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• Setting up Multiple Routers (as Hardware Firewalls) behind a Home Router

  - by Synetech

  I’ve currently got one computer behind a router with built-in firewall functionality, connected to a home cable-modem that has a single Ethernet port and one IP. I’m going to have to set up another computer for the rest of the family to use which of course will need to be connected to the Internet, probably wirelessly since the modem is in my room and the new system would not be. What I would like to do is to get two more small routers with firewall capability and connect each computer to a router, which would in turn connect to the main router which connects to the cable-modem. That way, both systems have a hardware firewall protecting them (particularly the wireless system) and the burden of blocking would be reduced on both the computer CPUs and the main router because the secondary routers would handle some of the workload. I’m trying to find out about the complexities inherent in this design and how I could set it up to work, specifically the IP handling and NAT aspect. Thanks a lot.

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• Corrupted file, hard drive test?

  - by all-R

  Hi guys, I'm currently on a macbook with a 1TB external hard drive connected trough a USB hub wich is connected on my macbook. The problem is, my disk, wich is partitioned in 2 (one HFS+ and one NTFS) keeps getting corrupted, recently it was my HFS+ partition, I could not repair it using the Apple's Disk utility, but was able to backup my files. Is it synonym that my hard drive is failing? Is it because of my USB hub? I also keep all my iTunes library on my external HD (HFS+ partition), and did a lot of transfer lately, adding files, removing etc. the last time, my partition got corrupted after a lot of deleted items. If anybody has an idea of what to check first, what could cause the problem, I would appreciate it :) Thanks!

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• Cannot connect to internet with Clearwire modem.

  - by ide

  I'm currently using a Motorola WiMAX modem (CPEi 25725) and cannot connect to the internet. I can connect to the modem at 192.168.15.1 and check its status. It says that it has good/excellent connectivity to the internet and shows all five signal bars. Additionally it has sent and received some WiMAX packets so I believe it is connected to a tower. I'm at a loss for what the problem is. Unplugging the modem, restarting it from software, and restarting my computer (Windows 7) have not helped. Windows still reports that it is not connected to the internet. Alternatively, could this be an ISP issue? I have heard that Clearwire is a not-so-reputable ISP that blocks VoIP, and I was using Skype recently.

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• Setting up WiFi extenders... is it possible to daisy-chain them?

  - by Bigbio2002

  At a location with limited cabling, I've had to set up WiFi signal extenders to cover the whole area. Here is a crude diagram... Internet - WiFi/Gateway - Extender 1 - Extender 2 | | PC (ethernet) WiFi device I was able to successfully daisy-chain three together, and I can access the internet from WiFi devices connected to the farthest extender. Is this a supported configuration? If not, what kind of issues can arise from it? The reason why I ask is that the PC keeps reporting IP address conflicts, and I'm wondering if that's caused because of the way this is configured. Additionally, I noticed that the extenders named their own SSID similar to the one they are connected to, but with a suffix. Would there be any issue in naming them all with the same SSID, to enable seamless roaming as you would with multiple standalone APs?

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• Be your own cloud [closed]

  - by Jedi

  I have reasonably many electronic gadgets that can go LAN or WI-FI. But how do you share and/or syncronize all your files among them? Well, between my laptops and my desktop I use Dropbox. A nice way to share files among computers. But what if your HDD on your laptop is not large enough to carry music, pictures and films. Normally you would buy an extern USB HDD and store them there, but then you cannot reach the files from other computers which are not connected to the USB device. Many would say I should use a solution like a cloud with a disc station or something like that. But my needs are follows: A mass storage which can be reached among devices (laptops, desktops, iPhone, Android phone, XBox or Playstation). Has low power requirements and is silent. Can be reached inside home and it would be nice if it could be reached outside home as well. Cheap I have looked around and I have found an wireless router which can share a USB device: D-Link Wireless N HD Media Router. I thought it would be an interesting solution for a simple local cloud solution. D-Link uses a little program called SharePort Plus which mount the USB device to your computer. Unfortunately is the transfer rate to the USB storage device rather disappointing. The transfer rate was 5.8 Mbps even though the distance between the laptop and the router was 2 meter. The same is happening when I use cable from the computer to the router. Another thing is that SharePort Plus only allows one computer be connected to the device at a time. The last thing was something I could live with. I have search on the Internet for other solutions and found this video from Synology. I'm not sure if their solution is the right one. I think a disc station connected to my home LAN could the right solution. What have you done in your home to store and share files among your computers and game consoles?

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• Distributed website server redundancy

  - by Keith Lion

  Assume a website infrastructure is very complicated and is fully distributed (probably like most large web companies). Am I right in thinking that although there are all these extra web servers to handle multiple client requests, there is still a single "machine" whereby users must enter? I am guessing this machine will be the one physically associated to the IP address? I ask because I need to know whether, in places where distributed systems exist, there is still a single point of failure- usually the control node or, in this example, the machine connected to the public internet? Surely there cannot be two machines connected to the internet, as they would have to have different IP addresses? This "machine" may not be a server per se, but maybe it is a piece of cisco equipment. I just need to know whether, in the real world, these distributed systems still have a particular section where they depend on the integrity of one electronic device?

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• Why does pinging a local router return "Destination Host Unreachable"?

  - by Matt H

  I have two tomato routers. One is bridged wirelessly with the other. I have a new server on the network. It's running Ubuntu Server 11.04. They are all connected like this: A - Linux PC B - New Server C - Mac Mini D - Macbook T1 - Tomato 1 T2 - Tomato 2 They are connected like so: A -----+-T1 ==== wireless bridge ==== T2----- ADSL modem | | C & D Connected wirelessly to T2 B -----+ A, C & D do not experience any issues. I have an active SSH session to B from A and it's not experiencing any loss. B, the new server occasionally cannot ping T2 and therefore cannot connect to the internet. However, A can always contact B and B can ping A and B When the network is lost, B can still ping T1, but not T2 yet at the same as B has lost connection to T2, A can still ping T2. Any ideas on what this could be? there is nothing that gives any clues in any of the logs on either router or the linux server. One thing that is interesting is that I set up a ping running between B and T2. T2 has the IP address 192.68.1.1 Here is what I am seeing: From 192.168.1.1 icmp_seq=26 Destination Host Unreachable From 192.168.1.1 icmp_seq=27 Destination Host Unreachable From 192.168.1.1 icmp_seq=28 Destination Host Unreachable From 192.168.1.1 icmp_seq=29 Destination Host Unreachable From 192.168.1.1 icmp_seq=30 Destination Host Unreachable From 192.168.1.1 icmp_seq=31 Destination Host Unreachable From 192.168.1.1 icmp_seq=33 Destination Host Unreachable From 192.168.1.1 icmp_seq=34 Destination Host Unreachable From 192.168.1.1 icmp_seq=35 Destination Host Unreachable 64 bytes from 192.168.1.1: icmp_req=36 ttl=63 time=3.40 ms 64 bytes from 192.168.1.1: icmp_req=37 ttl=63 time=5.70 ms 64 bytes from 192.168.1.1: icmp_req=38 ttl=63 time=2.25 ms 64 bytes from 192.168.1.1: icmp_req=39 ttl=63 time=2.18 ms 64 bytes from 192.168.1.1: icmp_req=40 ttl=63 time=3.12 ms 64 bytes from 192.168.1.1: icmp_req=41 ttl=63 time=2.15 ms 64 bytes from 192.168.1.1: icmp_req=42 ttl=63 time=1.97 ms 64 bytes from 192.168.1.1: icmp_req=43 ttl=63 time= And it cycles to being reachable and not. So I guess you could say the question is, why is the router responding that it cannot be reached?

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• Windows Server 2003: Router, DHCP, Loses internet connection

  - by jM2.me

  I have following setup: a windows server 2003 dedicated server with tho nics. One is connected to internet (no modem/router), and second one is connected to private network. Server has DHCP server installed on it and internet nic is being shared for internet access. The problem is sometimes server loses connection to the internet, so same happens to private network. So far I can manually fix it by releasing and renewing IP address. What could be the cause of this problem? DHCP lease from ISP? Thanks

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• Boxee on Dell 32in TV causes headaches, how to troubleshoot?

  - by brown145

  I have revamped an old pc, installing 4GB ram and a 256MB video card so that I could run Boxee to a Dell W3200 series TV that came with my apartment. It is connected via VGA, resolution is 1360x768, 24bit color, 60Htz refresh rate. Unfortunately, every time I use it I end up with a headache after less that 30 min. I have had my eyes check recently, and am able to play xbox (connected via hdmi) on the same TV without problems. What are the potential causes? My system seems to well meet or exceed the min requirements for boxee, XP, AMD Atholon 64 X2 Dual Core, 4GB RAM. Could it be the VGA cable? What is the most cost effective way to trouble shoot?

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• Port Forwarding Using iptables on Ubuntu

  - by user141610

  This is the scenario. I have configured a web-server in MUX. Now I want to access that web-server from Internet. Ubuntu box has two interfaces, One is connected to WAN (Public IP) and another one is connected to MUX (Private IP). MUX has no option to insert default gateway. iptables -t nat -A PREROUTING -p tcp -i eth0 -d 103.x.x.x --dport 8001 -j DNAT --to-destination 192.168.1.2:8080 iptables -A FORWARD -p tcp -d 192.168.1.2 --dport 8080 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT It does not work. Thanks...

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• TS connection lost but not local

  - by Owl

  I have an office that is connected to a shared db server and terminal services server, that other offices use as well, through a vpn tunnel. For some reason all workstations in the office will lose connectivity to the remote address but will remain connected to their local internet. I have checked both firewalls to ensure all settings match accordingly. They seem to go down at routine times every day and it doesn't last longer than a minute or two. Any ideas of what this may be? OS: Windows Server 2003R2 Terminal Services 5.2 Symantec Gateway 320 & Symantec Firewall/VPN 100

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• A can ping B, B can ping C but A cant ping C. How do i connect A to C (ethernet)?

  - by user16654

  I have a computer at home with ip 192.168.221.xxx I have another computer at work that I can ping and it has 2 ip addresses: 192.168.1.xxx and 192.168.0.xxx. Those last 2 addresses have the same gateway ie 192.168.1.1 . The computer at work is connected to a hub. That hub also has an embedded device connected to it with address 192.168.0.xxx Now from my home computer I cannot ping this embedded device. How would I connect to it without changing the subnetwork it connects to? I can ping the embedded device from my work computer and I can ping the work computer from my home computer. So I am trying to connect to the embedded device from my home computer through my work computer. Port forwarding? how would I establish that on Ubuntu?

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• Two DHCP Servers, Block Clients for one of them?

  - by Rilindo

  I am building out a kickstart network that resides on a different VLAN uses its own DHCP server. For some reason, my kickstart clients kept getting assign IPs from my primary DHCP server. The way I have it set up is that I have a primary DHCP server on this router here: 192.168.15.1 Connected to that DHCP server is a switch with the IP of 192.168.15.2. My kickstart (Scientific Linux) server is connected to that switch on two ports: Port 2 - where the kickstart server communicates to the rest of the production network via eth0. The IP assigned to the server on that interface is 192.168.15.100 (on eth0). The details are: Interface: eth0 IP: 192.168.15.100 Netmask: 255.255.255.0 Gateway: 192.168.15.1 Port 7 - has it's own VLAN ID (along with port 8). The kickstart server is connected to that port with the IP of 172.16.15.100 (on eth1). Again, the details are: Interface: eth1 IP: 172.16.15.100 Netmask: 255.255.255.0 Gateway: none The kickstart server runs its own DHCP server and assigns them over the eth1. Most of the kick starts are built over the kickstart VLAN through port 8. To prevent the kickstart DHCP server from assigning addresses over the production network, I have the route setup like so: route add -host 255.255.255.255 dev eth1 At this point, the clients kept getting assign IPs from the 192.168.15.1 DHCP server. I need to figure out a way to block client requests from reaching that DHCP. Its should be noted that but I also build KVM hosts on the kickstart server as well, so I need those KVMs to have the ability to get DHCP requests from the 192.168.15.1 DHCP server via the bridge network once I finish resolved this particular problem. (Currently, they communicate via NAT). So what would be done to resolve this? Through iptables or some sort of routing I need to put in? I tried to limited to requests via IPtables on that interface, allowing DHCP requests for 172.16.15.x network: -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 67 -j ACCEPT And rejects assignments on eth1 from 192.168.15.x network: -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 67 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 67 -j REJECT Nope. :(

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• How to get monitor resolution of 1680x1050 using ATI Radeon HD 2600 PRO in a dual monitor setup

  - by user7651

  I have Sapphire ATI Radeon HD 2600 PRO graphics card in my Windows Server 2008 x64 machine. It has two outputs a VGA and a DVI. I have connected the DVI to my Dell 24" monitor with 1900x1200 resolution and it works 100%. The VGA I have connected to my second monitor a Samsung 22" with native resolution of 1680x1050. But the ATI driver and Catalyst control centre doesn't show this resolution as an option. If I choose a lower resolution like 1280x1024 it looks really bad and fuzzy. I searched in google and downloaded the powerstrip tool that allowed me to create a custom resolution of 1680x1050 and then this option shows up in Catalyst control centre and my 2nd monitor works fine now. But I don't want to pay for an application to choose a display resolution. Why doesn't ATI show me that option by default even though it has no problem in actually supporting the display at resolution. Is there a way to get 1680x1050 resolution using ATI drivers only ?

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• VM clients can not access WAN

  - by Saariko

  I have a new VM host on my network, on a Dell R620. The dedicated iDrac is connected with static IP of: 192.168.3.x NIC #1 is connected to my router The eSXI 5.1 host is with IP of 192.168.3.250 The vSphere appliance has a static IP of 192.168.3.241 All the clients on the new host are in the same network 192.168.3.x All clients are Windows 2008 R2 My problem is that non of the clients can access the WAN. I can't ping anything which is beyond my router. I CAN ping anything within my router, even if it's on a different subnet - 192.168.0.x (Router rules are in tact and working) I can ping the gateway (192.168.3.254) One thing that I checked, and is bothering my (but don't know if it has any relevance) is that on the Host Networking properties, there is a vmnic0 (picture) that shows as if it only recognizes 192.168.0.x network - is that so? The command: route print shows me the following details, where I have a duplicate entry for 0.0.0.0 (and one is wrong) - which is probably also why it's not working

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• How to show what proxies/firewalls are enabled on Windows XP?

  - by Stephen Melrose

  Hi, I'm trying to fix a Windows XP PC that is having a strange problem. The computer can't seem to connect to the internet, even though an internet connection is present. The router and internet is working fine as I've connected a laptop to it via LAN and wireless and both worked fine. The PC in question is connected to the router as it has an IP from the DHCP. The problem is I can't connect to nor ping any internet address from the PC. I can't even connect to the router admin itself. I've tried both LAN ports in the PC, same problem and both. I'm assuming there's a proxy or firewall on the PC stopping the connections, I just don't know how to find them or see which one is causing the issue. So my question is how do I on Windows XP display the system proxy settings and/or any firewalls that are running? Cheers.

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• refresh windows network performance counters in command line

  - by michalv82

  I am testing a USB device connected to a windows PC. When the device is connected then windows has another network interface going through the device. I need to get the bytes transffered for that specific interface, basically I need the data shown in the networking tab in the task manager for my interface adapter. I found this question which helped to get this info: ms windows network activity bytes send and receive in command line However I have a problem when I run multiple tests - each time I disconnect and connect the device there's another line for the interface, like below. In the task manager networking tab I only see one record for my interface but I don't know how I can know from command line which is the lastest and current instance (it's not like the first line or last line is always the current interface, I noticed it's not consistent): wmic path Win32_PerfRawData_Tcpip_NetworkInterface Get Name,PacketsReceivedPerSec,PacketsSentPerSec,BytesReceivedPersec,BytesSentPersec BytesReceivedPersec BytesSentPersec Name PacketsReceivedPersec PacketsSentPersec 422666370 6317989292 Intel[R] 82579LM Gigabit Network Connection 2715169 8109643 49150 375973 My USB Device 432 568 0 0 My USB Device _2 0 0 0 0 My USB Device _3 0 0 0 0 My USB Device _6 0 0 0 0 Local Area Connection* 9 0 0

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• NAT for static private addresses

  - by biggdman

  Could someone please help me out with the following scenario: I have a machine that hosts 3 lxc containers, and acts like a router for them. The LXC containers have private ip addresses set on the interfaces that are connected to the host. I want to provide Internet access to the containers and I want to configure the host system so it translates only the addresses that are configured static on the lxc containers interfaces. Should I try to configure the host so it translates each of the 3 private addresses to the public address of the host's interface that is connected to the Internet?

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• is it possible in this case to get two IPv6 networks to communicate over the IPv4 Internet?

  - by user239167

  I have a setup of a laptop connected to a cellular IPv4 network (3G usb dongle) and PC connected to another IPv4/IPv6 network. Both have been configured to run as IPv6 routers and each has its IPv6 network. The laptop connects to the Internet via the 3G network with IPv4 address (private one and it is mostly changing) on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:444::/64). The PC connects to the Internet via the organization network with both public IPv4 and IPv6 addresses on one interface and has the other interface on AP mode providing its own private IPv6 network (2001:db8:222::/64). Both running Linux Ubuntu. Is it possible to get the two IPv6 network (2001:db8:222::/64 and 2001:db8:444::/64) to communicate over the IPv4 Internet? Is openvpn of any good in this case to get IPv6 traffic over IPv4-IPv4 tunnel? Thanks for helping in advance

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• Why are the external IP of my router not the same as the external IP of my computer

  - by Martin

  I have a standard network setup where all my network devices, both WIFI and ethernet, are connected to the same router. Lately, however, I've been experiencing some very strange behavior. It started as a simple connecting error, when I tried to reach an FTP server using the external IP. Of course I went right into one of those CheckMyIP sites, to double check the IP and it turned out to be correct. Then I went into my router setup, which is through a tool called aiport-tool, because I have an Apple Aiport Extreme router. Turns out the router displays a different external IP, and for some reason that external IP works when I try to access the FTP server. Can anyone explain what is going on? Why are the devices connected to the router displaying an incorrect external IP? BTW i have no VPN/proxy setups on any of my devices.

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• Hopping a VPN Tunnel

  - by lellouch

  My central office and remote offices are connected to each other over site to site ipsec vpn. We use Fortigate firewalls and everything is working fine. On the other hand, only central office is also connected to another company's network over ipsec vpn as well. In this situation, everything is also fine and employees at the central office is able to reach the other company's resources without problem. Now i want the employees working on our remote office can reach the other company's network over central office without creating new vpn tunnels. http://imgur.com/ozrXfGv How can i do that? Thanks for your answers in advance.

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• How to clear the REPLACEBATT state from APC UPS after hot-swapping the battery

  - by Hubert Kario

  I replaced a battery in APC SmartUPS by hot-swapping. While the swap was all right and didn't disturb connected computers, the "Battery failed" LED on the front face kept glowing. I tried to use apctest from apcups package. Turned off the daemon and run self test (first changing BATTDATE in EEPROM). The test run fine but didn't clear the REPLACEBATT status or the glowing LED. How to clear the failed battery state without powering the UPS and connected equipment down?

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• Frequent connection drops when playing online games (StarCraft 2, Battlefield 3) and behind NAT - how to diagnose? [migrated]

  - by Moshev

  I am having some trouble with (I suspect) my wireless router. It's connected to the internet with a regular lan cable and has a static, public IP address. Our two home PCs connect to the router with regular lan cables, plus there's a laptop which connects over wifi. diagram: Internet | | <- isp-supplied cat5 ethernet cable | D-Link D300 ...wifi... laptop / \ / <- cable -> \ PC1 PC2 The PCs and laptop are behind NAT and share the router's public IP. The router is a D-Link D300. PC1 is used for online gaming and I'm experiencing frequent "connection dropped" errors when playing Battlefield 3, StarCraft 2 and the Diablo 3 beta; but not with TeamFortress 2 or the Tribes Ascend beta. The issue goes away when I remove the router and connect PC1 directly to the ISP's cable. I have also tried disconnecting PC2 and the laptop, leaving PC1 as the only machine connected to the router - doesn't help. How can I diagnose what precisely the issue is?

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• How can a Virtualbox host connect to a guest VM when host wireless is disabled / host Ethernet cable is unplugged?

  - by uloBasEI

  I have a Virtualbox VM running on a computer connected to Internet via an Ethernet cable. The guest has a network adapter attached to a NAT. 2 ports (22 and 80) are forwarded so that the host can access them respectively on localhost:2222 and localhost:8080. When the Ethernet cable is plugged, both machine (host and guest) can access Internet and the host can access the SSH server/Webserver which ports are forwarded. When I unplug the Ethernet cable from the host, the host can not access the SSH server/Webserver of the guest anymore. Same situation with a Laptop connected to Internet via wireless when I disable the wireless adapter or set a wrong WPA key. My question is: is there a workaround for the host to access the guest services even if its Ethernet cable is unplugged / wireless is not available?

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• Installing CentOS 6.3 wrong hard drives order?

  - by Ken Tang

  I am trying to install CentOS 6.3 on new server that has 2xSSD and 1xHDD drives connected to mainboard's SATA ports by following order: SSD1 -> SATA1 SSD2 -> SATA2 HDD1 -> SATA3 On the installation process CentOS shows me hard drives by this order: /sda -> that is actually SSD2 /sdb -> HDD1 /sdc -> SSD1 It looks like CentOS assigns it randomly rather by the SATA connection order. My question is: What the order of drives /sd* depending on? And how can I change it to be by the order it connected to SATA? Thank you in advance!

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