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This tool aims to replace the old netune and neconf scripts, collecting and enhancing in one tool the best of both world. The typical layout for this tool is as follow:

• /etc/init.d/ifinit represents the general and only global script which contains the all different drivers configuration capabilities and the implementation of the available actions
• /etc/ifinit.conf this is the local configuration file to be sourced and lists which interface(s) to set and how (mode, speed, etc.)
• /etc/rc2.d/S68ifinit -> /etc/init.d/ifinit at which run-level must start this script

Here are little samples of usage:

# sh /tmp/ifinit -f /tmp/ifinit.conf 
Usage: ifinit [-f cf_file] {start|status|diag}
#
# sh /tmp/ifinit -f /tmp/ifinit.conf start
Setting interface hme instance 0: done
Setting network stack parameters: done
#
# sh /tmp/ifinit -f /tmp/ifinit.conf status
Local link information for interface hme instance 0:
  transceiver_inuse: 0 (0=internal_rj45_connector,1=external_mii_transceiver)
  link_status: 1 (0=down,1=up)
  link_speed: 1 (0=10Mbytes,1=100Mbytes)
  link_mode: 1 (0=half-duplex,1=full-duplex)
  carrier_errors: 0 (number_of)
  collisions: 0 (number_of)
  retry_error: 0 (number_of)
#
# sh /tmp/ifinit -f /tmp/ifinit.conf diag
Local link information for interface hme instance 0:
  transceiver_inuse: 0 (0=internal_rj45_connector,1=external_mii_transceiver)
  link_status: 1 (0=down,1=up)
  link_speed: 1 (0=10Mbytes,1=100Mbytes)
  link_mode: 1 (0=half-duplex,1=full-duplex)
  carrier_errors: 0 (number_of)
  collisions: 0 (number_of)
  retry_error: 0 (number_of)

Configuration of interface hme instance 0:
  adv_100fdx_cap: 1
  adv_100hdx_cap: 1
  adv_10fdx_cap: 1
  adv_10hdx_cap: 1
  adv_100T4_cap: 0
  adv_autoneg_cap: 1

Configuration of the network stack tunables:
  ip_forward_directed_broadcasts: 0
  ip_forward_src_routed: 0
  ip_ignore_redirect: 0
  ip_respond_to_address_mask_broadcast: 0
  ip_respond_to_echo_broadcast: 1
  ip_respond_to_timestamp: 0
  ip_respond_to_timestamp_broadcast: 0
  ip_send_redirects: 1
  ip_strict_dst_multihoming: 0
  ip_ire_arp_interval: 1200000
  tcp_xmit_hiwat: 49152
  tcp_recv_hiwat: 49152
  tcp_cwnd_max: 1048576
  tcp_rexmit_interval_max: 60000
  tcp_rexmit_interval_min: 400
  tcp_rexmit_interval_initial: 3000
  tcp_slow_start_initial: 4
  tcp_conn_req_max_q: 128
  tcp_conn_req_max_q0: 1024
  tcp_smallest_anon_port: 32768
  tcp_largest_anon_port: 65535
  tcp_smallest_nonpriv_port: 1024
  tcp_extra_priv_ports: 2049 4045 9010
  tcp_time_wait_interval: 60000
  tcp_rev_src_routes: 0
  udp_recv_hiwat: 57344
  udp_xmit_hiwat: 57344
  udp_smallest_anon_port: 32768
  udp_largest_anon_port: 65535
  udp_smallest_nonpriv_port: 1024
  udp_extra_priv_ports: 2049 4045
  arp_cleanup_interval: 300000

Please replace /tmp with /etc/init.d and /etc, accordingly.