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Applications
running on NAT clients that access the external network with TCP/IP
may notice some performance problems or failures. In particular, NFS
file systems that are mounted on NAT clients using TCP have experienced
some performance problems. External access from NAT clients using
UDP has been shown to work well. However, if access to the external network using
TCP is required, use the following steps to create a NAT client configuration
with a single default gateway.
Before beginning this procedure, ensure that all available
software patches for this release have been applied to the system. Save the default_gateway file
on all NAT client nodes, excluding the NAT servers and head node: # pdsh -a -x NAT_server and head_node \
cp /etc/init.d/default_gateway /etc/init.d/default_gatewaySAVE
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For example, if the head node is n124 and the NAT servers are nodes n122 and n123, you would enter a command similar to the following: # pdsh -a -x n[122-124] cp /etc/init.d/default_gateway \
/etc/init.d/default_gatewaySAVE
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If the nodes names are not sequential, enter a command similar
to the following: # pdsh -a -x n122,n126,n129 cp /etc/init.d/default_gateway \
/etc/init.d/default_gatewaySAVE
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Use the dbsysparams command to
modify the value of NAT_GATEWAYS from multiple to single: # /opt/hptc/sbin/dbsysparams "NAT_GATEWAYS"
NAT_GATEWAYS: multiple
# /opt/hptc/sbin/dbsysparams -s "NAT_GATEWAYS" "single"
# /opt/hptc/sbin/dbsysparams "NAT_GATEWAYS"
NAT_GATEWAYS: single |
Rerun nconfig and cconfig to rewrite the /etc/init.d/default_gateway file
on each node so that the file contains one default gateway definition: # pdsh -a service nconfig nconfigure
# pdsh -a service nconfig nrestart |
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