[Bug-wget] --random-wait

[John]

Hello. In reading the manual for Gnu Wget 1.13.4, I have a question about 
the section explaining the option "--random-wait".  The explanation 
providing some of the motivation for the option includes this statement:

"A 2001 article in a publication devoted to development on a popular 
consumer platform provided code to perform this analysis on the fly. Its 
author suggested blocking at the class C address level to ensure automated 
retrieval programs were blocked despite changing DHCP-supplied addresses."

What exactly does this last sentence mean, especially the part about 
"changing DHCP-supplied addresses"? Thanks.