Dear SCO Customer,

Support Level Supplement (SLS) ptf7083c, the ReliantHA gratuitous arp
Supplement, allows ReliantHA Virtual Server to be configured using gratuitous
arp.

Previously, ReliantHA Virtual Server implementation required setting the
multicast MAC address on a card.

Note: For this enhancement to work on UnixWare 7.0.0, you must install
      SLS ptf7084a and SLS ptf7010b (or greater). For it to work on
      UnixWare 7.0.1, you must install SLS ptf7069c (or greater).
      After these SLSs have been installed, install SLS ptf7083c.


SLS ptf7083c contains:

        /usr/opt/reliant/bin/ipalias_off
        /usr/opt/reliant/bin/ipalias_on
        /usr/opt/reliant/build/samples/grat_nfs.hl


Software Notes and Recommendations
----------------------------------

ptf7083c should only be installed on:

        UnixWare 7 ReliantHA 1.1 on UnixWare 7.0.0 with the UnixWare 7
                                             Release Supplement (uw7rs)
        UnixWare 7 ReliantHA 1.1 on UnixWare 7.0.1
        UnixWare 7 ReliantHA 1.1 on UnixWare 7.1.0
        UnixWare 7 ReliantHA 1.1 on UnixWare 7.1.1


The gratuitous arp implementation of ReliantHA uses the "-i" option to
arp(1Mtcp). This option is available on Releases:

        UnixWare 7.0.0 with ptf7084a(or greater) and ptf7010b(or greater)
        UnixWare 7.0.1 with ptf7069c(or greater)
        UnixWare 7.1.0
        UnixWare 7.1.1

To configure ReliantHA Virtual Server to use gratuitous arp, the relevant
line in /usr/opt/reliant/etc/hvipalias should look something like:

        virtserver GR:AA:00:3F:19:DB /dev/net0 net0 192.202.33.5 255.255.255.0 \
        host1 host2 host3

If the first two "digits" of the MAC address in hvipalias are "GR", then the
rest of the MAC address is ignored and Virtual Servers are implemented using
gratuitous arp.

If the first two "digits" of the MAC address in hvipalias are not "GR", then
then Virtual Servers are implemented using Multicast MAC addresses as done
previously.

ReliantHA systems with this supplement installed support both implementations
of Virtual Servers. However, it is not permissible to have examples of both
implementations in the same ReliantHA configuration file.

When ReliantHA brings up a virtual server using the gratuitous arp
implementation, it uses "arp -i" to send a gratuitous arp request to ensure
that routers and clients on the subnet update their arp tables with the
primary MAC address of the board specified in the third field of the
hvipalias file (/dev/net0 in the example above).

This example configuration that uses the gratuitous arp implementation
is installed as:

/usr/opt/reliant/build/samples/grat_nfs.hl

/* grat_nfs.hl */

#include "defines.hl"

Cluster
{
    { SYSA,SYSB }                       // nodes
    { }                                 // cluster attributes
        Application                     // under control of Reliant
        {
            App1
            { SYSA,SYSB }               // priority
            { AutoStartUp AutoSwitchOver }      // application attributes
            {
                Ip ( virtserver )
                        {
                                Nw(Nw_01, GR:AA:00:3F:19:DB)
                                Share( /SHARE )
                                {
                                    PMOUNT( /SHARE,vxfs,/dev/dsk/c1b0t1d0sc )
                                }
                        }
           }
        }
}


Installation Instructions
-------------------------

1. Download the ptf7083c.Z file to the /tmp directory on your machine.

2. As root, uncompress the file and add the package to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7083c.Z
        # pkgadd -d /tmp/ptf7083c
        # rm /tmp/ptf7083c

3. There is no need to reboot the system after installing this package.

The release notes displayed prior to installation can be found in:

        /var/sadm/pkg/ptf7083/install/ptf7083.txt


Removal Instructions
--------------------

1. As root, remove the package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf7083

2. There is no need to reboot the system after removing this package.


If you have questions regarding this SLS, or the product on which
it is installed, please contact your software supplier.