[c-nsp] Proxy ARP -- To disable, or not to disable..

[Julio Arruda]

A.L.M.Buxey at lboro.ac.uk wrote:
> Hi,
> 
>> when I was young and green and before the first nasty surprises, I even
>> agreed...) - and Cisco really dislikes changing defaults.
> 
> yep. change a default like that and some peoples whole networks might stop
> operating after the upgrade - eg because all their servers have
> the wrong gateway or subnet mask.
> 
> alan
> PS we've been slowly migrating our networks from have this feature
> enabled. ie turn it off.

I do remember one specific topology (DMS switches with EIUs and etc), 
where proxy-arp was used as a requirement in some configurations.

And, of course, changing a default that could break things is a bad idea.
PS: (I do remember cisco changing some defaults, ip subnet-zero I think 
?, but they really try hard to not break things :-)