Ubuntu Networking :: Use External Transparent Proxy For A Single Host?
Jul 24, 2010
I have searched for this quite a bit but my lack of knowledge of IPTables makes me doubt whether I have found a solution or not. I have very light experience with IPTables as well.So I thought I'd ask here.Basically, what I am trying to do is use an external transparent proxy for only one of the hosts on my internal network. For example, for an internal host of 192.168.1.8, I want to send all internet requests for ANY port to a proxy server out in the internet at 238.34.232.7 / port: 8080. All other hosts would use the internet without using any proxy server.
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Jul 24, 2010
what I am trying to do is use an external transparent proxy for only one of the hosts on my internal network. For example, for an internal host of 192.168.1.8, I want to send all internet requests for ANY port to a proxy server out in the internet at 238.34.232.7 / port: 8080. All other hosts would use the internet without using any proxy server. Is IPTables the way to set this up or is there an easier option?
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Feb 21, 2011
trying to configure a transparent proxy with squid (and filter content with dansguardian) in Debian/Ubuntu. If i configure firefox to use it, it runs ok. I had seen a lot of iptables rules to use fowarding proxy to a lan, but i would like to use squid and dansguardin in a single pc that run them and filter web content.
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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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Aug 17, 2010
I can ping a host on my LAN successfully, but I cannot ping [URL]... for example. I have disabled the firewall and set http_proxy and can browse the internet with "Use system proxy settings" checked in Firefox. I am unable to update with yum either, but I am not sure if this is a side effect or not. I have run a trace on my ip address as I am browsing the internet and I can see the sites I am visiting on our web appliance. However, if I try to ping or update no requests are hitting the proxy so I don't think that is the issue.
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Jul 30, 2010
I have a problem in Eclipse for accessing update sites (for plugins). I am behind a NTLM proxy. Strangely, this proxy asks for a password while in Linux but not when in Windows�
To get around this annoying password issue, I already setup a working cntlmd proxy. I can use this proxy for mounting a remote DavFS2 share, for example. But the issue I have with Eclipse seems to involve proxy configuration. So I decided a transparent proxy could solve this issue. I installed tinyproxy on top of cntlmd, and added the following rule to the firewall:
Code:
iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to 8888
Now, I can configure Firefox for direct access to the Internet, and display a web site only if I give this web site's IP instead of its name! I surmise that it's because when configured for direct access, Firefox performs DNS lookups using the local (intranet) DNS, instead of squeezing its lookups through the proxy and accessing a broader DNS (I wonder which). How can I make all DNS lookups go transparently through the transparent proxy?
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Mar 23, 2010
I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use
Code:
iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234 to redirect to my proxy that is listening on port 1234. The proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy and if it sent out to port 80 it would just be a infinite loop) so I want to do something like
Code:
iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80
The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip?
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Feb 9, 2010
I'm trying to setup a linux box with 3 NICs (2 WAN links and 1 LAN). All http traffic (port 80) should go to WAN 1 via squid proxy and the rest to WAN 2. I already setup MASQUERADING in iptables and I already configured port 80 to redirect to port 3128 for squid. My default gateway is WAN 2. But the problem is squid uses the default gateway - WAN2. setting up the iptables / routing for squid to use WAN 1?
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Sep 28, 2009
I am trying to set up squid to make switching proxies easier. I have a laptop which I use at work and at home. At work, I need to connect to the internet via a authenticated proxy. At home, I connect directly to via mobile broadband. So I end up switching proxy settings twice daily, which is just irritating! To solve this I want to set up a system whereby I never have to worry about a proxy - my browser sees a direct internet connection which squid (on my computer) intercepts and forwards either to the mobile broadband connection or to the work proxy (along with the required authentication) depending on which is available. I've read various articles on how to do clever things with iptables and squid, but I don't understand enough of the networking jargon or concepts to know when I need to change to make it work in my situation, or if it is even possible.
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May 6, 2011
I have set up squid3 and dhcp server on my Ubuntu 10.04 box with IP address of 192.168.0.160. Single network card.Squid runs on port 3148. Everything works fine for the users provided that I set up the proxy details manually on each client pc.I want to set up the Squid to run as a transparent proxy and after reading around I have done the following.In the Squid3 conf file I have entered http_port 3148 transparent.Dropping to Root ( sudo -i )However the transparent proxy does not work and if I enter iptables -L I can see that the rule above has not been retained. The default rules in iptables only show up.
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Nov 26, 2009
I'm looking to setup a transparent proxy, which (if I understand correctly) will allow me to monitor/control http traffic on my home lan with the use a log analyser.I'm planning on following this guide Yes... I'm cheap and don't wanna buy another NIC.My question: How does this all work? I get that http traffic goes to my server first, and then to the destination address, but how? What is stopping the other computers on my network from going straight to my router?Is my interpretation of a transparent proxy correct?
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Mar 11, 2010
I have big problem with correct settings of iptables as a router. My network topology (UTM Hardware router) 192.168.1.1--->eth0 192.168.1.2(centos with apache ftp and transparent squid 8080)--->eth1 192.168.0.1(LAN with dhcp)
eth0=WAN 192.168.1.2
eth1=LAN 192.168.0.1
I have problem with hanging connections through squid which are very slow or connection failed. Sometimes i received DNS timeout error from squid stable 2.6 21
[Code]...
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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 29, 2011
I've problem with configuring transparent proxy on Fedora v13 was checking with several examples, last one from here on router (cisco 1812) everything seems ok, think there is a problem with Linux
Squid machine and router 'see each other'
Code:
While try to open web page, on GRE there is:
Code:
But when want to see what hapenning in tunnel between router and squid - there nothing...squid configuration is ok - was checking before try to make it transparent.
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Jun 11, 2009
Need a bit of help from the linux community. Lately, I have been trying to configure squid as transparent proxy on my server running on RHEL5. I had gone through few articles on web abt how to configure it and configured squid accordingly adding http_accel_xyz settings and then configuring the NAT using iptables. But while restarting squid there were warnings about "unrecognized: http_accel_..." in parseConfigFile.What I could get from these is that probably I need to recompile squid adding transparent proxy support. I downloaded the new squid 3.0 and tried to compile it.But unfortunately, the 'make' command fails giving library errors.I have been stuck with t now as the new squid does not compile and old one does not support the transparent mode.could compile the new one and what supporting libraries do I need to compile it successfully and also from where can
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Nov 10, 2010
I need to set up an ip table and a transparent squid proxy as followed: I have 3 machine: Machine 1 works as a squid proxy. It has 2 interface eth1 and eth2.
eth1: 192.168.99.2 (Connect to eth1 of machine 2)
eth2: 192.168.98.2 (Connect to eth1 of machine 3)
machine 2 works as a webserver
eth1: 192.168.99.4
machine 3 works as a web client.
eth1: 192.168.98.4
my responsibility is to send all tcp traffic from machine 3 at port 80 to my squid proxy. In order to fulfill the tasks, I have edited the squid.conf as followed: Code: http_access allow localnet http_access allow localhost and in machine 1, I tried 2 ip tables command: Code: iptables -t nat -A PREROUTING -i eth2 -p tcp --dport 80 -j DNAT --to 192.168.99.2:80 iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 80 I don't know if it is right or wrong.
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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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Dec 12, 2010
My skill in fedora linux is all acquired by reading online and trial and error. I manage to set up my squid 3.0 proxy server in fedora 11. It is working smoothly as I wanted it to be. I have one client who is running bittorrent that drags all the bandwidth of our network.The problem is I cant make my server work tranparently. I want to make transparent proxy so that it can support my wireless router and I want to control the bandwidth to a fair level for everyone without them knowing.
Please somebody help me configure iptables in step by step, specifically in fedora 11. And all other necessary configuration needed to run my transparent squid 3.0 proxy in fedora 11.I know there's a lot of Linux Genius here that can help. Please help me I needed it badly.
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May 1, 2009
I am using Fedora Core 9.0 and Squid Cache: Version 3.0.STABLE2 .
Now i am trying to use the squid as a proxy server but its not working its giving error like this ...
While trying to retrieve the URL: /
The following error was encountered:
Invalid URL Some aspect of the requested URL is incorrect.
Possible problems:
Here is my squid.conf
While trying to retrieve the URL: /
I have also try to forward the traffic coming on 3128 to 80 but its not working:
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Jan 12, 2011
I setup squid with transparent proxy and its working, however, when I reboot the server, the proxy server doesnt work unless I run the following.
Code: # squid server IP
SQUID_SERVER="192.168.1.1"
# Interface connected to Internet
INTERNET="eth0"
# Interface connected to LAN
LAN_IN="eth1"
# Squid port
SQUID_PORT="3128"
[Code]...
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Jan 26, 2010
Here is my network diagram ADSL router----firewall--LAN inside the LAN my squid is running. currently all users are working with out proxy server. I installed the proxy server inside the LAN. now all users can access web browsing ,but no other ports are working , like POP3, smtp, then some other TCP port based applications are not working. My firewall ( juniper) is created and tested the rules to allow the POP3 and smtp and selected poprts which is working , but I redirected through squid proxy server the clients are not able to access. where do I have to create rules?
** in squid proxy( i already did in safe port list stillnot working)
** IP tables?
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Feb 23, 2011
I am trying to set up my squid3 proxy as a transparent proxy - right now, I have to manually configure browsers to access via proxy. I understand that I have to put some rules into Iptables and also some further directives in the squid.conf.
I have a couple of specific questions. The proxy server is running on a Ubuntu 10.04 workstation and this machine also acts as a dhcp server for the network. I have just one subnet , namely 192.168.0.1-254 There is only 1 network card. Is it much easier to put in a second network card or is it just as easy to configure the existing lan card as a dual IP?
Is it necessary to configure these 2 IP's ( whether they are via 2 lan cards or dual IP on single card ) to be on different subnets. i.e ETH0 192.168.0.1 and ETH1 192.168.1.1 or is ok to have something like ETH0 192.168.0.1 and ETH1 192.168.0.254 ( where ETH0 is the one facing the LAN and ETH1 points to the modem router / switch i.e The Internet ) Where specifically do I save the Iptables rule configuration file and what must I call it ?
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Apr 11, 2011
there's a way to locally proxy or spoof just one web page. That is, use tsocks or hosts or something so that when I run an application that requests [URL], it receives /home/user/myversion.html, but for any other address it gets the normal page. Seems simple enough, if a little unusual... (I'm trying to work around a wget bug.)
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Feb 19, 2010
I am running several servers with multiple LAN ports. Two of the machines can communicate via two separate subnets to control bandwidth issues.
Machine 1: 10.0.0.1 (w/ additional alias 12.0.0.1)
192.168.1.1
Machine 2: 10.0.0.2
192.168.1.2
I see three separate intermittent symptoms on the 10.0.0.0 network.
1) Both machines will cut off in the middle of the data transfer (rsync) if it takes too long.
2) Both machines will claim that the RSA key host has changed on the other...this will happen every few minutes.
3) Both machines will, at times, disallow login from the other...ssh prompts for password but will not accept the password.
Performing any operation between the same machines via the 192.168.1.0 subnet has no issue (as of yet).From what I can see, the routing tables are set correctly. Machines were exact clones of each other. Machine 2 is a recently rebuilt machine with a fresh suse11 distro install. Symptoms on Machine 2 appeared immediately. I had this exact setup but reversed ip addresses before Machine 2 burned out without issue. All networks but the 12.0.0.1 are internal and there hasn't been any indication of attack.At times, running ssh-keygen -R <ipaddress> will fix issues 1-3, other times only 1-2.
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Jan 25, 2011
I have a slave node uploading all kinds of backups to my server in the internet. Now I would like to display the actual upload and download rate to this server (not the entire nic-traffic, any protocol) in a small php-page for easy monitoring.I had a look at quite some monitoring tools and the one which kind of offers what I am looking for is iftop with a filter on the IP of my server. As I would like to periodically update a file with the actual rates, an interactive program won't do. A possibility would be to filter the packages myself using but this seems to be quite a long shot.The optimal solution would be a program or script printing out the actual upload to a host specified in the options to STDOUT
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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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Aug 11, 2010
I'm mon webmaster/developer and I'm new in Linux. Our office suddenly needs to setup a proxy server. Ubuntu Squid proxy server immediately came as an option for us. The question is: does transparent squid proxy configuration using Ubuntu will have no problem with computers running on Windows OS?
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Apr 7, 2009
I am trying to configure squid with Fedora 10 to use it as a transparent proxy webcache.Is there any good tutorial you would recommend to a novice?
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Apr 6, 2011
I have recently installed tor + vidalia + privoxy on my maverick system. What I was hoping to do was set up transparent routing through tor using the instructions here - [URL] But Ive had no luck with any of the examples given. When Vidalia tries to connect it stops at the point of generating a tor circuit and never gets any further.
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Mar 2, 2010
I am running Jaunty 9.0.4. I have go through a proxy to get out to the net. It was working. Sometime yesterday it was unable to resolve the proxy server. Can't even ping it. Other computers can. I even switch cables to no avail. What could block the proxy server? I can't even ping google.com Was it something I installed through add/remove software? Has anyone seen something like this before and even better has a solution or can offer a way to troubleshoot this? I can ping myself and the default gateway server.
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