Issues encountered with assigning .0 and .255 as usable addresses?

Dan White dwhite at
Mon Oct 22 22:22:31 UTC 2012

On 10/22/12 17:18 -0500, Matt Buford wrote:
>On Mon, Oct 22, 2012 at 5:07 PM, Paul Zugnoni <paul.zugnoni at
>> wrote:
>> Any experience or recommendations? Besides replace the ISA proxy…. Since
>> it's not mine to replace. Also curious whether there's an RFC recommending
>> against the use of .0 or .255 addresses for this reason.
>Way back in the late 90's I tried this with a /23 dialup DHCP pool and
>quickly found that the .0 and .255 users couldn't get to some scattered web
>sites, though they seemed to be able to get to most of the Internet.
>However, a year or so ago I spun up an always-on Amazon ec2 instance with a
>static IP and was handed a .0 address.  I still use this VM regularly and
>have not run into any problems with reachability for this address.

I had a similar experience about 10 years ago, with DSL customers who had
been assigned .0 or .255 addresses not able to reach some sites.

Dan White

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