In order to use a linux host as a router/firewall, you first need to enable IP Forwarding:
# sysctl -w net.ipv4.ip_forward=1To make the change permanent insert or edit the following line in edit /etc/sysctl.conf:
net.ipv4.ip_forward = 1[Apache] Basic tips for security
The Debian’s default apache.conf is quite good, but there is some parameters i like to redefine in order to improve security a little:
Disable apache signature
ServerSignature Off
ServerTokens Prod
Disable HTTP trace request
TraceEnable OffDisable Unnecessary Modules
Look for lines that begin with LoadModule. To disable the module just comment them. Here are some modules that are typically enabled by default but often not needed: mod_imap, mod_include, mod_info, mod_userdir, mod_status, mod_cgi, mod_autoindex.