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Subject: [Bug 267278] ipfw mask addr:mask syntax creates wrong rule
Date: Sat, 22 Oct 2022 21:15:08 +0000
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X-Bugzilla-Version: 13.1-STABLE
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X-Bugzilla-Severity: Affects Only Me
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D267278
Bug ID: 267278
Summary: ipfw mask addr:mask syntax creates wrong rule
Product: Base System
Version: 13.1-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: bugs@FreeBSD.org
Reporter: igor.polovykh@gmail.com
man ipfw
ip-addr:
A host or subnet address specified in one of the following way=
s:
...............
addr:mask
Matches all addresses with base addr (specified as an =
IP
address, a network number, or a hostname) and the mask=
of
mask, specified as a dotted quad. As an example,
1.2.3.4:255.0.255.0 or 1.0.3.0:255.0.255.0 will match
1.*.3.*. This form is advised only for non-contiguous
masks. It is better to resort to the addr/masklen for=
mat
for contiguous masks, which is more compact and less e=
r-
ror-prone.
...........
I tried to set rule to block many broadcasts from several subnets
ipfw add deny ip from any to 1.2.0.255:0.0.255.0
but when I look at created rules table with 'ipfw show' I see:
....
03300 0 0 deny ip from any to 0.0.0.0:0.0.255.0
....
This is not I expected and manual page says about it.
I expected:
03300 0 0 deny ip from any to 1.2.0.255:0.0.255.0
Perhaps I don't understand something.
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