Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!uwm.edu!bionet!ames!dftsrv!tom
From: tom@fangorn.gsfc.nasa.gov (Thomas D. Schardt)
Newsgroups: comp.sys.sgi
Subject: Turning Off Ipforwarding on Irix 3.2
Message-ID: <818@dftsrv.gsfc.nasa.gov>
Date: 7 Feb 90 16:00:14 GMT
Sender: news@dftsrv.gsfc.nasa.gov
Reply-To: tom@fangorn.gsfc.nasa.gov (Thomas D. Schardt)
Distribution: usa
Organization: NSESCC, Goddard Space Flight Center, Greenbelt MD
Lines: 37

Our network management wants all UNIX workstations that are not
performing routing functions (99.9% of the machines on base) to
turn off ipforwarding.  Unforunately, SGI sets ipforwarding as 
the default.  I have read "Kernal Configuration" in the Irix 3.2
System Administrator's Guide, and I have determined that the
following procedure should rebuild the kernal with ipforwarding
off:

   % su
   # cd /usr/sysgen/master.d
   # cp bsd bsd.old
   # vi bsd
      change
	      int ipforwarding = 1;
      to
	      int ipforwarding = 0;
      ZZ
   # cd /usr/sysgen/boot
   # cp bsd.a bsd.a.old
   # lboot -u /unix.install
   # cd /
   # cp unix unix.orig
   # sync
   # sync
   # reboot

   When /etc/rc2.d/S95autoconfig is run and the following prompt appears,
   answer 'y':

      Automatically reconfigure the operating system?

Is this the correct procedure?  Also is there any way of determining if
the ipforwarding flag is off in a given kernal file?
Tom Schardt                        Bitnet:    K4TDS at SCFVM
NASA/Goddard Space Flight Center   Internet:  K4TDS@SCFVM.GSFC.NASA.GOV
Code 632                           Opinions expressed are my own and do not
Greenbelt, MD 20771                necessarily reflect the opinions of my employer