My server (http://monitor.wingify.com/munin/visualwebsiteoptimizer.com/app.visualwebsiteoptimizer.com.html) recently had an outrage. One of the suspecious things I found was loads of SYN flooding messages in /var/log/messages
Feb 8 15:17:34 app kernel: possible SYN flooding on port 80. Sending cookies. Feb 8 15:36:58 app -- MARK --
There are loads of SYN flooding errors and loads of -- MARK -- entries. What does this mean. Any correlation of data in munin graphs and this SYN flooding error that I should be aware / cautious about.
How can I fix this and what could be the possible error