Setting UDP and TCP Kernel Parameters Manually

If you do not use a Fixup script or CVU to set ephemeral ports, then set TCP/IP ephemeral port range parameters to provide enough ephemeral ports for the anticipated server workload.

Check your current range for ephemeral ports:

# /usr/bin/ndd /dev/tcp tcp_largest_anon_port

65535

In the preceding example, tcp_largest_anon_port is set to the default value.

If necessary, edit the file /etc/rc.config.d/nddconf and add entries to update the UDP and TCP ephemeral port values. For example:

TRANSPORT_NAME[0]=tcp
NDD_NAME[0]=tcp_largest_anon_port
NDD_VALUE[0]=65500
 
 
TRANSPORT_NAME[1]=udp
NDD_NAME[1]=udp_largest_anon_port
NDD_VALUE[1]=65500

Ensure that the entries are numbered in proper order. For example, if there are two entries present for the TCP and UDP ports in nddconf, then they are numbered 0 through 1: TRANSPORT_NAME[0]=tcp and TRANSPORT_NAME[1]=udp.

Parent topic: Configuring Kernel Parameters on HP-UX Itanium Systems