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• Using iptables to forward traffic destined for specific ip via specific interface

  - by shapeshifter

  I want to forward traffic destined for a specific ip from my internal network via a specific interface. I have two interfaces which are currently load balanced. I need all requests for a certain ip to go out via eth0 otherwise my external ip changes and sessions are dropped. eg. all requests from 10.1.1.1/24 to ip 11.22.33.44 on port 443 must go out via interface eth0. How can I do this with iptables?

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• route http and ssh traffic normally, everything else via vpn tunnel

  - by Normadize

  I've read quite a bit and am close, I feel, and I'm pulling my hair out ... please help! I have an OpenVPN cliend whose server sets local routes and also changes the default gw (I know I can prevent that with --route-nopull). I'd like to have all outgoing http and ssh traffic via the local gw, and everything else via the vpn. Local IP is 192.168.1.6/24, gw 192.168.1.1. OpenVPN local IP is 10.102.1.6/32, gw 192.168.1.5 OpenVPN server is at {OPENVPN_SERVER_IP} Here's the route table after openvpn connection: # ip route show table main 0.0.0.0/1 via 10.102.1.5 dev tun0 default via 192.168.1.1 dev eth0 proto static 10.102.1.1 via 10.102.1.5 dev tun0 10.102.1.5 dev tun0 proto kernel scope link src 10.102.1.6 {OPENVPN_SERVER_IP} via 192.168.1.1 dev eth0 128.0.0.0/1 via 10.102.1.5 dev tun0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.6 metric 1 This makes all packets go via to the VPN tunnel except those destined for 192.168.1.0/24. Doing wget -qO- http://echoip.org shows the vpn server's address, as expected, the packets have 10.102.1.6 as source address (the vpn local ip), and are routed via tun0 ... as reported by tcpdump -i tun0 (tcpdump -i eth0 sees none of this traffic). What I tried was: create a 2nd routing table holding the 192.168.1.6/24 routing info (copied from the main table above) add an iptables -t mangle -I PREROUTING rule to mark packets destined for port 80 add an ip rule to match on the mangled packet and point it to the 2nd routing table add an ip rule for to 192.168.1.6 and from 192.168.1.6 to point to the 2nd routing table (though this is superfluous) changed the ipv4 filter validation to none in net.ipv4.conf.tun0.rp_filter=0 and net.ipv4.conf.eth0.rp_filter=0 I also tried an iptables mangle output rule, iptables nat prerouting rule. It still fails and I'm not sure what I'm missing: iptables mangle prerouting: packet still goes via vpn iptables mangle output: packet times out Is it not the case that to achieve what I want, then when doing wget http://echoip.org I should change the packet's source address to 192.168.1.6 before routing it off? But if I do that, the response from the http server would be routed back to 192.168.1.6 and wget would not see it as it is still bound to tun0 (the vpn interface)? Can a kind soul please help? What commands would you execute after the openvpn connects to achieve what I want? Looking forward to hair regrowth ...

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• IPTABLES route, redirect, forwardc traffic

  - by Anthony

  I am trying to redirect traffic from one IP reached on a specific port to a website. For example I have two external ips, lets say 194.145.63.1 and 194.145.63.2 set on one network card as 194.145.63.1 - eth0 and 194.145.63.2 -eth0:1 mywebsite.com allows access only from 194.145.63.1 and I want to set my rules like if I hit http://194.145.63.2:8080 to open mywebsite.com trough 194.145.63.1. Thanks in advance!

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• Redirect all outgoing traffic on port 80 to a different IP on the same server

  - by Spacedust

  I have multiple IP addresses on the same server and I would like to redirect all outgoing traffic on port 80 to a different IP on the same server just no to use always main IP. Currently I'm using this: /sbin/iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source IP; and it works well, but it redirects everything and when I make backups over SSH backup it's failing. System: CentOS 5.8 64-bit

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• proxy RDP traffic through SOCKS5 proxy, using Windows

  - by ptrn

  I'm having bit of trouble. I have a server at school that's hosting a database. Normally I've been connecting to it through a VPN-connection, but earlier today it went down. I've checked with other people, and it's definitely down, so the fault's probably not at my end. Is there a way I can proxy RDP traffic through a SOCKS5 proxy?

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• mobile broadband quick connect..how to?

  - by Ubuntuser

  Hello all, I have a Reliance broadband + mobile broadband connection. It connects fine, but the only problem is it takes more than 2 -3 mins to get the connection started. If I plug in the USB datacard, the network manager applet dothes not show up the mobile broadband connection immediately. It takes a good 2-3 mins to detect the connection before I can select Reliance connection from the dropdown list. Is there any way of getting a shortcut of that connection on the desktop or on the panel? Thanks, Sayantan

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• Realtek 8188ce stops working after 2minutes

  - by Max M

  I am using ubuntu 12.10 on an hp dm4-2191us via wubi with the Realtek 8188ce wifi adapter. Everything works very well with the exception of the wifi. I have used wicd and it didn't worked at all so i went back to Network Manager with variable success. It works for 30 min - 2 min before i have to reconnect to get it to work again. I would really like to use Ubuntu (it is a better platform in my opinion) but no wifi could really be a deal breaker.

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• Is it possible to auto-mount sshfs

  - by Mark D

  Is it possible to auto-mount a remote FS using sshfs upon instantiating a proper VPN connection? Allow me to explain the scenario, I'm working remotely, to do that it helps if I can mount my home dir from a server in the office. To do that I need to vpn in. So within network manager I select the relevant VPN and connect. It connects but now I have to drop to the command line and mount my home dir on several machines. If I forget to do one machine my local dev environment isn't as efficient. I suppose I could write a quick bash script to do this but I'd rather get it running automatically when I connect.

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• What does a media server need?

  - by DeaDSouL

  I want to buy a new PC to be used as a media server that streams HD movies, music to any wireless device on my network (laptop, desktop, TV, etc.). I was wondering about the PC hardware's specifications that I need to have so that it can work just fine? (It will be wireless) Is there any tutorial showing how it could be done? And the security - how can I secure it? As well as I need it to to host my emails. I mean I have many emails. And sometimes I'm using desktop, sometimes laptop.. so is it possible to make the server store a copy of my emails, attachments, all sent items (whether they were from desktop or laptop)?

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• Redirect all traffic to specified hosts behind NAT

  - by biesiad

  Is there a possibility to redirect all traffic to specified hosts behind NAT? For example i have a server, a domain "mydomain.com" and 3 hosts behind NAT. I wish to configure 3 subdomains: host1.mydomain.com host2.mydomain.com host2.mydomain.com and each of them to redirect all ports to specified host in local net. That redirection should provide funcionality like this: http://host1.mydomain.com (can be achieved using apache) ssh [email protected] (???) and other protocols on diferent ports Thanks for any help.

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• Secure linux distro that sends traffic through Tor

  - by gravestone

  I'm looking for a live Linux distro that is secure and preserves my anonymity online. For what I need, Tor seems to do the job – but such software requires configuration that someone who is not knowledgeable in how it works might find difficult. I was looking at 'Lightweight portable security' but it does not specify whether it sends all traffic through Tor. Does anyone know more information about it and/or any other such live Linux distro?

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• isa 2006 blocks outgoing traffic with no rule specified

  - by codesnik

  I've created a rule near the top, allowing all outgoing traffic from "All Users" from specified IP range to external network. However, connections are blocked sometimes for no apparent reason. For example, one attempt to ssh to an external server would fail, and another immediatelly after that - won't. to the same server! logging shows thoose failed connections as denied, but "rule" column is blank. any suggestions?

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• How to setup VPN as Proxy

  - by Nicolas Nox

  I have an PerfectPrivacy VPN connected via the OpenVPN-Network-Manger-Plugin (Ubuntu 12.04.1) and I want to assign a system wide proxy over that VPN. I have tried proxydriver that should do that automatically, but it works partially. The browser says that I have the IP of the VPN, but when I tried to send an eMail over SMTP (Port 25), I can´t connect to the mail server. In our company the smtp server port is closed, but that should be not a problem, when I do that over a VPN, shouldn´t it? greetings

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• iptables rule for forwarding outbound traffic

  - by Claudiu

  I am trying to forward the outbound traffic to another server. Current rule is: /sbin/iptables -A OUTPUT -p tcp -s localhost -o 91.xxx.xxx.xxx --dport 65000:65010 -j ACCEPT but when I do a iptables -L, the rule its showed like this: ACCEPT tcp -- localhost.localdomain anywhere tcp dpts:65000:65010 So I guess my rule is bad written since the "destination" column shows "anywhere" Can you help me with this?

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• forward outbound traffic rule

  - by Claudiu

  I am trying to forward the outbound traffic to another server. Current rule is: /sbin/iptables -A OUTPUT -p tcp -s localhost -o 91.xxx.xxx.xxx --dport 65000:65010 -j ACCEPT but when I do a iptables -L, the rule its showed like this: ACCEPT tcp -- localhost.localdomain anywhere tcp dpts:65000:65010 So I guess my rule is bad written since the "destination" column shows "anywhere" Can you help me with this?

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• Internet connection crashes while wifi / lan stay connected

  - by pirad

  I am connected to a router by wifi or lan. But every few moments (sometimes seconds, sometimes half an hour) my connection to the internet breaks down. So in one moment I can surf with my firefox and have ping times of 20 ms (wifi) to the google server. And in the next moment I can't open any pages in any browser and the ping shows no new messages first and then "Destination Host Unreachable". This is especially odd as another computer or my smart phone stays connected at the same time to the same network and seems to notice nothing. So I have a problem independend of wifi or lan drivers but with something else. Where should I look for logs that could tell me more information? I can't find some in syslog. Just if I reconnect to the router (wich works for another few moments) there are a lot of informations. But everythin is okay then.

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• A peculiar issue with nm-applet

  - by montreux

  There is a somewhat strange error that I've noticed with my gnome sessions. It's not a problem that causes a lot of trouble, but at times it becomes annoying. Anyway, here it is: when I fire up gnome-session-fallback (which is the main one I use), the network applet doesn't run with root permission. Here is what it looks like http://i.imgur.com/8kc7Vrd.jpg . On the other hand, here is what the regular gnome session looks like http://i.imgur.com/wfkkE3E.jpg . From the regular session I can easy edit and add networks, but from fallback session I cannot add/edit anything, or turn off/on the wireless or networking. Any ideas?

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• Connecting with a BSNL Broadband Internet

  - by user10026

  I am not able to connect my broadband connection with ubuntu and it doesnt work. The connection works fine when I use Windows7 but when i use ubuntu I am not able to access the internet. I followed various steps mentioned in various sites and still could not find a solution. I have installed ubuntu 8.04 in my system. The interface eth0 is not at all detected and when i use the menu system-administrator-network I am not getting an option for wired connection. Just the Wireless connection and Point to Point connection tabs are available.. It's really urgent.. I'll be very happy if u guys can propose to me a working solution to deal with this problem..

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• HTG Explains: What’s the Difference Between the Windows 7 HomeGroups and XP-style Networking?

  - by Jason Fitzpatrick

  Windows 7 rocks a new method of file and print sharing that’s a departure from the frustrating file and print sharing found in earlier versions of Windows. What is it and how can you benefit from it? Read on as we explain. HomeGroups are a new edition to the Windows ecosystem as of Windows 7. They’re intended to (and succeed at) greatly reducing the frustration experienced by users who want to easily share files between computers as well as share printers with the entire network. Let’s take a look at the state of home networking and how it has evolved.Internet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?How To Make a Youtube Video Into an Animated GIF

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• How can I capture a process's network traffic?

  - by Yassin

  I would like to capture the traffic generated by a specific process (using Wireshark or other packet sniffer). Does anyone know how to do it? Thanks!

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• configuring two network interfaces in ubuntu 10.04.1

  - by Bill Smith

  I have got two NICs configured on a VM - each is tied to a specific network, one is a DMZ, the other is an internal network. I want MySQL to listen on the internal network only and Apache on the DMZ listening for HTTP and HTTPS. But as soon as I add the second interface I run into trouble. I can hit HTTP on either interface, but can not hit 3306 on the internal network for MySQL. Here's the config... could someone sanity check this please? auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 10.153.24.230 netmask 255.255.255.240 network 10.153.24.224 broadcast 10.153.24.239 dns-nameservers 8.8.8.8 auto eth1 iface eth1 inet static address 10.153.24.195 netmask 255.255.255.224 gateway 10.153.24.193 broadcast 10.153.23.223

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• How to set the preffered network interface in linx

  - by Mike Cooper

  I have my network set up like this. http://docs.google.com/Doc?docid=0AZ1YxuLE4djaZGhqN2s1NmRfMjhjNjc0Ym1meg&hl=en In words: I have a machine (Calcium, running Arch Linux) that has two network interfaces. eth0 is hoooked up to a router, and is gigabit. Eth1 is hooked up directly to the university network over 10Megabit. The router's uplink is hooked up to the university network as well, and it is also 10Megabit. Currently (I believe) all traffic on Calcium is going through eth0, through the router, regardless of whether it is internal or external. (How can I confirm this?) Ideally, traffic that is destined for the internal network (192.168.10.0/24) would travel over eth0 to the router, and wherever it is going. ALL other traffic should go over eth1. I suspect that this behavior could be acheived with IP tables? I don't really know where to start looking to learn that though, so any links would be appreciated.

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• Mac OS X: network disabled because security breach

  - by fireeyedboy

  Dear all, I just recieved a message on my Mac OS X system telling me (loosely translated from Dutch): "The network has been temporarily disabled because the network's security was breached." (It's a wireless WPA2-PSK secured network BTW) I looked in the logs of my router (a Zyxel P-2602HW-D1A) only to see a few (outbound) "syn flood TCP ATTACK" logs, but those were from like a week ago, other than that nothing. What tools on Mac OS X do I have to analyse this security breach occurence? Are there some security logs on Mac OS X that I can inspect? What other measurements should I take? And how serious should I take this warning from Mac OS X? System: Macbook Pro Intel Core 2 Duo 2.2 Ghz OS: Mac OS X 10.5.8 Network: wireless WPA2-PSK Relevant software: Parallels Desktop with Windows XP (was open, but stopped at the time) Other systems on my network: Windows XP SP3 desktop (was running at the time) If you need any more info, don't hestitate to ask. Thanks in advance.

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• How to set the preferred network interface in linux

  - by Mike Cooper

  I have my network set up like this. http://docs.google.com/Doc?docid=0AZ1YxuLE4djaZGhqN2s1NmRfMjhjNjc0Ym1meg&hl=en In words: I have a machine (Calcium, running Arch Linux) that has two network interfaces. eth0 is hoooked up to a router, and is gigabit. Eth1 is hooked up directly to the university network over 10Megabit. The router's uplink is hooked up to the university network as well, and it is also 10Megabit. Currently (I believe) all traffic on Calcium is going through eth0, through the router, regardless of whether it is internal or external. (How can I confirm this?) Ideally, traffic that is destined for the internal network (192.168.10.0/24) would travel over eth0 to the router, and wherever it is going. ALL other traffic should go over eth1.

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• Docking Station Disabling/Enabling Network Connection

  - by bryan_cook

  Whenever I dock my laptop onto my docking station, Windows disables my Wireless Network Connection and enables my Wired Network Connection. Whenever I undock my laptop, Windows disables my Wired Network Connection and enables my Wireless Network Connection. Is there a way to disable this feature? After Windows performs the automatic disabling/enabling, I run into errors when I try to disable the now-enabled connection, specifically "It is not possible to disable the connection at this time. This connection may be using one or more protocols that do not support Plug-and-Play, or it may have been initiated by another user or the system account." I'm assuming the latter portion of the error is true ... my network connections are being enabled/disabled under a system account. Regardless, I'd just like to disable the feature altogether. For reference, I'm working with Windows XP Professional on a Dell Latitude D630. Thanks in advance!

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