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• DHCPD (Slackware) - Disabling auto-generation of gateway as DNS server

  - by Dogbert

  Good day, I am using a Linux workstation on Slackware 13.37. One "problem" I have had to deal with ever since 11.0 is the following: DNS servers are queried and determined at startup by DHCP daemon (DHCPD) This is invoked at startup by a script located at /etc/rc.d/rc.dhcpd My DNS servers for my ISP are resolved correctly, and are stored in a list located at /etc/resolv.conf However, the one annoying problem is that my gateway IP (ie: 192.168.1.1) is always automatically put at the top of the list in resolv.conf, meaning I have to always wait for a timeout before a valid DNS server is used to resolve an address (ie: timeout on 192.168.1.1 because it is not actually a DNS server, then DHCP uses the next server in the list). I could lower my DNS resolution timeout so the gateway query times out quicker, but that's not what I want, as I don't want to degrade the abilities of legitimate DNS servers. What I would like to do is change how DHCPD operates so that it does NOT put my gateway IP address at the beginning of this list. I've searched via "man dhcpd", etc, and haven't found the exact answer yet. Any help on this issue is appreciated. Thank you all in advance for your time and assistance.

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• HTTP, HTTPS and FTP is not working but SMTP and IMAP are working.

  - by nWorx

  Yesterday on a computer of a friend a strange thing happened. after booting the ports fo http, https and ftp are closed but e-mail is still working. in the control panel the windows firewall seems active even if he tries to deactivate it. I have a suspision that it is the faul of norton internet security 2010, we have tried to uninstall it, but the uninstallation did not work. when using the removal tool from symantec it just goes to 23% and then it crashes. the process ccSvcHst.exe is still running. How can I safely remove the rest of Norton Internet Security? Edit: Norton Internet Security 2010 is sucesfully removed, but still no connectivity...

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• Find routers IP address on the other side

  - by corsiKa

  Here's the basic setup of my network In this diagram: 1: The internet c: cable 2: Wireless router w: wireless connection 3: A win7 box with internet connection sharing enabled 4: A wireless router, but I'm only using its LAN capabilities to connect box 5 to the internet. 5: A win7 box, the computer I'm using to make this post. So its internet works just fine. Now if I'm on box 5, and I ping 192.168.1.1, I hit 4. If I'm on box 3 and I ping 192.168.1.1, I hit 2. Now obviously box 3 does not think 4's IP address is 192.168.1.1, or I wouldn't be able to connect to the internet. Okay, now that you know as much as I do about my network, here's my question: If I was on box 3, how would I determine the IP address of 4? Basically I'm running a webserver on box 5 and want to access this webserver on box 3 and other boxes. So that's the end goal. If there's other information there that can help, I'd appreciate it. Thanks!

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• How to fix unstable RJ45 jacks? [closed]

  - by BeemerGuy

  This is a little project I'm doing at home. I wanted to wire two rooms together (basically, the router is one room, and the switch is in the second room). So I ran a CAT5 between the two rooms, and wired an RJ45 jack in each room. I then hooked up the two jacks with two CAT5 cable to run it through the cable tester, and all 8 wires seem good. Now, when I connect the switch and the router, the connection is unstable -- I ping the router and it barely holds on for two pings before it disconnects, and stays in that unstable state. Just to make sure the router and the switch are ok, I connected them with long wire between the two rooms and the connection is absolutely stable, and pings continuously. What could be the cause for the unstable connection? Especially that it pings a few times, so there IS a connection. But why is it unstable? And how come the cable tester says it's ok, but it's unstable?

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• Raspberry pi slows down my entire network

  - by gnusouth

  Whenever my Raspberry Pi is connected to the network (via ethernet) the entire network is slowed to a crawl. On my main computer, ping times for google.com go from ~10ms to ~200ms and it takes forever to load web pages. Connections are also slow on the Pi, with an apt-get update showing pathetic speeds in the order of 1KB/s. Turning off the Pi completely removes the drag from the network. I've tried static and dynamic IP addresses for the Pi, but both have the same problems. I'm currently using Raspbian (downloaded today), but also had this problem with Arch Linux. I've checked the connection's duplex with dmesg | grep -i duplex, which shows that the Pi's connection is running at 100Mbps, full-duplex, as expected. My modem/router is a Billion 7404VNPX (an Australian thing); relatively high-end, albeit a bit buggy at times (it will occassionally delete all its firewall settings). It assigns IPs in the range 192.168.1.1 to 192.168.1.20 and has 192.168.1.254 as its own IP. When I assign static IPs I tend to use the 192.168.1.200 area. Does anyone have any idea as to what could be causing this weird slowdown? Or any tests I could try? Thanks

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• How do you document a network?

  - by Esteban Araya

  I'm not sure how to ask this question, since I'm not in the field. Say you're a network admin and you leave your job. How does the new guy know where to start?

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• Examples of applications where messages are guaranteed to turn up imediately

  - by James Hay

  I'm trying to find an example to show where data is sent from somewhere, whether manually or automatically, and is received IMMEDIATELY by the recipient, (doesn't matter whether we're talking mobile, desktop or whatever). An even better example would be where there were multiple recipients for the same message. It doesn't matter what the data is or the context it's used in, only the immediacy of receiving it. I was thinking that there might be some example in finance and the stock markets, but I haven't been able to find any through googling. IM clients are a great example of this and I think I'm basically looking for examples of applications that communicate over sockets. If anyone works on applications of this nature or knows of particular implementations, can you give me a quick run down of the use case and if it's commercial software the name of the software. This is all basically for research purposes so doesn't have to be particularly detailed. If anyone can help, thanks.

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• OpenVZ multiple networks on CTs

  - by user6733

  I have Hardware Node (HN) which has 2 physical interfaces (eth0, eth1). I'm playing with OpenVZ and want to let my containers (CTs) have access to both of those interfaces. I'm using basic configuration - venet. CTs are fine to access eth0 (public interface). But I can't get CTs to get access to eth1 (private network). I tried: # on HN vzctl set 101 --ipadd 192.168.1.101 --save vzctl enter 101 ping 192.168.1.2 # no response here ifconfig # on CT returns lo (127.0.0.1), venet0 (127.0.0.1), venet0:0 (95.168.xxx.xxx), venet0:1 (192.168.1.101) I believe that the main problem is that all packets flows through eth0 on HN (figured out using tcpdump). So the problem might be in routes on HN. Or is my logic here all wrong? I just need access to both interfaces (networks) on HN from CTs. Nothing complicated.

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• Measure Upload Speed between a client and our server

  - by tresstylez

  We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in particular UPLOADING documents through a form on our website. The client claims they have "bandwidth to spare" and that utilization of their "pipe" is so low that it MUST be our application, but our application has MANY clients and all features are working fine for all other clients. Interestingly enough -- DOWNLOADS (ie. just accessing the website, or downloading documents) is working fine. Speed test shows that they should get 1.2Mbps UP. So, a 3MB file should take 20 secs to upload. It takes 60+ seconds on their network. Sometimes even small files take OVER 10 minutes to upload or they timeout. Pings and Traceroutes don't show any abnormally long hops or response times. They claim other SAAS applications they use allow them to upload just fine. Both IT teams are working together to resolve this issue. What kind of data can I request from the clients to begin ruling things out. Seems like we need to somehow measure LATENCY of the networks involved or even at the switch level, we need to understand if packets are getting dropped somewhere and why. Where should I start? Any help is appreciated. I'll provide more info upon requests

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• Can I use two internet connections simultaneously in Windows 7?

  - by Chibueze Opata

  I have two internet connections - one via a 3G modem, and the other via wireless. The modem is faster so I normally browse with it, but it does not support torrent downloads while my wireless does. When the two are connected, my PC automatically makes every connection through the modem. Is there a way I can force a particular program, eg. uTorrent to browse through my wireless internet connection instead? Thanks.

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• OpenVPN bridge network from routed clients

  - by gphilip

  I have the following setup: subnet 1 - 10.0.1.0/24 with a machine used as NAT and also running an OpenVPN client subnet 2 - 192.168.1/24 with an OpenVPN server (the server in subnet 1 connect here) subnet 3 - 10.0.2.0/24 that uses the NAT machine (subnet 1) to access the internet, so all non-local traffic is routed there to the eth0 interface The OpenVPN client creates the tun0 interface and appropriate routing so that I can access machines from 192.168.1/24 [root@ip-10-0-1-208 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... Connected to 192.168.1.186. Escape character is '^]'. [root@ip-10-0-1-208 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0 0 eth0 10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.8.0.1 10.8.0.5 255.255.255.255 UGH 0 0 0 tun0 10.8.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 169.254.169.254 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 192.168.0.0 10.8.0.5 255.255.0.0 UG 0 0 0 tun0 However, when I try the same from subnet 3, it can't reach that machine. [root@ip-10-0-2-61 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... I suspect that it's because subnet 3 is routed to eth0 on the NAT machine in subnet 1 and it cannot jump to tun0. What's the easiest way to resolve it? I don't want to use iptables. I can't change the routing from machines in subnet 1 because it's done in AWS and so it works only with specific interfaces. Also, the NAT machine gets its IP with DHCP and so bridging is a bit complicated. IP forwarding is set on the NAT machine [root@ip-10-0-1-208 ~]# cat /proc/sys/net/ipv4/ip_forward 1 Thank you!

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• openVPN as a way to connect to a LAN by another client, different from server

  - by Einar

  Setup: one LAN handled by a router without a publicly available IP address but without any outbound connection restrictions ("target LAN"); a separate server publicly reachable from the Internet ("gateway"). I am trying to set up openVPN so that a third client can connect to the "gateway" and access the "target LAN". As the router of "target LAN" is not reachable from the Internet directly, it connects to the gateway itself via openVPN as well. The problem is how to handle routing. The LAN router has two network interfaces (for the outside network and the LAN itself). In openVPN (the server on the gateway) I set client-to-client and push "route 192.168.10.0 255.255.255.0" but I assume this would be horribly wrong (it actually messed up the routing on the LAN router until I killed openVPN). openVPN is not using bridging, is configured via tun. Other config details from the server server 10.8.0.0 255.255.255.0 client-config-dir ccd route 192.168.10.0 255.255.255.0 And the client file in ccd is iroute 192.168.10.0 255.255.255.0 What can be adjusted to ensure that a third client can connect through openVPN and access the LAN mentioned earlier?

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• Change source address based on destination IP

  - by hgj

  We have several "router" machines that gather a lot of external IP addresses on the same host and redirect, NAT or proxy the traffic to the internal network. They also act as routers for the machines on the internal network. This works fine, however I am unable to make the routing table, so I can change the source address, based on the destination a machine from the internal network want to access. Let's say I have a router, that has public addresses P1 (5.5.5.1/24) and P2 (5.5.5.2/24). All traffic goes through P1, but if necessary, the host is reachable on P2 too. This looks like this and works fine: > ip addr ... 1: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether aa:bb:cc:dd:ee:11 brd ff:ff:ff:ff:ff:ff inet 5.5.5.1/24 brd 5.5.5.255 scope global eth1 inet 5.5.5.2/24 brd 5.5.5.255 scope global secondary eth1:p2 ... Now I want to use P2 as the source address, if I want to access the Google DNS service for example (8.8.8.8). So I add a row in the routing table like: > ip route add 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 > ip route ... default via 5.5.5.254 dev eth1 5.5.5.0/24 dev eth1 proto kernel scope link src 5.5.5.1 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 ... But this does not work. If I ping 8.8.8.8, the host still uses P1 as the source address, and does not use P2 at all for outgoing connections. Am I doing it right? I guess not...

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• How to toggle wifi / bluetooth in Macbook Air with Windows 7 installed

  - by Barry Kelly

  I'm writing this on a MacBook Air 13" (the ones just released), but I have a problem. BootCamp provides no easy way of turning off the bluetooth or wifi radios, and nor are there any hotkey combinations on the keyboard, nor any hard or soft switches on the body to toggle these radios. As I'll be travelling a lot with this machine, what's the best way for me to comply with the cabin service crews' instructions and disable the radios before takeoff, and reenable them after landing?

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• How to build a private Wi-Fi Network server with VMware?

  - by Maarten Schermer

  For a school project, we have to build a Private network with VMware vSphere , which we can connect to with a Username and Password. On the network we want to create a folder for each Useraccount. Also we must have add a few groups (Admin,Customer,Manager). We must be able to connect to our network via the school Wi-Fi. We want to build a safe and secure network, with an easy way to access the network. Do you have any tips on how to approach this?

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• default virtual network interface

  - by Zulakis

  I got a single ethernet connection to a network but need multiple ips. Because of this, I am using virtual network interfaces like this: auto intern iface intern inet static address ... netmask ... gateway ...U auto intern:1 iface intern:1 inet static address ... netmask ... gateway ... I need to specify which IP should be used by default for outgoing traffic. How can I do that?

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• How to set a static route for an external IP address

  - by HorusKol

  Further to my earlier question about bridging different subnets - I now need to route requests for one particular IP address differently to all other traffic. I have the following routing in my iptables on our router: # Allow established connections, and those !not! coming from the public interface # eth0 = public interface # eth1 = private interface #1 (10.1.1.0/24) # eth2 = private interface #2 (129.2.2.0/25) iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -m state --state NEW ! -i eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -i eth0 -o eth2 -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow outgoing connections from the private interfaces iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT # Allow the two private connections to talk to each other iptables -A FORWARD -i eth1 -o eth2 -j ACCEPT iptables -A FORWARD -i eth2 -o eth1 -j ACCEPT # Masquerade (NAT) iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Don't forward any other traffic from the public to the private iptables -A FORWARD -i eth0 -o eth1 -j REJECT iptables -A FORWARD -i eth0 -o eth2 -j REJECT This configuration means that users will be forwarded through a modem/router with a public address - this is all well and good for most purposes, and in the main it doesn't matter that all computers are hidden behind the one public IP. However, some users need to be able to access a proxy at 192.111.222.111:8080 - and the proxy needs to identify this traffic as coming through a gateway at 129.2.2.126 - it won't respond otherwise. I tried adding a static route on our local gateway with: route add -host 192.111.222.111 gw 129.2.2.126 dev eth2 I can successfully ping 192.111.222.111 from the router. When I trace the route, it lists the 129.2.2.126 gateway, but I just get * on each of the following hops (I think this makes sense since this is just a web-proxy and requires authentication). When I try to ping this address from a host on the 129.2.2.0/25 network it fails. Should I do this in the iptables chain instead? How would I configure this routing?

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• how to configure svn between two remote system on different network?

  - by Ghost Answer

  The story is that I have two systems on two different network IPs (like client on 10.0.15.24 and server on 117.152.18.140). I am communicating between them by team viewer port 80. I have installed svn subversion on server and svn client on client system. I also installed apache server on server system. Now my question is that I want to configure them. first is it possible, if yes, then please give the proper suggestion. Is there any changes to be make in firewall on server or client or both. thanks

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• Vista to Vista network visability issue

  - by Sk93

  Hi All, I've got a Vista Business PC and a Vista Business Laptop connected via a virgin media router (Netgear CG2100D) and I cannot get the two machines to see each other correctly over the network. The laptop is connected via wireless, whilst the pc is wired. Both are set to recieve their network settings automatically (DHCP) and both have the windows firewall (the only firewall on either) turned off completely. I can ping each machine fine from one another using the ip addresses, and I can also connect via \. However, connections via \ fail, and I cannot see the machines in the network map. I have tried turning netBIOS to be "always on" on both adapters, but this makes no difference. I've been messing around pretty much for 6 hours now and am getting quite fustrated by this! (my original aim was to get media sharing working, but I've pretty much abandoned that for now). Any ideas?

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• HP laptop won't recognize wireless adapter

  - by Dennis Williamson

  I have an HP Pavilion dv6400 series laptop with an NVidea chipset which is the subject of a class action lawsuit. The symptom (PDF) that I'm experiencing is that the system fails to recognize that there is a wireless adapter installed. It doesn't appear in Device Manager. Is there some way, short of installing a new adapter, that I can work around this problem? The system is running Windows Vista Home and has the latest BIOS (F42) and Windows updates and drivers. See this related question where I ask how to use an old Windows Mobile phone as a Wi-Fi (not cellular data) tether.

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• Ubuntu Connect Button Disabled, cannot connect

  - by CSharperWithJava

  I'm trying to connect to my school network from Ubuntu 12. The network is WPA encrypted and I can connect just fine if the network manager establishes a connection automatically. However, when I get disconnected and try to reconnect a username and password prompt pops up. The credentials are already stored and are autofilled in correctly, but the Connect button is disabled so I can't actually connect to the network. What can I do? The only guess I've found so far is the password is too short and Ubuntu is expecting a full WPA key. I don't administer the school network though so I certainly can't change that.

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• Wifi Works with Android and Windows 8 but not Linux and Win 7

  - by eramm

  Support has told me that our company wide wifi network is setup to support mobile phones only. However it doesn't make sense to me that they can identify a mobile device rather they have setup the Access Point to use a protocol that is only supported on Android and Windows phones. Because the Access Point supports Windows mobile this means that laptops running Windows 8 can also connect to the Access Point (proven). So it stands to reason that since Android is based on Linux there must be a way to connect using Linux as well. iwlist shows IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : TKIP CCMP Authentication Suites (1) : 802.1x WIreshark seems to show that a connection is being made to a website to get a certificate and use a Domain Controller for authentication. Questions: 1) what protocol could they be using that is supported on Win Mobile and Android but not on Win 7 and Linux (Debian) ? 2) what tools can I use to help me discover what protocol i need to support ? I have used iwlist and wireshark but I was not able to glean to much useful information from them. I can post the results if needed. 3) is there an app i can use on my Android phone to help me understand what kind of network it is connecting to ? I can provide more information if you tell me how to get it. I just don't know what I am looking for.

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• How to route between 2 networks with a server with 2 network cards?

  - by LumenAlbum

  This is the first time I am faced with routing and it seems I have hit a dead end. I have the following scenario: client1: 192.168.1.10 255.255.255.0 gateway: 192.168.1.100 DNS server: 192.168.1.100 client2: 192.168.1.20 255.255.255.0 gateway: 192.168.1.100 DNS server: 192.168.1.100 server (Windows Server 2008 R2 with enabled RAS & Routing Services) network card 1 (connected to a switch along with the clients) 192.168.1.100 255.255.255.0 DNS server: 127.0.0.1 network card 2 (connected to the router) 192.168.2.100 255.255.255.0 gateway: 192.168.2.1 DNS server: 127.0.0.1 (DNS forwarding to 192.168.2.1) ISP router (with connection to internet) 192.168.2.1 Now in this scenario I have tried to route traffic from the 192.168.1.0/24 network with the clients to the 192.168.2.0/24 network with the routers to connect them to the internet. However, no matter what I do I get no positive ping to the router 192.168.2.1. Ping from 192.168.168.1.10 to 192.168.1.20: Success to 192.168.1.100: Success to 192.168.2.100: Success to 192.168.2.1: not reachable The routing table contains the 2 routes 192.168.1.0 and 192.168.2.0 as directly connected. Does anyone know where the routing fails? I have searched different forums but mostly found nothing relevant. One post however pointed out that in a similar situation the problem was that the router doesn't know the way back and the internet router would need a static route back to the first router. If that really is the case, I take it there is no solution with my equipment, because the standart ISP router doesn't allow to set any static routes.

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• Network structure --> Server 2k8r2 <--> Livebox <--> Router <--> Other PCs

  - by Yusuf

  I have a Livebox connection to the Internet and I have set up my network as follows: - Livebox <--> Win2k8R2 Server - Livebox <--> Netgear N150 Router - Router <--> Other PCs Therefore, in my LAN, - the Livebox has IP address 192.168.1.1, - the Router 192.168.1.12 (when accessed from the Livebox or the server), - the Router 10.0.0.1 (when accessed from the PCs connected to the Router), - the server 192.168.1.2, - the PCs 10.0.0.x I was using a previous configuration, which was as follows: - Livebox <--> Netgear N150 Router - Router <--> Win2k8R2 Server - Router <--> Other PCs Everything was simple, and I just had to forward all ports for incoming connection on the Livebox to the Router, and then forward the specific ports to the Server as needed (it must be however noted that any server I use is found on the Win2k8R2 server itself). In this previous configuration, the IP addresses were as follows: - Livebox 192.168.1.1 - Router 192.168.1.12 (when seen from Livebox) - Router 10.0.0.1 (when seen from server & PCs connected to it) - Server 10.0.0.2 - PCs 10.0.0.x So now of course, my port-forwarding does not work anymore since the server is not connected (directly) to the Router. What I would like to know is how do I configure the Livebox and Router to still have the features like before? From what I understand of networks (which is very limited, btw), I see these options: Make the router assign IPs like 192.168.1.x (but then I want the forwarding to be done from the router itself, is it possible?) The forwarding on the router to the server uses IP address 10.0.0.2. I could change it to 192.168.1.2 (Is that even possible, does it work?) Forward all ports from the Livebox itself to the server, and then manage them there (Is software-based port-forwarding as secure as hardware-based?)

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• Proxy the traffic in http and https from my iPhone/iPad to VirtualBox on my Mac

  - by Nicolas BADIA

  I've got a mac running a Debian VirtualBox which forward the traffic from 8080 on the mac to 80 in the box and from 8443 to 443. The domains with the extension .dev are redirected on the mac to 127.0.0.1 with dnsmasq. The traffic on IP 127.0.0.1 is forwarded from 80 to 8080 and from 443 to 8443 using ipfw. So with this settings, my Debian VirtualBox gets all the traffic of my .dev domains in http or https. What I want is to be able to proxy the traffic of my .dev domains in http and https from my iPad to my Debian VirtualBox on the mac. I've try to setup an HTTP proxy on the ipad but I can only do it for one port (and it's not working with the port 443). Any idea on how I could achieve that ?

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