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--- networking:firewall:block_host [2013/07/01 16:55]
gcooper
+++ networking:firewall:block_host [2018/01/15 12:13] (current)
gcooper
@@ Line 1: / Line 1: @@
 ====== Block Traffic From a Particular Host ======
-:!: You can use DROP or REJECT depending on what you want the blocked host to know.
+See also **[[networking:router:mikrotik_manual_blacklist|Manually Add and Remove IP Addresses to a Mikrotik Blacklist]]**
+:!: You can use ''DROP'' or ''REJECT'' depending on what you want the blocked host to know.
 <file>
-iptables -I INPUT -s 66.184.141.132 -j DROP
+iptables -I INPUT -s nnn.nnn.nnn.nnn -j DROP
 </file>
@@ Line 10: / Line 12: @@
 <file>
-iptables -D INPUT -s 66.184.141.132 -j DROP
+iptables -D INPUT -s nnn.nnn.nnn.nnn -j DROP
 </file>
@@ Line 22: / Line 24: @@
 <file>
-for ip in `grep Itau.com.br /var/log/httpd/error_log|egrep -o "client [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+"|sort |uniq|cut -f 2 -d " "`; do iptables -I INPUT -s $ip -j DROP; done
+for ip in `grep spammer.com.br /var/log/httpd/error_log|egrep -o "client [0-9]+\.[0-9]+\.[0-9]+\.[0-9]+"|sort |uniq|cut -f 2 -d " "`; do iptables -I INPUT -s $ip -j DROP; done
+</file>
+===== Block Hosts by User Agent String =====
+http://en.linuxreviews.org/HOWTO_stop_automated_spam-bots_using_.htaccess
+<file>
+vim .htaccess
+</file>
+<file>
+# Block bots by User Agent string
+SetEnvIfNoCase User-Agent "^Mozilla\/4.0 \(compatible\; MSIE 6.0\; Windows NT 5.1\; SV1\)" bad_bot
+# Block empty User Agent string
+SetEnvIfNoCase User-Agent ^$ bad_bot
+SetEnvIfNoCase User-Agent "^AESOP_com_SpiderMan" bad_bot
+SetEnvIfNoCase User-Agent "^Alexibot" bad_bot
+SetEnvIfNoCase User-Agent "^Zyborg" bad_bot
+<Limit GET POST HEAD>
+Order Allow,Deny
+Allow from all
+Deny from env=bad_bot
+</Limit>
+</file>
+<file>
+service httpd restart
 </file>

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