Additional Public IP addresses

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hi, have external nic on isa server has 5 additional ip addresses added in advanced section of tcpip settings. addresses 202.xx.xxx.xx subnet mask of 255.255.255.248 working fine.
i need add additional public ip addresses web server sits behind isa. 
problem when add 6th ip address above subnet mask error message 


the combination of ip address , subnet mask invalid. of bits in host address portion of ip address set 0. please enter valid combination of ip address , subnet mask. machine virtual (hyper v)
thanks in advance

you receive error, because with 255.255.255.248 subnet can use block of six addresses.

the 255.255.255.248 subnet mask marks 29bits of 32bits of ip address network portion.
for instance when have 202.0.0.0/29 range can use 202.0.0.1 202.0.0.6 addresses.
when looking @ last three bits of ip addresses you''ll see addresses corresponding address range are:

202.0.0.0 11001010 00000000 00000000 00000000
202.0.0.1 11001010 00000000 00000000 00000001
202.0.0.2 11001010 00000000 00000000 00000010
202.0.0.3 11001010 00000000 00000000 00000011
202.0.0.4 11001010 00000000 00000000 00000100
202.0.0.5 11001010 00000000 00000000 00000101
202.0.0.6 11001010 00000000 00000000 00000110
202.0.0.7 11001010 00000000 00000000 00000111

red text network portion. green text host portion.

host portion consisting of zeros (in case 000) network address. cannot assigned windows host.
host portion consisting of ones (in case 111) broadcast address. can not assigned host.

in case tried assign address host portion contains zeros. windows not recognize address valid address.



Windows Server  >  Windows Server General Forum



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