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Date: Tue, 13 Jun 2017 18:03:25 +0300
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Subject: [Bug] [Discussion] filter_var and reserved IP address range
From: newaltgroup@bk.ru (Andrew Nester)

Hello!
Currently I am working on bug #74699 (Thanks brianlmoon for pointing =
this issue).

Here is some details:
In patch applied for bug #72972 IP address block 240.0.0.0/4 has been =
removed from list of reserved.

But according to IP Multicast Address Specification:
=E2=80=9CThe range of addresses between 224.0.0.0 and 224.0.0.255, =
inclusive,
is reserved for the use of routing protocols and other low-leveltopology =
discovery or maintenance protocols,=20
such as gateway discoveryand group membership reporting. =20
Multicast routers should not forwardany multicast datagram with =
destination addresses in this range,regardless of its TTL.=E2=80=9D

Here is the full specification:=20
=
https://www.iana.org/assignments/multicast-addresses/multicast-addresses.x=
html

That=E2=80=99s why my PR introducing changes to include addresses =
between 224.0.0.0 and 224.0.0.255 in list of reserved.
Here is link to my PR
https://github.com/php/php-src/pull/2562

Thanks!=