NDD 로 system value 변경

ndd /dev/arp ₩?
ndd /dev/ip ₩?
ndd /dev/tcp ₩?
ndd /dev/udp ₩?

[root@jin:/nfsroot/kctc/shlee_dcnc]# ndd /dev/udp \?
?                             (read only)
udp_wroff_extra               (read and write)
udp_ipv4_ttl                  (read and write)
udp_ipv6_hoplimit             (read and write)
udp_smallest_nonpriv_port     (read and write)
udp_do_checksum               (read and write)
udp_smallest_anon_port        (read and write)
udp_largest_anon_port         (read and write)
udp_xmit_hiwat                (read and write)
udp_xmit_lowat                (read and write)
udp_recv_hiwat                (read and write)
udp_max_buf                   (read and write)
udp_ndd_get_info_interval     (read and write)
udp_extra_priv_ports          (read only)
udp_extra_priv_ports_add      (write only)
udp_extra_priv_ports_del      (write only)
udp_status                    (read only)
udp_bind_hash                 (read only)

[root@jin:/nfsroot/kctc/shlee_dcnc]# ndd -get /dev/udp udp_recv_hiwat
512000
* default 는 57344byte
[root@jin:/nfsroot/kctc/shlee_dcnc]# ndd -get /dev/udp udp_xmit_hiwat
57344