I have installed CentOS 6.5
my default gateway in my infrastructure is 192.168.3.1 (which is firewall IP)
I wanted to change it to the CentOS server IP So that I can limit the usage of the Internet and monitor the Websites used in my network.
I dont want to setup proxy server setting in browser
Appreciate all :)
You have two options:
First option use iptables firewall and redirect trafic from port 80 to port 3128.
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 3128
Second option configure squid to lisaning port 80 instead 3128
By default, Squid listens on port 3128. If you would like to use a different port, modify
/etc/squid/squid.conf
http_port 80
save
service squid restart
Related
I am trying to setup a public squid proxy that routes it's traffic via a VPN server elsewhere in the world. It's running inside a docker container on a VPS host.
Using the default settings with push gateway, I can access the squidproxy on the VPS itself and it does route it's traffic via the vpn.
However, no external IPs can access the squid proxy.
I do have docker forwarding the port 3128:3128.
It is something to do with the OpenVPN routes that are created (as the Squid proxy is accessible until OpenVPN starts)
I found it is this route that seems to "block" my external traffic.
128.0.0.0/1 via 10.91.10.5 dev tun0
(10.91.10.5 is the gateway of the VPN)
If I remove it I can access squid again but then outgoing requests don't use the VPN.
I can make my external IP work by explicitly adding it like so
ip route add 203.X.X.X via 172.18.0.1 dev eth0
(172.18.0.1 is the docker gateway)
But I need it to work with any external IPs.
I have tried ip route add 0.0.0.0 via 172.18.0.1 dev eth0.
But this doesn't work as 128.0.0.0/1 is more specific so matches first.
In conclusion
1) Need any IP to access the SquidProxy (port 3128)
2) Need all outgoing SquidProxy requests (80,443) to go via the VPN
Any help would be greatly appreciated!
UPDATE:
So I have this working
1) Start OpenVPN with the below command
openvpn --route-nopull --script-security 2 --up /etc/openvpn/up.sh
This disables it from setting up the VPN routes. So all traffic in and out is using the default route not via VPN
2) In the up.sh, I run the below commands
#!/bin/sh
/sbin/ip route add 0.0.0.0/0 dev $1 table 100
/sbin/ip rule add from all fwmark 1 table 100
/sbin/iptables -A OUTPUT -t mangle -p tcp -m multiport --dports 80,443 -j MARK --set-mark 1
/sbin/iptables -t nat -A POSTROUTING -o $1 -j MASQUERADE
I have then setup Squid to only allow ports 80 & 443. Docker has port 3128 open for access to the container.
I also needed to use --sysctl net.ipv4.conf.all.rp_filter=0 in the docker run command.
new to setting up a load balancer:
I am working with the google compute engine.
Set up 3 servers running on 3 different ports: 5010, 5011 and 5012.
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 8080 -j REDIRECT --to-port 5010/11/12.. on each specific server
set up a health check to port 8080 . let's call it example-health-check
set up a target pool that contains the health check and all the 3 instances. let's call it example-target-pool
Set up a forwarding rule with tcp:5010-5012 and linked it target pool to the example-target-pool
when I go to the lb ip in each one of the ports the connection is very weird. it works but very slow in most of the requests but once in a while a request is very fast to pass..
any ideas ?
I have 3 virtual machines. I have Squid proxy installed on one of them which functions as a router. I need to configure it to accept HTTP requests from only one of the other 2 machines(IP - 172.16.2.2). The change I made to the squid.conf file is:
http_port 172.16.2.2:3128
I then changed the firewall rule in the route machine so that it redirects traffic from 172.16.2.2 bound for 80 (HTTP port number) to the default squid port 3128. The command is given below:
sudo iptables -A PREROUTING -t nat -i eth1 -p tcp --dport 80 -j REDIRECT --to-port 3128
Machine 172.16.2.2 is connected to the router on eth1. However, whenn I am making sending a HTTP request from 172.16.2.2, I get a 403 Forbidden error. It says:
X-Squid-Error: ERR_ACCESS_DENIED 0
I can't understand it. Please help.
(edited for style)
http_port is used to configure where squid is listening for request, so if you include an ip address, it should be configured in the same machine that is listening. So, in your case 172.16.2.2 (the "other" machine) is not a correct configuration.
I have been trying to deploy a home-made server. My network consists of a router (Comtrend brand) and 2 pcs (A server laptop connected to eh0 and a netbook connected to WiFi).
The problem is that everytime I try to access to my external public IP I'm redirected to my routers internet address (192.168.1.1).
But if I access with directly with 192.168.1.132 I can see all my services published and use all the protocols. (http, ssh, etc).
What could I do? Is it a problem in the server configuration?
Configuration:
My server's ip is always 192.168.1.132
My laptop receives diferent internal ips but this is not important
My router has a dynamic ip. Let's say X.X.X.X.
Things I've already tried:
1.
I have opened ports in my router. Right now I have:
http 80 80 TCP 80 80 **192.168.1.132** ppp0.1
ssh 22 22 TCP 22 22 192.168.1.132 ppp0.1
2.
I tried with IPTABLES by adding the two next rules:
iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j DNAT --to 192.168.1.132:80
iptables -A FORWARD -p tcp -i eth0 -d 192.168.1.132 --dport 80 -j ACCEPT
Then:
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -F
You may need to change the router's http management port to some port other than port 80 (like, port 8080 for example), in order to get the port forwarding to work, so that it forwards http requests on port 80 to your server at 192.168.1.132.
I have created a J2EE application that runs on GlassFish, HTTPS enabled. When the user typed http: //www.mydomain.com:8080/app, it will be redirected to https: //www.mydomain.com:8181/app/login.
However, when I see in some of the websites, it can actually redirected to something like https: //www.mydomain.com/app/login (without the HTTPS port 8181). Does this means that the server is running both HTTP and HTTPS on port 80?
How to configure this on GlassFish 3.1?
Non-root user should not use ports below 1024.
It is better to do port forwarding from 80 to 8080 and 443 (https default) to 8181.
Execute this as root:
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -t nat -A PREROUTING -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8181
Need to make this permanent:
iptables-save -c > /etc/iptables.rules
iptables-restore < /etc/iptables.rules
and call during startup, vi /etc/network/if-pre-up.d/iptablesload
#!/bin/sh
iptables-restore < /etc/iptables.rules
exit 0
You can also configure it in the admin web gui under:
Configuration -> Server Config -> Network Config -> Network Listeners
Just to give out more details on alexblum's answer, when you login into the Glassfish Admin panel, go to Configurations -> server-config -> Network Listeners in Network Config.
Then click on New to add a new listener.
On the new listener page, just select 80 as your port and put 0.0.0.0 as your IP.
Select tcp as your Transport and use http-thread-pool as your Thread Pool
Save and Restart your Glassfish instance.
Thats what worked for me anyways.
The default port for HTTP is 80. When you access a URL: http://www.example.com/ you are connecting to www.example.com:80.
The default port for HTTPS is 443. When you access a URL: https://www.example.com/ you are connecting to www.example.com:443.
(See List of port numbers)
(See configuration of GlassFish to use other ports)