Difference between revisions of "Filtered Ports"

Revision as of 15:57, 3 September 2014

Network Wide

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)
• 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.

UTOPIA

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