IP Protocol

Discussion in 'Capsa Network Analyzer' started by Searching_ _ _, Mar 2, 2010.

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  1. Searching_ _ _

    Searching_ _ _ Registered Member

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    The protocol number can be found in the Protocol field of an IP header.
    http://support.microsoft.com/kb/289892

    What is its purpose of the protocol field?
    Is this used in any way to help direct packet flow in and through a network?
     
  2. Searching_ _ _

    Searching_ _ _ Registered Member

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    Normaly 6=TCP and 17=UDP are the most common protocols listed in the protocol field of the header.

    What occurs when protocols other than 6 or 17 are used?

    How is the routing affected in a LAN?
    How does a firewall handle the alternate protocol numbers?
     
  3. Colasoft Support

    Colasoft Support Colasoft Moderator

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    Hi Searching___,

    The protocol field is used to identify the upper class protocol, such as TCP and UDP, to ensure the data goes to its destination.

    General routers don't consider this field, they just need the destination address. While firewalls might take this field into consideration to identify if the packet is legal.

    But different devices may take different actions, you can build some packets to figure it out.

    You are welcome to tell us the results:)

    Have a good day!
     
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