I'm back to square one then, and it looks like there is no way to tell Squid to use the same connecting ip for the outgoing ip, which is what I need.
On Thu, Oct 5, 2017 at 3:49 AM, Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote:
On 05/10/17 15:01, xpro6000 wrote:
I'm trying to setup tproxy with Squid 3.5 for the purpose of having the same outgoing ip as the connecting ip. (I have thousands of IPs and I can not add them one by one)
I started with a fresh install of Debian 9, installed Squid by
apt install squid
then I added
http_port 3129 tproxy
to squid.conf
I then ran the following commands for iptables
iptables -t mangle -N DIVERT
iptables -t mangle -A DIVERT -j MARK --set-mark 1
iptables -t mangle -A DIVERT -j ACCEPT
iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TPROXY --tproxy-mark 0x1/0x1 --on-port 3129
I can use the proxy with no problems on port 3128, but on Firefox I get a message "The proxy server is refusing connections" when I set the proxy to port 3129. Did I miss any steps or am I doing something wrong?
You missed the fact that TPROXY is an MITM operation. You *cannot* setup the browser to use the proxy directly to its tproxy port. You have to route the packets to the proxy machine without any explicit browser or client configuration.
Only the Squid machine bits (and thus behaviour) are different with TPROXY vs NAT interception.
...
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
http_access allow localhost
http_access allow all
Do not do "allow all" like this. Setup the localnet ACL to your LAN range(s) properly and only allow those clients through the proxy.
Then you can use the recommended default:
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access deny manager
http_access allow localnet
http_access deny all
Amos
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