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Date:      Wed, 11 Feb 2015 09:27:38 +0000
From:      "Eggert, Lars" <lars@netapp.com>
To:        Matt Churchyard <matt.churchyard@userve.net>
Cc:        "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject:   Re: Invalid subnet masks
Message-ID:  <DE405399-70FE-48A3-B550-992EDEB5C468@netapp.com>
In-Reply-To: <7e069c1946454793b1c7e0be988877c4@SERVER.ad.usd-group.com>
References:  <7e069c1946454793b1c7e0be988877c4@SERVER.ad.usd-group.com>

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On 2015-2-11, at 09:59, Matt Churchyard <matt.churchyard@userve.net> =
wrote:
> Just been helping someone on the forums who appears to have configured =
their network interface incorrectly. It looks like they've assigned =
250.250.250.0 as the netmask.

that's not invalid. The netmask is a mask and not a prefix like in IPv6.

We could warn when people configure netmasks that are not contiguous =
prefixes (which is the usual practice), but such configurations need to =
remain allowed.

Lars


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