Skip to main content
Help

Port Filtering

This page will help provide some information about Port Filtering with Slingshot Broadband.

 

 

What is Port Filtering?

Port filtering is a network security technique that allows or blocks data packets based on their port number, which corresponds to specific applications or services. It’s commonly used in firewalls, routers, and other access control devices to manage traffic flow and protect systems from unauthorised access.

Think of ports as virtual doors on a device—each one assigned to a specific service:

  • Port 80: HTTP (web traffic)
  • Port 443: HTTPS (secure web traffic)
  • Port 22: SSH (remote login)
  • Port 53: DNS (domain name resolution)

Port filtering ensures that only approved traffic can pass through these doors, helping to isolate and secure network communications.


How do I disable Port Filtering? 

By default, Slingshot adds port filtering to all Broadband accounts.

To disable it, follow the below method:

  • Simply log into your MySlingshot account
  • Click on your Broadband service
  • Scroll down to the bottom and click Disable
    • clipboard_9d573609-b35a-4cb8-9087-32f1587e08e2.png

Inbound Traffic Ports

Below are a list of ports that can be used to enable/disable certain Internet traffic.

Port

Inbound traffic

0

 

20

FTP data

21

FTP data

22

SSH (Secure Shell), File transfers

23

Telnet

25

SMTP (email sending)

53

DNS server

67

Bootstrap server, DHCP

68

Bootstrap client, DHCP

80

HTTP server

110

POP3 server

135

remote manage DHCP, DNS server

137

NetBIOS name service

138

NetBIOS Datagram

139

NetBIOS Session

143

IMAP server

161

SNMP

162

SNMP

443

HTTPS server

547

DHCPv6 server

593

HTTP RPC remote procedure

2049

NFS