https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212229
Bug ID: 212229
Summary: IP IDs generation behavior issue
Product: Base System
Version: 11.0-RC1
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: jldu...@gmail.com
CC: freebsd-am...@freebsd.org
CC: freebsd-am...@freebsd.org
FreeBSD 11.0-RC1: The `net.inet.ip.random_id` sysctl does not appear to be
randomizing when set to `1`.
Tested on two bhyve virtual machines and using nmap.
FreeBSD 11.0-RC1:
$ nmap -O -v -Pn freebsd-11.0-rc1.example.com
...
IP ID Sequence Generation: All zeros
...
FreeBSD 10.3-RELEASE (works as expected):
$ nmap -O -v -Pn freebsd-10.3-release.example.com
...
IP ID Sequence Generation: Randomized
...
On 10.3-RELEASE, out of the box (`net.inet.ip.random_id=0`) the IP IDs
generation behavior was "Incremental", as stated in `inet(4)`.
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