omshell: querying host info via ip address
dhcp1 at thehobsons.co.uk
Mon Mar 5 15:13:44 UTC 2012
>:-) Like I said: unless it is encoded somehow
>I don't believe I have ever seen a hex IP before.
>btw - that probably means that if he wants to look up by IP, that he
>will have to submit a hex IP for the query?
Dunno about that, but in general an IP address is simply a 32 bit (4
byte) value - how it is used (internally by computers etc) is
completely disconnected from how it's represented for the benefit of
the fleshware. We use the "dotted decimal" notation simply as a
convenient way of writing it, though I find hex is often better
(especially when thinking in terms of ranges and masks).
IPv6 has gone to hex for standard representations as it's a lot more
concise and allows splitting (particularly reverse DNS) at 4 bit
boundaries (one hex digit).
But that digresses a bit.
Within ISC DHCP configs etc, you can use hex (eg ac:10:01:63), dotted
decimal for IP addresses (eg 172.16.0.99), or even strings (eg
"\254\020\001c" - where \nnn is Octal). I'd assume the same is likely
to be the case with Omshell as it's from the same stable.
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