Scanning subnetwork considered bad or not?

["RUOFF, LARS (LARS)** CTR **" <lars.ruoff () alcatel-lucent com>]

Hi,
i was analyzing my home network with my favorite tool ;), when i got seriously scared about the fact that some of my 
PCs were doing continous ARP requests for the whole address range of the local subnet (/24). Obviously i thought 
something very bad was going on and that my PCs were infected.

After setting up a trap, i finally found the guilty to be the Canon Network Scanner utility. (The word "Scanner" here 
initially stands for machines scanning sheets of paper, not networks! ;) )

Ok, so normal behaviour. But isn't this behaviour seriously violating LAN netiquette??
Do a lot of services use this?
I guess that this would be a NO GO in an enterprise environment?

Just wondering...

regards,
Lars
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