Windows TCP/IP userland used to be a port of the BSD networking tools (I
think via Lachman Associates) so that's not surprising. Allegedly they
reimplemented it at some point.
On Thu, May 23, 2019 at 3:57 PM Keith Medcalf <kmedc...@dessus.com> wrote:
> On Thursday, 23 May, 2019 08:35, Dominique Devienne <ddevie...@gmail.com>
> wrote:
>
> >On Thu, May 23, 2019 at 3:50 PM Jose Isaias Cabrera
> ><jic...@outlook.com> wrote:
> >
> >> I have been working network for a long time, and I have never seen
> >> any application that takes "zeroed left-filled" IP addresses. Just
> >> sharing...
> >> Thanks.
>
> > Works for me with a .001 at least, as shown below. But that wasn't
> > really the point I was making, FWIW. --DD
>
> Well, actually, that depends on how the code in the network stack converts
> from presentation format to network format. Windows 10 1903 (at least)
> treats each component as an input number which means that a number that
> starts with a 0 is an octal number ... (ie, the BSD way)
>
> >ping 172.217.14.227
>
> Pinging 172.217.14.227 with 32 bytes of data:
> Reply from 172.217.14.227: bytes=32 time=26ms TTL=56
> Reply from 172.217.14.227: bytes=32 time=26ms TTL=56
>
> >ping 172.217.014.227
>
> Pinging 172.217.12.227 with 32 bytes of data:
> Reply from 172.217.12.227: bytes=32 time=73ms TTL=45
> Reply from 172.217.12.227: bytes=32 time=72ms TTL=45
>
> Other parsers may see the input as invalid:
>
> sqlite> select ipblobaddr(ipaddrblob('172.217.014.227'));
>
> sqlite> select ipblobaddr(ipaddrblob('172.217.14.227'));
> 172.217.14.227
>
> So really, what you get depends on who wrote the code that is doing the
> translation. Since the code that I used to implement ipblobaddr and
> ipaddrblob is taken from the ISC DNS Bind code based on code written by
> Paul Vixie in 1996, it is quite possible that many things will see leading
> 0's as invalid input. Some things (for example Cisco IOS) may also choose
> to just ignore the extra 0's. Other things may take it as an indicator
> that the value is base-8 rather than base-10.
>
> See
> https://tools.ietf.org/html/draft-main-ipaddr-text-rep-00
> https://en.wikipedia.org/wiki/Dot-decimal_notation
>
> ---
> The fact that there's a Highway to Hell but only a Stairway to Heaven says
> a lot about anticipated traffic volume.
>
>
>
>
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