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  • Iptables NAT logging

    - by Gerard
    I have a box setup as a router using Iptables (masquerade), logging all network traffic. The problem: Connections from LAN IPs to WAN show fine, i.e. SRC=192.168.32.10 - DST=60.242.67.190 but for traffic coming from WAN to LAN it will show the WAN IP as the source, but the routers IP as the destination, then the router - LAN IP. I.e. SRC=60.242.67.190 - DST=192.168.32.199 SRC=192.168.32.199(router) - DST=192.168.32.10 How do I configure it so that it logs the conversations correctly? SRC=192.168.32.10 - DST=60.242.67.190 SRC=60.242.67.190 DST=192.168.32.10 Any help appreciated, cheers

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  • Why can't my networks reach each other?

    - by HOLOGRAPHICpizza
    We have two Buffalo WZR-HP-G300NH2 routers, with the default firmware, DD-WRT v24SP2-MULTI (10/31/11) std - build 17798. Each has a separate cable internet connection with a public static IP address. They are both in the 24.123.68.0/24 space. Both of them can contact pretty much the whole internet, and they can both be accessed out on the internet with no problem, but for some reason they can't talk to each other! When I try to ping one from the other I always get "Destination Host Unreachable". There are no strange routing or firewall rules in place. And they are both set to respond to pings, I can ping them from outside. Our main IT guy is going to call our ISP on Monday, but I'm impatient, so does anyone have any ideas?

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  • How to make the jump from consumer support to enterprise support?

    - by Zac Cramer
    I am currently a high level consumer break/fix technician responsible for about 300-400 repairs a month. I am good at my job, but bored, and I want to move into the enterprise side of my company, dealing with Server 2008 R2 and exchange and switches and routers that cost more than I make in a month. How do I make this transition? Whats the best thing to learn first? Is there a standard trajectory for making this leap from consumer to business? I am full time employed, so going back to school is not a great option, but I have no life, so spending my nights and weekends reading and practicing is totally within my realm. I am basically overwhelmed by the number of things to learn, and looking for any advice you may have on the best way to proceed. PS - I apologize if this is a not quite the right forum for this, I know its not a technical question exactly, but I also know the sorts of people I want to answer this question are reading this website.

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  • How to connect a wifi router to a cable modem router?

    - by DavidD
    Here's the thing: I have a cable modem router (Thomson TCW710) with wifi-g that I rent from my cable company. I would like to use a wireless-n router (D-Link DIR-655, that I received for free) with it in order to take advantage of the faster wifi. I basically need advice on how to architecture my home network with these two beasts. What configuration should I need to apply on my old and new router to make it all work? The two routers will of course be connected together with a RJ-45 cable.

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  • How-To Geek is Hiring a Geeky Writer – Here Are the Details

    - by The Geek
    Think you have the perfect combination of geek knowledge and writing skills? We’re looking for an experienced writer to join our team, and here are all the details. We need a new writer to cover topics surrounding Windows 7 or 8, home networking, home routers, security, media, troubleshooting, mobile devices, and many similar topics. We are not looking for writers that focus solely on Linux or tech news writers. Please apply if you have the following qualities: You must be a geek at heart. You must be able to put in plenty of time, work, and dedication. If you’re too busy already, don’t apply. You must be able to write articles that are easy to understand. You must be creative. You must generate ideas for articles on your own, and take suggestions like a pro. You must be at least 18 years old. You must have solid English writing skills. You must be able to write tips, how-to articles, explainers, guides, instructional articles, etc. Again, we are not looking for tech news writers. Here’s a couple of our previous articles so you can get an idea of what we’re looking for in terms of quality and content. Please make sure to look through these before you decide to apply. How-to Article: Make Your Own Windows 8 Start Button with Zero Memory Usage Explainer: HTG Explains: When Do You Need to Update Your Drivers? Explainer: HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows? How-To Article: How to Factory Reset Your Android Phone or Tablet When It Won’t Boot How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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  • recent unreliable wireless connection

    - by gabkdlly
    Recently, my internet connection over wireless ( via a Netgear KWGR614 router ) has become unreliable, on both a Dell laptop running Ubuntu 10.04 as well as my Desktop running Ubuntu 10.10 . The problem does not seem to occur on a laptop running Windows Vista, nor on a Desktop running Windows 7 ( this machine is connected with an ethernet cable ). The problem does not seem to occur on my Openmoko Freerunner ( running Android 1.5 ), though I hardly ever use this device to connect over WLAN, so the problem may have just slipped by. On my main Ubuntu Desktop, I have tried the following wireless devices: a Longshine PCI card ( an old device with an RTL8180L chip ) a D-Link DWL-510 PCI card ( this device threw warnings in dmesg ) a USB device from MSI ( US54EX ). Usually my wireless network shows up in the network manager with a normal signal strength, even when the connection speed is slow or the connection gets reset ( asking me to click connect to re-authenticate my wireless connection ). I have observed this problem with a Netgear KWGR614 Router ( with the manufacturers firmware ), as well as with a TP-LINK TL-WR741ND router running OpenWrt. Taking a look at my routers logs, I find many instances of the following line: Tuesday,04 Jan 2011 03:53:01 [TCP SYN Flood][Deny access policy matched, dropping packet] I know that the Netgear router is susceptible to denial of service attacks, as I have previously been able to disrupt its operation by putting an nmap scan into a while loop. I use WEP or WPA to encrypt the wireless network. Is it possible that someone is jamming my signal ?

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  • Cisco ASA - NAT'ing VPN traffic

    - by DrStalker
    I have an IPsec VPN setup like this: [Remote users]-[Remote ASA] <-VPN-> [My ASA]-[Subnet A]-[Router 2]-[Subnet B] The VPN is set to handle traffic between [remote users] and [Subnet A]; it does not include [Subnet B]. Pretend the firewall rules for all routers are to permit everything. Now I want to redirect traffic that comes over the VPN to a specific IP on [subnet A] (192.168.1.102) to an IP on [Subnet B] (10.1.1.133) If I add a rule on [My ASA] to NAT traffic to original IP 192.168.1.102 to new IP 10.1.1.133, 1) Will this affect the connections coming in over the VPN? (ie: the VPN packets are unencrypted and then NAT is applied) 2) Will this work when the post-NAT target is on Subnet-B, which is not part of the VPN traffic selection?

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  • How to connect to my US network overseas via VPN?

    - by GiH
    I purchased an Apple TV for my parents and I have a netflix account. My parents live overseas, and I was wondering if they could use my account to get it to work. I read that it won't work unless you use proxies or a VPN, so I was wondering if its possible for me to setup a VPN to my network in the US instead of paying a service like StrongVPN? Setup: Router in US - Airport Extreme Router abroad - D-link (not sure of model) I know that the AppleTV doesn't have a built-in VPN client, maybe eventually when its jailbroken there will be an app, but as of now I'll have to use the routers right? Any other ideas are welcome as well!

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  • Ubuntu 12.04 desktop, VNC viewer not refreshing screen

    - by user73279
    I've had this issues across multiple machines and multiple versions of Ubuntu desktop (all 10.04 or later). Usually it happens with an old laptop I've put Ubuntu on but now it's happening on my primary dev machine (a quad-core PC recently upgraded to Ubuntu 12.04 desktop). The problem is this - I can connect to the machine and login with the password, the initial screen looks fine but never refreshes. I can see the monitor for the machine across the room and can see the mouse move and the menus pop up but the image of the screen on the PC in front me running the VNC viewer never updates. So the mouse and keyboard commands are working. Ubuntu 12.04 Desktop Ultra VNC Viewer (also seen with RealVNC's free VNC viewer) Desktop Sharing Static IP on eth0; Dynamic ID on eth1 I think it is an Ubuntu config issue because this PC used to work just fine with 9.04, 10.04, and 11.10 (over the past couple of years). I've also had a couple of laptops that used to have this issue with older Ubuntu's but don't with 12.04. Additional info: The Win7 PC I'm trying to use to control the Ubuntu PC is connected via 2 DLink 8-port gigabit routers. The Ubuntu laptop I usually control via VNC is typically only connected to the network via wireless. The screen refresh is choppy but usable. I've repeated the issue on a Win7 laptop which was connected via ethernet and wireless.

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  • ISP issue browsing "sonos.com" - need to diagnose and prove [closed]

    - by john
    I am unable to browse to a website "sonos.com" with my ISP (virgin). I have ruled out browsers, PCs, macs, routers, wifi, etc. Other ISPs (even other virgin connections in different areas!) supply this site no problem. I am 99% convinced there is a DNS issue lurking here. There is something fishy about the DNS for the site : What I notice is that online DNS sites tell me the right IP address for "sonos.com", but not for "www.sonos.com". Anyway when I type "sonos.com" the browser (any/all of the 4 I tried) fail to display the page. Firefox gives a "connection was reset" error. If I browse to sonos.com using the IP address it works OK. Browsing to www.sonos.com or sonos.com works fine with other ISPs of course. Questions: 1 Does anyone have any idea what might be going on here? 2 Any suggestions as to tools/monitors to help investigate/prove what is going on I can then take this up with virgin and/or sonos. Thanks

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  • Asterisk doesn't start properly at system startup. DNS lookup fails.

    - by leiflundgren
    When I start my Ubuntu system it attempts two DNS lookups. One to find out what my internet-routers external ip is. And one to find the IP of my PSTN-SIP-provider. Both fails. [Apr 7 22:14:54] WARNING[1675] chan_sip.c: Invalid address for externhost keyword: sip.mydomain.com ... [Apr 7 22:14:54] WARNING[1675] acl.c: Unable to lookup 'sip.myprovider.com' And since the DNS fails it cannot register properly a cannot make outgoing or incoming calls. If I later, after bootup, restart asterisk everything works excelent. Any idea how I should setup things so that either: Delay Asterisk startup so that DNS is up and healthy first. Somehow get Asterisk to re-try the DNS thing later. Regards Leif

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  • Is it safe to use a single switch for multiple subnets?

    - by George Bailey
    For a moment, forget about whether the following is typical or easy to explain, is it safe and sound? Internet | ISP supplied router x.x.x.1 (public subnet) | switch-------------------------------------+ | (public subnet) | (public subnet) BVI router (switch with an access list) NAT router | (public subnet) | (private subnet 192.168.50.1) +--------------------------------switch----+ (both subnets) | | computer with IP 192.168.50.2 ------+ +----computer with IP x.x.x.2 I don't plan to implement this setup, but I am curious about it. The 50.2 computer may send a packet to the x.2 computer, but it will use 50.1 as the router, since 50.2 knows that the subnet is different. Would this result in the packet being received twice by the x.2 machine, first directly through the switch, second by way of the two routers? Do you see any problems with this aside from how confusing it is, and that it would put one switch doing the work of two subnets?

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  • pfSense - DHCP Relay

    - by Patrick
    I have 3 pfSense boxes acting as routers on a single subnet (172.22.12.0/26). Router A - 172.22.12.1 Router B - 172.22.12.17 Router C - 172.22.12.33 I want Router A to be the only DHCP server. Router C has DHCP relay enabled that points to Router B. Router B then has DHCP relay enabled that points to Router A. Like this: Router C -- Router B -- Router A (DHCP Server) Router B gets an IP from Router A, but Router C does not. Any ideas why this configuration isn't working? Thanks.

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  • How to connect a remote IP Phone to our VOIP Network?

    - by Mistiry
    We have an IP phone system in our office, and about 8 VoIP phones running on the system. We have a remote worker, who is literally states away. We'd like to connect his phone to our VoIP network, so that he has a business phone and an extension to which we could transfer calls. I was thinking, although I don't know for sure, that a pair of Cisco routers could be used in some way to make this work. I imagine a VPN solution, where I have one router connected to the phone network and the other router connected to the remote phone. Then have a site-to-site VPN set up so that the remote router... And that's where I'm stuck. I know the remote router will need to use the DHCP server of the phone system. I've never set up something like this, so I am seeking the help of the community here. What is the best way to get this remote VoIP phone RELIABLY connected to our internal VoIP network?

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  • No internet on some devices, still on WiFi

    - by Joost
    Ok, here's the situation. I live with 3 friends, and we often sit in the living room with laptops out. There's a WiFi router in the kitchen, and we have quite a stable connection. The issue, however, is this: sometimes, all of a sudden one of my friends loses internet connection. Even disconnecting/reconnecting to the WiFi network does not help. When we restart the router, though, it works like a charm again. The odd thing is, it happens just for this one Windows 7 laptop. We've switched routers (for a different reason) in the mean time, but the issue remained. This makes me suspect the laptop even more. I realise I've given little details, but I don't really know what to try/do. Any suggestions what it might be?

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  • Access my router's gateway network?

    - by Danpe
    I have 2 routers in my place. Main Router (Connected to the Internet) - 192.168.1.1 Secondery Router (Connected to the Main Router) - 192.168.0.1 I have a Network Storage Device and few Shared Directorys connected to the Main Router. (Network Storage - 192.168.1.16) How can i acces one of them using a PC connected to the Secondery Router? Home Network Diagram: I currently have access to the internet using both laptop and Main PC. But i want to get access from my laptop to the Storage and to ym shared directorys. The problem is the my Main router always forwards all packets stright to the WAN.. (Internet)

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  • Asterisk doesn't start properly at system startup. DNS lookup fails.

    - by leiflundgren
    When I start my Ubuntu system it attempts two DNS lookups. One to find out what my internet-routers external ip is. And one to find the IP of my PSTN-SIP-provider. Both fails. [Apr 7 22:14:54] WARNING[1675] chan_sip.c: Invalid address for externhost keyword: sip.mydomain.com ... [Apr 7 22:14:54] WARNING[1675] acl.c: Unable to lookup 'sip.myprovider.com' And since the DNS fails it cannot register properly a cannot make outgoing or incoming calls. If I later, after bootup, restart asterisk everything works excelent. Any idea how I should setup things so that either: Delay Asterisk startup so that DNS is up and healthy first. Somehow get Asterisk to re-try the DNS thing later. Regards Leif

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  • port forwarding using 3 static ip addresses

    - by Danny
    I am new to configuring routers. We have purchased a RV016 Cisco business router that has multiwan capability. What we are attempting to do is take map services from 3 different servers and assign 3 different static IP addresses and then forward port 80 through the router. A short term solution to building a proxy server. Is this possible? Right now we have a consumer grade Cisco router and assign a static IP and it works, we attempted the same settings on the business router and cannot get to the internet. We set it DHCP and it works fine, however we want to to forward the static ports not use DHCP.

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  • What to do if people can't ping me?

    - by slayerIQ
    Today, I installed my new router so I can connect my other pc and my ps3. In my network, there are some other computers these are connected with each other through another router. So I have one modem with 2 routers that make up my network. Everything works fine the only problem I am having is being pinged by other computers in the network. All the computers are on the same subnet 255.255.255.0. There is no problem with my firewall or anything I tested everything. How can I solve this?

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  • Why are there so few Wireless N Dual Band adapter PCI cards, only USB adapters instead?

    - by daiphoenix
    There has been several Wireless N Dual Band routers/APs out in the market for quite some time now, and there are several Wireless N Dual Band USB adapters out there. But as for PCI/PCI-X card adapters, there seems to be only one (the Linksys WMP600N). Why is that? I find it very strange. Is it because the USB adapters are easier to install, and can be used on multiple computers? But if so, why isn't it the same case with single band (2.4 Ghz) wireless N adapters? Because for these ones there as many PCI card adapters as there are USB adapters. Also, can the USB adapters, despite the lack of external antenna, offer the same level of performance as a card with external antennas?

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  • Colocation and HSRP setup

    - by WinkyWolly
    My colocation provider has setup HSRP for us and has provided us 2 drops (plugged into 1/1/1 and 1/1/2) from their routers as well as a /29 with 2 HSRP IP's and the rest of the /29 usable for the switch. I know that HSRP should be pretty much plug and play as long as the ports are in the same VLAN. However I'm confused as to how to the IP setup should work. Currently I've assigned port 1/1/1 the full /29 however I think this is incorrect because if I were to unplug it port 1/1/2 wouldn't work as it has no IP assignment. What's the proper way to do this?

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  • Is there a way to automate testing for a GNS3 network topology?

    - by Chedy2149
    I'm working on an MPLS backbone topology using GNS3, this topology includes configuration of several networking technologies such as IPv6, BGP, OSPF, IPv6 to IPv4 dynamic tunneling, MPLS based VPNs, MPLS based traffic engineering... So I'm a beginner with basic knowledge in networking (Ipv4 addressing, basic routing and switching) and I can't just easly test if my topology works or not, moreover fiddling with configuration I've noticed that sometimes when getting MPLS config right and missing BGP config all my topology is messed up. Given that I use Cisco 7200 series routers, is there any way to build a test harness for my topology in order to guarentee correctness with a single push button automated process?

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  • Using a Dell PowerConnect to set up load balancing/redundancy, 1 switch 2 routres 2 private wan link

    - by MarianoC
    Hi, We have different locations connected by two different WAN providers. Each site has a dell powerConnect 6224 and two cisco routers with the WAN connections (we don’t have access to router admin). The 6224 connects to each cisco LAN port and to our LAN backbone. We would like the 6224 provide the ip gateway address and load balance and support redundancy, if one of the routes fail. Is this possible?. We can't find any samples on doing this and we have tried with no success. Any help or link to documentation regarding this, will be greatly appreciated. Thanks, MarianoC

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  • I have a wireless Canon P560 and my computer can't find it

    - by ed
    The printer is wireless and I haven't connected it via USB. I set the configurations for the Wi-Fi access point in the printer and it connected to my Wi-Fi. I have AT&T as the service provider and the 2Wire router. When I access the router in the browser I see that the printer is connected but when I run the software to detect the printer the computer can't find it. I have a Mac with Snow Leopard. I tried to detect the printer with another device and it can't find it. Is there a port that needs to be open for wireless printers? Because I tried putting the routers firewall settings for the device to its lowest and the computer still can't find it. Let me know. Thnx.

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  • How to connect to my US network overseas via VPN?

    - by GiH
    I purchased an Apple TV for my parents and I have a netflix account. My parents live overseas, and I was wondering if they could use my account to get it to work. I read that it won't work unless you use proxies or a VPN, so I was wondering if its possible for me to setup a VPN to my network in the US instead of paying a service like StrongVPN? Setup: Router in US - Airport Extreme Router abroad - D-link (not sure of model) I know that the AppleTV doesn't have a built-in VPN client, maybe eventually when its jailbroken there will be an app, but as of now I'll have to use the routers right? Any other ideas are welcome as well!

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