yes, pf for newbies... sorry

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On Thursday 30 November 2006 17:03, Daniel T. Staal wrote:
> On Thu, November 30, 2006 4:34 pm, Vim Visual said:
> > Hi,
> >
> > ahem... I am starting to play around with pf and I am trying to figure
> > out how my internal interface and external interface are called... I
> > mean dhcp and the private IP address...
> >
> > I am using this by now:
> >
> > ext_if="fxp1"           #the external interface
> > int_if="fxp0"           #the internal interface
> > internal_net="192.138.3.100/150"
>
> Um, that number after the '/' is the number of bits in the bitmask that
> are _not_ allowed to vary.  Assuming you meant the address range
> 192.138.3.100 to 192.138.3.150, the closest bitmask would be /26.  (Which
> actually allows the range up to 192.138.3.162.)
>
> Daniel T. Staal

What you are running into are bit masks. Rather than listing them out for you 
it would be easier if you googled for a subnet calculator. Then you would see 
what ranges and options you have. Basically if you start with 256 and divide 
it in half and keep on going you'll see which ranges are available and with 
the calculator you'll see what mask that is.

You cannot pick a number like 100 and start a subnet on it. It must be on the 
border of 2,4,8,16,32 etc, starting at 0. 96 is the number closest to 100 for 
any larger range of IP's.

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