HP-UX Network Tuning.

ndd -set network_device parameter value
ex)ndd -set /dev/udp udp_def_ttl 128

And also change the file /etc/rc.config.d/nddconf

Parameter Scope Default Tuned value
maxfiles /stand/system 2048 4096 *
maxfiles_lim /stand/system 2048 4096 *
tcp_time_wait_interval ndd/dev/tcp 60000 60000
tcp_conn_request_max ndd/dev/tcp 20 1024 ; 4096
tcp_ip_abort_interval ndd/dev/tcp 600000 60000
tcp_keepalive_interval ndd/dev/tcp 72000000 900000
tcp_rexmit_interval_initial ndd/dev/tc 1500 1500
tcp_rexmit_interval_max ndd/dev/tcp 60000 60000
tcp_rexmit_interval_min ndd/dev/tcp 500 500
tcp_xmit_hiwater_def ndd/dev/tcp 32768 32768
tcp_recv_hiwater_def ndd/dev/tcp 32768 32768