Filtered Ports: Difference between revisions

Revision as of 10:39, 9 September 2015

We currently filter (block) the following ports on all DSL and Dialup connections by default:

19 (udp) chargen
53 (udp) domain - IP addresses that test positive for open recursion DNS servers
123 (udp) ntp - IP addresses that test positive for open query NTP servers
135 (tcp, udp)
137-139 (tcp, udp) NETBIOS
445 (tcp, udp) Microsoft-DS (CIFS)
1900 (udp) SSDP
1433, 1434 (udp) MS SQL Server
4444 (tcp) Worm-sign
31337 (tcp) BackOrifice

We filter and block these ports by default to cut down on the number of 'drive-by' infections.

At this time we do not have any filtered ports for customers specific to UTOPIA

@@ Line 1: / Line 1: @@
+== DSL ==
-== Network Wide ==
+We currently filter (block) the following ports on all DSL and Dialup connections by default:
-The following ports are filtered at XMission's borders, primarily due to their abuse in "Denial of Service" attacks.
 *19 (udp) chargen
-*1900 (udp) SSDP
 *53 (udp) domain - IP addresses that test positive for open recursion DNS servers
 *123 (udp) ntp - IP addresses that test positive for open query NTP servers
-== DSL / Dialup ==
-We currently filter (block) the following ports on all DSL and Dialup connections by default:
 *135 (tcp, udp)
 *137-139 (tcp, udp) NETBIOS
 *445 (tcp, udp) Microsoft-DS (CIFS)
+*1900 (udp) SSDP
 *1433, 1434 (udp) MS SQL Server
 *4444 (tcp) Worm-sign