN=eth0 OUT= MAC={mac} SRC={sourceip} DST={destinationip} LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=20361 DF PROTO=TCP SPT=39950 DPT=37 WINDOW=14600 RES=0x00 SYN URGP=0 On the Internet, I found that DOS attack may cause such type of output, unfortunately, I don't understand what does this log mean. The only thing is clear for me is this log is related to network. The source host is the host where nagios is installed. Does it mean nagios somehow does behave well? And what does it mean at all?

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