The never_direct directive allows us to use an ACL where requests should NEVER be forwarded directly to origin servers. In this case we only want to forward requests out to the parent Squid proxy server at if the requests are NOT for *., “!” specifies not. Next we specify the parent Squid proxy server by using cache_peer, in this case we are using on port 3128 as our default parent proxy server.įollowing this we use cache_peer_domain to limit the domains that we will request from the parent proxy server. Ĭache_peer parent 3128 0 no-query defaultĬache_peer_domain !.įirstly we are specifying an access control list (ACL) called local-servers which is defined as anything under the *. domain, which will be all fully qualified domain names (FQDN) of our services in the internal network. Internal Child Squid Proxy acl local-servers dstdomain.
#Squid squidman proxy full
We’ll be covering the specific configuration required for the forwarding to work as described rather than discussing the full Squid configuration. Now let’s take a look at the configuration on our Squid proxy servers to make this happen. So basically anything request that is not destined for the network should be forwarded to the parent Squid proxy server, from there the requests can either make their way to services in DMZ network or out to the Internet as required.
#Squid squidman proxy Pc
If the client PC is accessing something within *. we do not want the internal Squid proxy server to forward the requests to the parent/external Squid proxy server in as it will not know what to do with these requests and they will fail. The parent Squid proxy is located in the external network and can connect to the Internet. Requests to or the Internet will be forwarded from to the what is known as a parent Squid proxy server () which will then pass the requests to a server within the external network if this is what has been requested, otherwise will forward the request out to the Internet.
We are going to do this by sending the request to a Squid proxy server that is located within the internal network () which will forward requests destined to the same local network directly where they need to go. The below diagram outlines the path a request by the client PC would take in order to reach a web site on the Internet.įrom our client PC in the internal network we want to be able to access other services within the internal network, services within the external DMZ network and services on the Internet. The services on the internal network are accessible on the domain while the services on the external network are accessible on the domain. There are servers running within both the internal and external networks which must be accessed from within the internal network by a client PC. The external network on the other hand is able to connect out to the Internet via a Squid proxy server. The internal network has no direct access to the Internet, but it can connect to the external network. In this scenario we have two separate networks, an internal network and external network. The configuration will allow us to select which domains should or should not be forwarded on to the next proxy server, allowing requests that are destined for domains within the internal network to not be forwarded to the next Squid proxy, while other requests to the DMZ network or the Internet will be forwarded to the next proxy.īefore we get stuck into the configuration we’ll take a quick look at the overall environment in this particular situation and explain why this is something that you may want to do. Here we’re going to take a look at configuring two Squid proxy servers to forward requests from an internal network with no connectivity to the Internet out to a DMZ network and then onto the Internet if required.
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