systemd Unit - Modifying IPv4 parameters

[Bryn M. Reeves]

On 05/08/2013 05:44 PM, T.C. Hollingsworth wrote:
> On Wed, May 8, 2013 at 9:33 AM, Tony Su <tonysu at su-networking.com> wrote:
>> In the "old days" edits were made directly to the appropriate file
>> /proc/net/ipv4/...
>
> Are you looking for /proc/sys/net/ip4?  AFAICT /proc/net hasn't
> existed since everyone switched over to the 2.6 kernel (which happened
> in Fedora Core 2 in 2004).

/proc/net (network status & stats) is still there, it's just not the 
same as /proc/sys/net (sysctl networking tunables), from man proc:

     /proc/net
     various net pseudo-files, all of which give the status of some
     part of the networking layer.  These files contain ASCII structures
     and are, therefore, readable with cat(1).  However, the standard
     netstat(8) suite provides much cleaner access to these files.

     /proc/sys
     This  directory  (present since 1.3.57) contains a number of files
     and subdirectories corresponding to kernel variables.  These
     variables can be read and sometimes modified using the /proc file
     system, and the (deprecated) sysctl(2) system call.

     /proc/sys/net
     This directory contains networking stuff.  Explanations for some of
     the files under this directory can be found in tcp(7) and ip(7)

Persistent changes still go to /etc/sysctl.conf or you can now drop-in 
files to /etc/sysctl.d with systemd.

Regards,
Bryn.