Date: Tue, 23 Dec 2003 22:24:11 -0800
From: hugle <hugle@vkt.lt>
To: Robert Chalmers <robert@the-mission-of-our-lady-of-fatima.org>, security <freebsd-security@FreeBSD.org>
Subject: Re: address specified as 1.2.3.4/24{128,35-55,89} Is this Correct ????
Message-ID: <103305460579.20031223222411@vkt.lt>
In-Reply-To: <004301c3c9d3$b0219860$1a6001cb@chalmers.com.au>
References: <004301c3c9d3$b0219860$1a6001cb@chalmers.com.au>
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RC> The man page gives this example, however, when I attempt to use it, it seems
RC> to block the whole set?
RC> Could someone tell me what's going wrong here please. Thanks heaps..
RC> This works,
RC> ${fwcmd} add deny log all from any to 203.1.96.1 in via ${oif}
RC> This blocks the whole IP block, not just the list?
RC> ${fwcmd} add deny log all from any to
RC> 203.1.96.0/24{2,6-25,27-154,156-19 9,204-254} in via ${oif}
maybe "156-19 9" ? You have a space ( " " ) in here, so try out:
${fwcmd} add deny log all from any to 203.1.96.0/24{2,6-25,27-154,156-199,204-254} in via ${oif}
RC> the man page bit...
RC> list: {num | num-num}[,list]
RC> Matches all addresses with base address addr (specified as a
RC> dot-
RC> ted quad or a hostname) and whose last byte is in the list
RC> between braces { } . Note that there must be no spaces between
RC> braces and numbers (spaces after commas are allowed). Elements
RC> of the list can be specified as single entries or ranges. The
RC> masklen field is used to limit the size of the set of
RC> addresses,
RC> and can have any value between 24 and 32. If not specified, it
RC> will be assumed as 24.
RC> This format is particularly useful to handle sparse address
RC> sets
RC> within a single rule. Because the matching occurs using a bit-
RC> mask, it takes constant time and dramatically reduces the com-
RC> plexity of rulesets.
RC> As an example, an address specified as 1.2.3.4/24{128,35-55,89}
RC> will match the following IP addresses:
RC> 1.2.3.128, 1.2.3.35 to 1.2.3.55, 1.2.3.89 .
RC> Thanks
RC> Robert
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