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Date:	Thu, 1 May 2014 09:15:15 -0700
From:	Stephen Hemminger <>
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: "" <>
To: "" <>
Subject: [Bug 75221] New: CONFIG_PROC_SYSCTL is required for networking

            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
        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

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