From owner-freebsd-questions  Wed Jan  9 11:12:52 2002
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From: "Rodrigo A B Freire" <bsdstuffs@brasilia.br>
To: <teslik@yahoo.com>, <freebsd-questions@FreeBSD.ORG>
References: <20020109174233.57855.qmail@web12202.mail.yahoo.com>
Subject: Re: subnetting / ifconfig ip allocation problem
Date: Wed, 9 Jan 2002 17:12:18 -0200
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    For a correct subnetting, get used to divide the last octet of the net
addres IP [the first reserved one] by the total amount of IPs on your
subnet.

    The result should be round.

    e.g.: you tried IPs 91 and 92, on a 4-IPs subnet. Two of them are
reserved (90 and 93).
    to verify if is 90 valid, divide 90 / 4 = 22.5 . This subnet is invalid.

    But, 92 as net address, 93 and 94 as range ips and 95 as broadcast must
work. (92/4=23)

    Best regards,
    Rod.

----- Original Message -----
From: "Alex Teslik" <teslik@yahoo.com>
To: <freebsd-questions@FreeBSD.ORG>
Sent: Wednesday, January 09, 2002 3:42 PM
Subject: subnetting / ifconfig ip allocation problem


> Hello,
>
>    I have two boxes - WindowsME and FreeBSD4.4R
>    When I set the machines like:
>
>            WindowsME
>            ip     xxx.xxx.xxx.91
>            subnet 255.255.255.0
>
>            FreeBSD
>            ip     xxx.xxx.xxx.92
>            subnet 255.255.255.0
>
>     I can access both machines remotely and each machine can ping
themselves
> and each other.
>
>    When I set the machines like:
>            WindowsME
>            ip     xxx.xxx.xxx.91
>            subnet 255.255.255.252
>
>            FreeBSD
>            ip     xxx.xxx.xxx.92
>            subnet 255.255.255.252
>
>     I cannot ping each machine and FreeBSD gives me an error from ifconfig
that
> it cannot allocate the ip address. The FreeBSD machine can't even ping
itself
> (probably because it can't allocate the ip to begin with). localhost can
always
> be pinged in both scenarios. This is a two machine closed network.
>     This probably exposes some sort of basic misunderstanding on my part,
but
> can anyone explain why this would happen and how I can fix it? Sorry in
advance
> for no output, but I can't access the machines from where I am right now.
>
> Thanks,
> Alex
>
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