Date: Mon, 26 Aug 2002 09:26:51 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Roger Harrell <roger@audiblefaith.com> Cc: freebsd-questions@freebsd.org Subject: Re: How to configure multiple IPs on FreeBSD Message-ID: <20020826082651.GB3063@happy-idiot-talk.infracaninophi> In-Reply-To: <3D695E8A.3BF8EAD@audiblefaith.com> References: <3D67FEA3.81CA0D0B@audiblefaith.com> <20020825113425.GB3075@happy-idiot-talk.infracaninophi> <3D695E8A.3BF8EAD@audiblefaith.com>
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On Sun, Aug 25, 2002 at 03:47:38PM -0700, Roger Harrell wrote:
> Just for my knowledge what is the 0xffffffff after netmask? Why use that
> vs 255.255.255.0 which is what is in the current line for the main IP in
> rc.conf?
The two formats are equivalent and either is accepted by FreeBSD's
ifconfig(8). FreeBSD seems to default to using the dotted quad style
whereas other Unix like Solaris prefers the hexadecimal style. You can
also give the network details in the address/mask style,
eg. 127.0.0.1/8
Thus
0xffffffff is equivalent to 255.255.255.255 or /32
0xfffffff0 255.255.255.240 or /28
0xffffff00 255.255.255.0 or /24
It's not just the netmask that can be expressed in several different
formats. An IP4 address is nothing more than a 32 bit unsigned
integer, and can be displayed in several ways. Eg. all of these are
equivalent:
http://www.bbc.co.uk/
http://212.58.224.56/
http://0xd43ae038/
http://3560628280/
Mind you, it seems that recent versions of Mozilla won't recognise the
last two, but something like lynx or w3m loads them up right away.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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