Can fixed addresses ever be taken by dynamic ranges

R Landster dchp_mailing at library.uiuc.edu
Wed Jun 6 17:02:28 UTC 2007


I have a question concerning the algorithm used to choose the IP address 
upon a DHCP request.

Here is the complete dhcp configuration:

#### START OF dhcp.conf
authoritative ;
deny unknown-clients ;
subnet 192.168.0.0 netmask 255.255.0.0 {
   option routers 192.168.0.1 ;
   range 192.168.0.2 192.168.255.255 ;
}
host MYWORKSTATION
{
   hardware ethernet 00:66:B7:86:FC:5F ;
   fixed-address 192.168.0.3 ;
}
host MYLAPTOP
{
   hardware ethernet 00:B4:20:68:1E:77 ;
}
#### END OF dhcp.conf

Here is the question: Are there any circumstances under which the IP 
address '192.168.0.3' would ever be leased out to MYLAPTOP?

For example, assume that MYLAPTOP has never been on the network. Is it 
possible that the DHCP service might give out 192.168.0.3? Or is the 
DHCP service "smart" enough to realize that 192.168.0.3 is meant for a 
specific machine, even if that machine is not (or never has been) on the 
network?

Thanks.





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