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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