Managing Serviceguard Seventeenth Edition, First Reprint December 2009

NOTE: If you contact HP support regarding Serviceguard or networking, please be
sure to mention any parameters that have been changed from their defaults.
Serviceguard has also been tested with non-default values for these network parameters:
• ip6_nd_dad_solicit_count — This network parameter enables the Duplicate Address
Detection feature for IPv6 addresses. You can find more information l under “IPv6
Relocatable Address and Duplicate Address Detection Feature” (page 446).
• tcp_keepalive_interval — This network parameter controls the length of time the
node will allow an unused network socket to exist before reclaiming its resources
so they can be reused.
The following requirements must be met:
— The maximum value for tcp_keepalive_interval is 7200000 (2 hours, the HP-UX
default value).
— The minimum value for tcp_keepalive_interval is 60000 (60 seconds).
— The tcp_keepalive_interval value must be set on a node before Serviceguard is
started on that node. This can be done by configuring the new
tcp_keepalive_interval in the /etc/rc.config.d/nddconf file, which will
automatically set any ndd parameters at system boot time.
— The tcp_keepalive_interval value must be the same for all nodes in the cluster.
• ip_strong_es_model — This network parameter controls support for the strong
end-system model, which prevents a system from acting as a router. For more
information about this model, see the HP-UX IPSec Version A.03.00 Administrator's
Guide which you can find on docs.hp.com under Internet and Security
Solutions —> IPSec. See also the section “Default Gateway for each Physical
IPv4 Interface” in the latest edition of the TOUR Transition Release Notes; as of the
date of this manual, those release notes could be found at http://docs.hp.com/
en/5992-1909/5992-1909.pdf.
ip_strong_es_model is disabled (set to 0) by default. Setting it to 1 enables it.
CAUTION: HP supports enabling this parameter only if:
— You are running Serviceguard A.11.19 with patch PHSS_39613 (for HP-UX
11i v2) or PHSS_39614 (for HP-UX 11i v3) or later; and
— You are not using a cross-subnet configuration (page 41).
Otherwise, leave the parameter at its default setting (zero, meaning disabled).
Enabling this parameter allows you to configure a default gateway for each physical
IPv4 interface. These gateways allow a system to send an unbound packet through
the interface for the address to which the socket (or communication endpoint) is
bound. If the socket (or communication endpoint) is not bound to a specific address,
Preparing Your Systems 203