Skip to main content
A
Anonymous_User
Contributor
July 22, 2004
Question

Definition " Low" & " High" in Destination Port

  • July 22, 2004
  • 2 replies
  • 5488 views
Dear All, 1. I have Fortiget-100, i need to know what' s the mean of " Low" and " High" in Destination Port when configure Firewall => Service => Custom. Low - High = port range from low port number to high port number or Low = low priority High = High priority ?? 2. Then, when i want to block TCP port 665 (the port which curently being use by virus W32.Netsky.Z to spread), are my configuration below is correct? Source Port: Low = 1 High = 65535 Destination Port: Low = 1 High = 665 Thanks before

    2 replies

    A
    Anonymous_UserAuthor
    Contributor
    July 22, 2004
    Low, high is used to declare RANGE of ports. Some protocols start and end from specific ports to specific ports (or ranges of ports). A web brouser will use a port from 1024 to 65535 (source port) to conect only to port 80 (destination port). High and low is for this reason.
    A
    Anonymous_UserAuthor
    Contributor
    July 31, 2004
    You have the source port information correct, but your Destination information settings will block every port between 1 and 665. Change it to Low=665 and High=665, and you' ll only block port 665. Good luck -Eric Wall
    Terms & ConditionsAccessibility statement