Route add in HP Unix

Let us assume your router address is 192.168.1.254 and network ID is 192.168.1.0/24, then you can type route command as follows:
# route add net 192.168.1.0 netmask 255.255.255.0 192.168.1.254
OR
To add a default route:
# route add default 192.168.1.254
Verify that (display) routing table is updated (display routing table):
# netstat -nr
Test it i.e. try to ping or send nslookup request:
# ping mycorp.com
To flush all routing entries use command [quite handy to clean your gordian knot ;)] :
# route -f
However if I reboot HPUX box then above routing entries gets removed. To pick up your setting upon each reboot your need to configure Routes in HPUX networking configuration file - /etc/rc.config.d/netconf. To add default router/gateway 192.168.1.254:

# vi /etc/rc.config.d/netconf
Add or modify following entries
ROUTE_DESTINATION[0]="default"
ROUTE_MASK[0]=""
ROUTE_GATEWAY[0]="192.168.1.254"
ROUTE_COUNT[0]="1"
ROUTE_ARGS[0]=""

Reboot HP-UX system/server to take effect

# shutdown -ry 0

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