Patch Name:  PHNE_4052

Patch Description: s700 8.07 ARPA Transport patch for system hang

        Under heavy loads tcp may begin to run out of memory
        buffers.  Packets can be sent with no data in an infinite loop,
        which will show up in a lan analyzer trace as an "ack storm",
        i.e. a series of identical packets with no data and the ACK
        flag set.  The system will also appear to hang during this
        period.

Path Name:  /hp-ux_patches/s700/8.X/PHNE_4052

Effective Date:  940407

OS Release:  8.07

Reboot Required:  Yes

Patch Files:  tcp_output.o

SR#:  4701097816

"what" string/timestamp:  tcp_output.o:
         PHNE_4052 tcp_output.c $Revision: 1.2.187.2 $

"sum" output:  
   6628 12 tcp_output.o

Dependencies:  None

Supersedes:  None

Patch Package Size:  62 Kbytes

Installation Instructions:  

     Please review all instructions and the Hewlett-Packard
     SupportLine User Guide or your Hewlett-Packard support terms
     and conditions for precautions, scope of license,
     restrictions, and, limitation of liability and warranties,
     before installing this patch.

     Note: Please back up your system before you patch.

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After getting the patch onto your machine, unshar the patch (sh PHNE_4052).

To install this patch do the following:
1) Run /etc/update (Note: you must be logged in as root to update
   a system).
2) Once in the update "Main Menu" move the highlighted line to "Change
   Source or Destination ->" and press "Return" or "Select Item".
3) Make sure the highlighted item in the "Change Source or Destination"
   window is "From Tape Device to Local System ...", then press "Return" or
   "Select Item".
4) You should now be in the "From Tape Device to Local System" window.
   Change the "Source:  /dev/rmt/0m" to "Source: /tmp/PHNE_4052.updt"
   (this assumes that you are in the /tmp directory where PHNE_4052.updt
   has been placed).  Note: You must enter the complete path name.
5) Press "Done".
6) From here on follow the standard directions for update.

The customized script that update runs will move the original software
to /system/PHNE_4052/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHNE_4052.text file to /system/PHNE_4052 to be retained for
future reference.

If you wish to put this patch on a magnetic tape and update from the tape
drive, dd a copy of the patch to the tape drive.  As an example the
following will create a copy of the patch that update can read:
dd if=PHNE_4052.updt of=/dev/rmt/0m bs=2048