This graph shows how network packets traverses linux netfilter and relative tables. It can be useful in code developing or to create iptables/ebtables rules.…
In a nutshell, TrackBack was designed to provide a method of notification between websites (more information).
Unfortunately, this mechanism is often a source of spam. You can disable it in two step.
(a) Disable trackbacks/pingbacks for new post/page:
Go in Setting->Discussion and uncheck “ ”
(b) Disable trackbacks/pingbacks for old post/page:
On machine where database lives (assuming mysql):
mysql mysql> use database_name; mysql> UPDATE wp_posts SET ping_status = 'closed'; mysql> bye