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Meng_112830's avatar
Meng_112830
Icon for Nimbostratus rankNimbostratus
Sep 19, 2012

Host and Network destination address difference.

Correct my understanding if im wrong....let say if i have 2 VIPs "same segment"...one configured as a host "192.168.100.1" and the 2nd VIP configured as network "192.168.100.0 mask 255.255.255.0. when the users accessing the 192.168.100.1 VIP will it be the most specific IP or vip configured will process the client request?

 

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  • iamczar_12961's avatar
    iamczar_12961
    Icon for Cirrus rankCirrus
    Sep 19, 2012
    Hi Meng,

     

     

    When determining the order of precedence applied to new inbound connections, the BIG-IP uses an algorithm which places a higher precedence on the address netmask and a lesser emphasis on the port. BIG-IP sets virtual server precedence according to the following criteria:

     

     

    •The first precedent of the algorithm chooses the virtual server that has the longest subnet match for the incoming connection.

     

    •If the number of bits in the subnet mask match, the algorithm then chooses the virtual server that has a port match.

     

    •If no port match is found, the algorithm uses the wildcard server, if a wildcard virtual server is defined.

     

    •A wildcard address has a netmask length of zero, thus it has a lower precedence than any matching virtual server with a defined address.

     

     

    This results in the following order of precedence:

     

     

    :

     

    :*

     

    :

     

    :*

     

    *:

     

    *:*

     

     

    sol6459: Order of precedence for virtual server matching

     

    http://support.f5.com/kb/en-us/solutions/public/6000/400/sol6459.html

     

     

     

    HTH,

     

    Czar