Re: ipcalc is peculiar

On Friday 29 August 2003 22:07, Denis Hennessy wrote:
> Putting a '0' in front of a number is a way of forcing it to be
> interpreted as octal. 017 is a valid octal number, corresponding to the
> decimal value 15. However, 019 is not a valid number since you can't
> have '9' in an octal number.

That is not documented behaviour for either ipcalc or ifconfig

Nor is it consistent with other programs:
[spam@debian spam]$ ping -c4 172.019.0.1
ping: unknown host 172.019.0.1
[spam@debian spam]$ host 172.019.0.1
Host 1.0.19.172.in-addr.arpa not found: 2(SERVFAIL)
[spam@debian spam]$ telnet 172.019.0.1
172.019.0.1: Unknown host
[spam@debian spam]$

I think these programs show preferable results.


I thought of how to check ifconfig without breaking something. It's fine, 
though once there wasn't.




>
> /dh
>
> John wrote:
> >As I understand it, the four segments of a human'comprehendable IP address
> > are decimal number. Not binary, not hexadecimal or octal, decimal.
> >[spam@debian spam]$ ipcalc --network 172.19.0.1/8
> >NETWORK=172.0.0.0
> >[spam@debian spam]$ ipcalc --network 172.019.0.1/8
> >ipcalc: bad ip address: 172.019.0.1
> >[spam@debian spam]$ ipcalc --network 172.17.0.1/8
> >NETWORK=172.0.0.0
> >[spam@debian spam]$ ipcalc --network 172.017.0.1/8
> >NETWORK=172.0.0.0
> >[spam@debian spam]$
> >
> >
> >I believe, but haven't tested recently, that ifconfig also has this
> >affliction.
>
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