North American Network Operators Group

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Re: identify hostname

  • From: Jon Zeeff
  • Date: Tue Dec 01 16:17:47 1998

Who is willing to write a tool to do broadcast address discovery and 
access-list generation?  Ideally with a config file that would allow 
one to avoid serious self smurfing (ie, ranges to check and patterns
to assume are broadcasts without trying them).  

> Filtering broadcast addresses is pretty ugly. Consider that a single Class
> C broken down into /30's can have 64 broadcast addresses. Maybe if it was
> just filtering your own assigned subnets, it would be possible, but this
> also applies to customer-subnetted broadcast addresses, so you'd have to
> coordinate your filter with every one of your customers, every time they
> change subnets. Not impossible, but pretty close.