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Recipe 2.8 Blocking Access to a Remote Host
2.8.1 Problem
You want to block outgoing traffic to a
particular host.
2.8.2 Solution
To block all access:For
iptables:
# iptables -A OUTPUT -d remote_IP_address -j REJECT
For
ipchains:
# ipchains -A output -d remote_IP_address -j REJECT
To block a particular service, such as a remote
web site:For iptables:
# iptables -A OUTPUT -p tcp -d remote_IP_address --dport www -j REJECT
For ipchains:
# ipchains -A output -p tcp -d remote_IP_address --dport www -j REJECT
2.8.3 Discussion
Perhaps you've discovered that a particular web site
has malicious content on it, such as a trojan horse. This recipe will
prevent all of your users from accessing that site. (We
don't consider
"redirector" web sites, such
as http://www.anonymizer.com,
which would get around this restriction.)
2.8.4 See Also
iptables(8), ipchains(8).
