netdev - Fw: [Bug 75221] New: CONFIG_PROC_SYSCTL is required for networking

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Message-ID: <20140501091515.2371058e@nehalam.linuxnetplumber.net>
Date:	Thu, 1 May 2014 09:15:15 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 75221] New: CONFIG_PROC_SYSCTL is required for networking

Begin forwarded message:

Date: Thu, 1 May 2014 03:17:32 -0700
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: [Bug 75221] New: CONFIG_PROC_SYSCTL is required for networking

https://bugzilla.kernel.org/show_bug.cgi?id=75221

            Bug ID: 75221
           Summary: CONFIG_PROC_SYSCTL is required for networking
           Product: Networking
           Version: 2.5
    Kernel Version: 3.14.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: shemminger@...ux-foundation.org
          Reporter: stefan@...ink.de
        Regression: No

I am in the proces of building an embedded kernel which I wanted to limit in
both functionality and memory. For this reason I disabled CONFIG_PROC_SYSCTL. I
have figured out the hard way that this functionality implements the successful
randomisation of source ports, it might be responsible for the initialisation
of net.ipv4.ip_local_port_range.

Effectively, booting a kernel with ip=dhcp works. Ping-pong (ICMP) to and from
an address works. DNS queries (UDP/53) don't because the source port remains 0,
a connection to a typical webserver also seems to result in a no reply
situation.

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