NPM 10.3 Network Discovery finding broadcast address as Found Node.

Question

This has been happening for a long time.  For sure during all the 10.x version.  Our Cisco 1841 routers typically have a "class C" subnet.  My scan runs for a class B subnet.  Discovery finds the .255 address and sometimes the .0 broadcast address and lists them as Found Nodes.  I've got probably 1000 of these addresses ignored.  Is this some type of bug?

smartd · Answer

It's not a big deal, but it trips me up when we use subnets smaller than a 24.  I'll accidentally import the broadcast address, then have two entries for a router, and have to go back and delete.  I just wanted someone to know that this is a problem, and my ignore list is full of these addresses.

wbrown · Answer

I've been getting the same results on a number of my devices.  I haven't bothered to troubleshoot or open a case.

My discoveries are configured as /24 and the subnets being discovered are configured as /24.

I don't recall if we saw this during 10.1 or 10.2.