IP address is no longer fixed 4 bytes nor fixed 16 bytes. It can be both of them. So, every storage class should be changed. For some of source codes that use 'int' as storage for IP address, this is most troublesome because it could be hidden to simple text search. -Reading and parsing IP address from config file should be changed as well. +Reading and parsing IP address from config file should be changed as well. If an existing code base entirely relied on BSD socket interface such as inet_aton or inet_addr, it would be easier. However, if the code has proprietary parsing/converting functions, every incident should be found and changed. IPv6 address string is far longer than IPv4 address. IPv6 address [0001:0002:0003:0004:0005:0006:0007:0008], length is 41. IPv4 address 101.202.103.203, length is 15. About 3 times longer.
