[Python-Dev] PEP 3144 review. (original) (raw)
Greg Ewing greg.ewing at canterbury.ac.nz
Wed Sep 16 23:59:47 CEST 2009
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Nick Coghlan wrote:
Or, to put it another way, given an arbitrary host in a network (e.g. your own machine or the default gateway) and the netmask for that network, calculate the network address.
Some people have claimed that the gateway address of a network isn't necessarily the zero address in that network. If that's true, then you can't calculate the network address from a host address and a netmask -- there isn't enough information. Furthermore, an IPNetwork object needs to be able to represent a network address whose address part contains bits that aren't in the mask.
-- Greg
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