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The comments above show the syntax to follow. First, enter the IP address and the
netmask of the internal networks accessing the proxy firewall. Second, enter the IP
address and the netmask to which these clients send their requests. In the case of Web
browsers, specify the networks 0/0, a wild card that means "to everywhere." After
that, enter the original port to which these requests are sent and, finally, the port to
which all these requests are redirected. Because Squid supports protocols other than
HTTP, redirect requests from other ports to the proxy, such as FTP (port 21), HTTPS,
or SSL (port 443). In this example, Web services (port 80) are redirected to the proxy
port (port 3128). If there are more networks or services to add, they must be separated
by a blank space in the respective entry.
FW_REDIRECT_TCP="192.168.0.0/16,0/0,80,3128 192.168.0.0/16,0/0,21,3128"
FW_REDIRECT_UDP="192.168.0.0/16,0/0,80,3128 192.168.0.0/16,0/0,21,3128"
To start the firewall and the new configuration with it, change an entry in the /etc/
sysconfig/SuSEfirewall2 file. The entry START_FW must be set to "yes".
Start Squid as shown in
Section 42.3, "Starting Squid"
(page 795). To check if everything
is working properly, check the Squid logs in /var/log/squid/access.log.
To verify that all ports are correctly configured, perform a port scan on the machine
from any computer outside your network. Only the Web services (port 80) should be
open. To scan the ports with nmap, the command syntax is nmap -O IP_address.
42.6 cachemgr.cgi
The cache manager (cachemgr.cgi) is a CGI utility for displaying statistics about the
memory usage of a running Squid process. It is also a more convenient way to manage
the cache and view statistics without logging the server.
42.6.1 Setup
First, a running Web server on your system is required. Configure Apache as described
in
Chapter 41, The Apache HTTP Server
(page 751). To check if Apache is already
running, as root enter the command rcapache status. If a message like this ap-
pears:
Checking for service httpd: OK
Server uptime: 1 day 18 hours 29 minutes 39 seconds
The Proxy Server Squid
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Troubleshooting
