Networking :: Most Common Method To Route Network Traffic As A Router/proxy
Apr 22, 2011
I am using Debian 5 and I have some networking experience, however I want to learn to do this the best way possible. I have a Debian box with two nics and I want to connect that to a switch and use my Debian box as a router basically, as well as having a firewall setup within that too.
Should I use iptables to set up nat or the route command or what? I just want to know the group of tools to use in order to set up my network. Network diagram: Internet <------> Debian Box <----> switch <----> hosts I found some guides but they are for linux 2.4 and i'm not sure if they are right.
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Sep 4, 2009
I wanted to know if i can install mrtg on a client computer in network and measure the network's router traffic.i know that it can be installed on the server.
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Aug 9, 2010
In my "computer room" I have an ATT U-Verse TV decoder box and my computer connected to a Netgear Switch. The third port on the switch connects to the ATT router. I've just noticed that when I power on the U-Verse TV box I start getting a lot (200-250 KiB/s) of received packets on my Debian Lenny machine as shown in the System Monitor app. I don't show any outgoing traffic in response. That explains why the lights on the switch are blinking at the same rate for both devices. So, what, if anything, is this telling me? Is this normal, or is the ATT router spamming my Linux machine for some reason? Is this a potential problem?
Added: Or is this just telling me that the NetGear FS-105 is not actually an ethernet switch?
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May 11, 2010
I've succesfullly connected to my vpn with kvpnc, but none of my traffic is going through the vpn! I dont know how to route traffic to the vpn. for instance, when I go to whatsmyip.com it still has my previous ip.
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Oct 28, 2009
At the moment I have a proxy and all the users have to configure it in the browser to access internet. I want to make the users able to browse even without configuring the proxy in the browser. but eventually it should be received in the proxy rather than giving an error to the user. I heard with transparent proxy I can redirect all the traffic from a particular network, to a particular host( ie my existing proxy).
I tried this using firewall rules. But then the existing proxy doesn't understand the protocol of the requests. I heard that it should be in the kind of proxy protocol.
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Mar 4, 2010
My ISP has given me 3 IP addresses to use for the internet (76.148.200.3, 76.148.200.4 and 76.148.200.5).
If I do a "wget whatismyip.com" or netcat into another server, I am appearing as 76.148.200.3.How do I change my route (command line) in linux to route internet traffic through 76.148.200.5?
Code:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
code....
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Mar 28, 2010
I have eth0 and tun0. tun0 is a VPN tunnel going over eth0. Everything on the other end is setup and working fine, when I type Code: traceroute 4.2.2.1 I see my the ping is going over 192.168.2.99 (eth0). When I then type Code: route add -net 4.2.2.1 netmask 255.255.255.255 dev tun0 traceroute 4.2.2.1 I see ping is going over 10.8.0.1 (tun0) instead of eth0, so that is working
What does not work however is when I do Code: route add -net 0.0.0.0 netmask 0.0.0.0 dev tun0 traceroute 4.2.2.1 I get no ping! I believe the problem is because all traffic is routing over tun0, which means even the VPN tun0 needs to go through eth0, it can no longer do this. Is there a way around this where I can route everything except for 114.77.31.26 (which is my VPN gateway for tun0)?
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Mar 18, 2011
I just installed a fresh copy of debian (no GUI). I want all my traffic on bash (such as when I do ping or dig or wget, basically whatever) to be sent to localhost:8080. How can I do that? I've a ssh port forward setup that will forward all traffic arriving at my localhost:8080 to another server.
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Dec 10, 2010
I'm running Linux Mint 10 . I have a wireless PCMCIA card (Linksys WPC 11 ver.3) that I've put into master mode, and I'm trying to set up my laptop as a wireless hotspot. I am very confident that I want to do this and have no interest in using a wireless router....I say that because that topic inevitably comes up with posts like this. The problem I'm having is I don't understand how to get wlan0 and eth0 to "talk" to each other...That is, I don't know how to set it up so that traffic from wlan0 goes through eth0, so that devices that connect to my hotspot can access the internet.I've seen a few guides about this, but they were either much broader in scope (i.e. much more complex), or for other distributions, etc, and it's too much for me to follow as a linux .
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May 10, 2011
I am trying to set up a Linux box that can act as a router (and firewall later). I have a Debian 5 installation and it has two nics in it. I am trying to use the linux route command to set up a route between the two interfaces. I am finding it difficult to do. Let me explain how I am trying to set up my network: I have the ethernet cable from my modem connecting to eth0 of my Debian box, then I have eth1 connecting to a switch, which I connect all my computers and other devices to. I want to have two different ip address schemes for the devices. So here is my interfaces file:
Code:
#eth0 connects to modem
allow-hotplug eth0
iface eth0 inet static
[code]....
So I am wondering, to get my ethernet traffic from eth0 to eth1 and vice versa, do I need to make it so the Gateway for Destination 192.168.1.0 is 10.1.1.1, and for Destination 10.0.0.0, Gateway 192.168.1.0? I have looked at the linux manpage for route and I am still confused. I have also looked at the Debian networking page, but it is still unclear to me how to do this. how I am to use the route command to get this working? Or am I not even supposed to use the route command?
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Aug 21, 2010
I have a linux router with 2 physical ISPs and a VPN tunnel that all my traffic passes through. I would like to setup a rule to redirect all traffic from one internal IP address (10.0.0.x) through the physical link only. My current script is as follows.
iptables -F
iptables -X
echo 1 > /proc/sys/net/ipv4/ip_forward
[code]....
My goal is to do something similar to the mangle on the tor traffic, but for an entire host.
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Mar 2, 2011
The task I am trying to complete is the virtualization of an IPv6 router created using two fedora machines. Here is the physical setup I have now...
PC1:eth0 <------> network
PC1:eth1 <------> PC2:eth0
PC1:eth2 <------> PC2:eth1
PC1 runs radvd to provide router advertisements to the network and a DHCPv6 server for stateful addresses.Each interface is configured on a separate subnet. PC2 runs a DNS server on eth0. PC2:eth1 is used as an IPv6 client for testing purposes. The connections from PC1 to PC2 are just crossover cables.I've created virtual machines of both PCs and have created 4 virtual adapters on the host machine for each of the local-only interfaces.Now I have this:
PC1:eth0 = HOST eth0
PC1:eth1 = HOST vboxnet0
PC1:eth2 = HOST vboxnet1
[code]....
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May 7, 2011
My linux machine is connected to the outside internet, and I have a minecraft server running on an internal machine (192.168.1.201). Right now, I am forwarding port 80 on the linux machine to 192.168.1.30, which is working.
iptables -t nat -I PREROUTING -i eth0 -d 192.168.1.30 -j DNAT --to-destination 192.168.1.201
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED,RELATED -j DNAT --to 192.168.1.201
______________________________
I want to filter out the GET/POST requests and forward them to port 8080. I can't seem to get that working.
I've tried this:
iptables -A INPUT -d 192.168.1.30 -p tcp --dport 80 -m string --algo bm --string 'GET' -j REDIRECT --to-ports 8080
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Nov 21, 2010
My Ubuntu Box has 3 interfaces. eth0 (Internal 192.168.1.0/24)eth1 (External ISP DHCP)eth2 (External ISP Static IP)I need the outgoing traffic to internet for 1 of the internal pc (192.168.1.10) to only go only go through eth2
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May 20, 2010
I installed and configured a squid transparent proxy on my linux os at work. Also it is veryslow but every thing is ok while I do not try to use port 443,so when I try to use sites like mail.yahoo.com or other which are using https(443) port and the method used is CONNECT I see some errors in access.log like:
"NONE/400 xxxxx CONNECT error:method-not-allowed - NONE/- text/HTML"
and in cache.log somthing like:
""WARNING CONNECT method received on http Accelerator port 3128"
""WARNING for request: connect CONNECT login.yahoo.com:443 HTTP/1.1"
.
.
""ClientProcessRequest: Invalid Request"
[Code].....
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Jul 19, 2011
My PC is part of a LAN so while configuring eth0, we specify the Gateway to access all other resources in the network. The PC successfully access Internet through a proxy server configured in Mozilla(manual proxy config) but the update option or the Synaptic Pkg mngr are not able to access internet anyway. I have tried the option "Apply System Wide" in "Network Proxy" but no progress so far.
I also tried to forward all request coming for udp/tcp on port 80 to the proxyserver on a specific port, but with no success. Also I can't ping any website from terminal, reiterating the fact that I can access internet in firefox through the proxy on a specific port.
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Apr 17, 2011
How do you set up a linux workstation to act as a gateway for all other PC's in the LAN giving them internal IP's using DHCP, but which also forces all access to the internet to go through a proxy running inside the same linux workstation at 127.0.0.1:9666?the proxy is provided by ultrasurf and run using wine and we do not want to set applications one by one to use a proxy - it must be an automatic effect.
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Jan 8, 2010
is it possible to see the router traffic using a remote system? can those packet headers b modified for marking purpose?
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Sep 18, 2010
Problem Summary: - Linksys WRT54G dd-wrt NOT able to route when in Router mode
Env:
- Linksys WRT54G running dd-wrt v24 firmware
- LAN Subnet: 10.0.0.0/8
- WAN Subnet: 172.16.0.0/16
- Linux FC13 configured as a IPv4 router
- LAN 172.16.0.0/16
- WAN ISP/Public IP
[Code]...
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Jul 8, 2011
I have a weird issue with source routing on a linux box.The plan goes like this:I have 2 internet providers at my office and i want to use a single router to route them both ( i don't need load balancing or failover). I just want access to either provider based on the ip i use on my pc. The first provider, let's call it RDS, is simple: i've got an RDS_IP, RDS_MASK and RDS_GW.The second provider is complicated, we'll call it INES. I have a INES_IP, INES_MASK, INES_GW and they also gave me a subnet of public ip's: ILAN_NET which i have to route myself through INES_IP.I also have a third nic with an local ip: LAN_NET and an alias for the INES subnet: ILAN_NETthe router has dhcp enabled, giving by default ip's from LAN_NET and using the default gw, RDSI have snat for the LAN_NET to go through RDS.
If i enter an ip from the ILAN_NET, instead of routing in through the INES_GW, it also goes through RDS_GW.the routing i've used for about 5 months has worked perfectly untill one day, when it just stopped. this is my setup:ip route add $RDS_MASK dev $RDS_IF src $RDS_IP table rdsip route add default via $RDS_GW table rdsip route add $INES_MASK dev $INES_IF src $INES_IP table inesip route add default via $INES_GW table inesip route add default via $RDS_GWip rule add from $RDS_IP table rdsip rule add from $INES_IP table inesip route add $LAN_NET dev $LAN_IF table rdsip route add 127.0.0.0/8 dev lo table rdsip route add $ILAN_NET dev $ILAN_IF table inesip route add 127.0.0.0/8 dev lo table ineswhat puzzles me the most is that this setup has worked, and now it doesn't .... without any changes on the router.I've tried everything save for a format/reinstall.
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Jul 27, 2010
I have a desktop, a laptop, & a wireless router. The router, unfortunately, doesn't support dd-wrt, tomato, etc firmware, but I would still like to prioritize voip/web browsing over bulk Internet traffic. I hope I can offload the router's missing QoS to my desktop.
Is it possible to have the laptop's connection go from the wall to the router to the desktop, where the desktop could perform the QoS of tomato, then continue on to the laptop? I'm a bit of a noob to networking (subnets?) but do well enough following good instructions.
As for the program that would do the QoS... Don't some Linux machines basically work as super-powered routers for businesses? So there must be some package but couldn't find one. The closest I got was wondershaper but it only shapes traffic for the computer on which it's installed; it might form part of the solution but falls short on its own. other devices should be able to access the Internet normally if the desktop is turned off, & work with other devices like a (jailbroken) iPod Touch.
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Jun 10, 2009
I am looking for a solution for our LAN traffic monitoring and would like to use some opensource linux application. I have a linux box with two NIC cards and what I thought is the following: Our setup is as follows. Internet comes in through the router and into the firewall. From the firewall it goes into our switch and distributed among the workstations.
I have no access to the router or the firewall as they are centrally configured. I would like to place a device into the loop through which I could monitor the LAN traffic.
Can I put a linux box between the firewall and the switch and have all packets going through registered and logged? I have a proxy server (non transparent) and that captures some but not all. I would like to get all packets registered without interfering with the LAN etc.
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Apr 6, 2011
I need to redirect all http/https/ftp traffic through the remote proxy, but when I changes connection settings in browser or in System->Preferences->Network Proxy it doesn't work well: instead of getting page content browser asks for saving some short (8 bytes) file with the same content for all requested pages. It happens in Chrome/Opera/Firefox. This proxy requires authorization and works on computer with Windos XP. It worked well when I was using Windows 7 and Proxifier, now I have Ubuntu 9.10 with all available updates.
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Mar 25, 2010
I am new to iptables. We have two Squid proxy servers running in "non-transparent mode" (172.16.0.1 and 172.16.0.2). Currently users have to configure the proxy server they want to use by configuring them in their browsers. Recently I saw an example for redirecting web traffic to a single transparent proxy server.
-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
-A PREROUTING -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 3128
Can anyone modify this rule to accommodate my current setup of two proxy servers running in non-transparent mode. i.e Redirect web traffic to the 172.16.0.1-172.16.0.2 ip range.
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May 21, 2011
I'm trying to setup a Centos 5.6 Squid Proxy Server with Content Filtering & Antivirus Scanning Incoming HTTP Traffic from the Internet
I then proceeded to setup an configure the Proxy Server, i was able to test and confirm that Squid and Dansguardian Content Filter is working, however i dont know if Clamav is scanning HTTP traffic before it hits the client/server. Is there a way i can check if the Antivirus scanning is working.. is there some log file or real world test i can i can do to confirm that Clamav is scanning incoming traffic or even blocking potential viruses ??
Anyone who has squid proxy server with Clamav configured and its working can share there settings/setup with me and how they tested it ??
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Aug 30, 2010
today I tried to configure a network route to a host for testing my network interface. Code: route add 192.168.1.15 eth0 As I have to eth interfaces and both interface got their IP from DHCP (192.168.1.11 and 192.168.1.12) and are in the same subnet, I shut the other interface down:
Code: ifconfig eth1 down Then I tried to test the interface by doing a ping to 192.168.1.15.
Problem: When I unplug the cable from eth0 (and eth1 is still plugged) the ping still works. Somehow my linux (it's debian) powers up again eth0 and pings over this port.
How can I stop my linux doing this. I just want to have the route added only on the one interface - not the other. Is it maybe some case of a default-gateway?
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Mar 8, 2010
I have set up many Dansguardian/Squid proxy servers. All of them have been on a network where I could use Microsoft Group Policies to force the proxy settings on each machine. The entire setup is quite easy, surprisingly robust, and reliable as hell.
My Dentist talked to me today and asked for something different. He wants to set his office up as a wireless hot spot for his patrons, and he wants their surfing directed through a proxy server. I plan on putting them on a completely different subnet and independent router. Now, since I won't have the convenience of GP I'm wondering if there is a way to force all internal Port 80 traffic through the Proxy server but obviously not the Proxy itself. I would like to use the router to do this and not the Linux box. Is there a low cost home router like Linksys or Netgear that will do this?
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Aug 22, 2010
I've currently got a Xen box with 3 Virtual machines on it, in a routed setup. I'd like to put them all on a private internal network as well, which I'm assuming I'd do with a dummy network card and a xen bridge, but I can't find any information about setting up the xen Bridging setup on top of the existing network-route instlal.
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Apr 24, 2010
I'm having trouble getting my network set up the way that I want it/had it. You see, when I first set up my network, I just had my cable modem going directly to my standard wired router (A D-Link DI-604), which had DHCP,and was connected to all of the computers on my network. I had one switch hooked up to one of the ports of the router, but this was a regular switch, and it would not try to assign IP addresses, it would just pass through the DHCP info as I wanted.
Now however, my network setup has changed. My room mate and I both got laptops, and we decided that we wanted to have wireless access so we didn't have to constantly plug in to the router.
Now my network is set up like this: The modem is hooked up to the router(DI-604), which is hooked up on the LAN side to our computers, our switch (which is hooked up to 3 more computers), and to a wireless router card (A Gigabyte GN-BC01).
The wireless router card has two jacks for ethernet. One for WAN, and one for LAN. The LAN side we have plugged only into the computer in which the card is installed.
Now the problem is this: The wireless router card comes with DHCP by default, and it's assigning addresses to the laptops and to the computer hat it's in, and worse, the IP addresses are on a different subnet than that of the main dlink router. The Main (dlink) router assigns addresses from 192.168.0.1 (itself) to 192.168.0.254, while the wireless router card assigns addresses from 192.168.1.1 to 192.168.1.254 (itself).
Because of this, I cannot access services on the wireless network from my wired network or vice versa. The first thing I tried was setting the card to assign addresses from 192.168.0.12 to 192.168.0.253, however it just said "internal error" when I tried to do this. I decided that this may be because it sees that it was being assigned an address on it's WAN side on the same subnet. So the next thing I tried was disabling DHCP and setting the "LAN IP Address" to 192.168.0.12, hoping that the DHCP would just go through the card, like a switch. I would have set the LAN IP address to be assigned by DHCP, but this was not an option, so I decided that'd be the best thing to set it to.
Once again however, setting the LAN ip address to an address on the same subnet as that of the IP assigned to it's WAN side caused it to report an "internal error". I verified that this was the issue by setting the LAN address to several other private IP addresses to test (I.E. 10.0.0.1, 192.168.3.1, 192.168.5.12).
My question then really is: How do I set up both routers so that I can access services and computers from each network from the other network. Should I set them with different subnets and set the gateway on the wireless network to the main router? To the wireless router card? Should I put them on the same subnet? Will it know how to communicate?
Here is a link to (picture) my network diagram. Network Diagram
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Mar 22, 2011
I am running Ubuntu Server 10.10. I have installed OpenVPN using this guide I have set up everything correctly as this guide says, but I am having problems with the config file. I want to securely route all traffic on the client to the server, how ever the server will not start. My config is below:
Quote:
#################################################
# Sample OpenVPN 2.0 config file for #
# multi-client server. #
# #
# This file is for the server side #
[Code]......
The servers ip is 10.0.0.65 and I want to assign the clients the ip range of 10.0.0.200 to 10.0.0.20 When I try to start the server I get the message Fail.
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