netstat -a command
The netstat -a command shows the state of all sockets.
Without the -a flag, sockets used by server processes are not shown.
For example:
# netstat -a
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 *.daytime *.* LISTEN
tcp 0 0 *.ftp *.* LISTEN
tcp 0 0 *.telnet *.* LISTEN
tcp4 0 0 *.time *.* LISTEN
tcp4 0 0 *.sunrpc *.* LISTEN
tcp 0 0 *.exec *.* LISTEN
tcp 0 0 *.login *.* LISTEN
tcp 0 0 *.shell *.* LISTEN
tcp4 0 0 *.klogin *.* LISTEN
tcp4 0 0 *.kshell *.* LISTEN
tcp 0 0 *.netop *.* LISTEN
tcp 0 0 *.netop64 *.* LISTEN
tcp4 0 1028 brown10.telnet remote_client.mt.1254 ESTABLISHED
tcp4 0 0 *.wsmserve *.* LISTEN
udp4 0 0 *.daytime *.*
udp4 0 0 *.time *.*
udp4 0 0 *.sunrpc *.*
udp4 0 0 *.ntalk *.*
udp4 0 0 *.32780 *.*
Active UNIX domain sockets
SADR/PCB Type Recv-Q Send-Q Inode Conn Refs Nextref Addr
71759200 dgram 0 0 13434d00 0 0 0 /dev/SRC
7051d580
71518a00 dgram 0 0 183c3b80 0 0 0 /dev/.SRC-unix/SRCCwfCEb
You can view detailed information for each socket with the netstat -ao command.
In the following example, the ftp socket runs over a Gigabit
Ethernet adapter configured for jumbo frames:
# netstat -ao
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
[...]
tcp4 0 0 server1.ftp client1.33122 ESTABLISHED
so_options: (REUSEADDR|OOBINLINE)
so_state: (ISCONNECTED|PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:134220 lowat:33555 mbcnt:0 mbmax:536880
rcvbuf:
hiwat:134220 lowat:1 mbcnt:0 mbmax:536880
sb_flags: (WAIT)
TCP:
mss:8948 flags: (NODELAY|RFC1323|SENT_WS|RCVD_WS|SENT_TS|RCVD_TS)
tcp4 0 0 server1.telnet sig-9-49-151-26..2387 ESTABLISHED
so_options: (REUSEADDR|KEEPALIVE|OOBINLINE)
so_state: (ISCONNECTED|NBIO)
timeo:0 uid:0
so_special: (NOUAREA|LOCKBALE|EXTPRIV|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4125 mbcnt:0 mbmax:65536
sb_flags: (SEL|NOINTR)
rcvbuf:
hiwat:66000 lowat:1 mbcnt:0 mbmax:264000
sb_flags: (SEL|NOINTR)
TCP:
mss:1375
tcp4 0 925 en6host1.login en6host2.1023 ESTABLISHED
so_options: (REUSEADDR|KEEPALIVE|OOBINLINE)
so_state: (ISCONNECTED|NBIO)
timeo:0 uid:0
so_special: (NOUAREA|LOCKBALE|EXTPRIV|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:16384 mbcnt:3216 mbmax:65536
sb_flags: (SEL|NOINTR)
rcvbuf:
hiwat:130320 lowat:1 mbcnt:0 mbmax:521280
sb_flags: (SEL|NOINTR)
TCP:
mss:1448 flags: (RFC1323|SENT_WS|RCVD_WS|SENT_TS|RCVD_TS)
tcp 0 0 *.login *.* LISTEN
so_options: (ACCEPTCONN|REUSEADDR)
q0len:0 qlen:0 qlimit:1000 so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4096 mbcnt:0 mbmax:65536
rcvbuf:
hiwat:16384 lowat:1 mbcnt:0 mbmax:65536
sb_flags: (SEL)
TCP:
mss:512
tcp 0 0 *.shell *.* LISTEN
so_options: (ACCEPTCONN|REUSEADDR)
q0len:0 qlen:0 qlimit:1000 so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4096 mbcnt:0 mbmax:65536
rcvbuf:
hiwat:16384 lowat:1 mbcnt:0 mbmax:65536
sb_flags: (SEL)
TCP:
mss:512
tcp4 0 6394 brown10.telnet remote_client.mt.1254 ESTABLISHED
so_options: (REUSEADDR|KEEPALIVE|OOBINLINE)
so_state: (ISCONNECTED|NBIO)
timeo:0 uid:0
so_special: (NOUAREA|LOCKBALE|EXTPRIV|MEMCOMPRESS|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4125 mbcnt:65700 mbmax:65536
sb_flags: (SEL|NOINTR)
rcvbuf:
hiwat:16500 lowat:1 mbcnt:0 mbmax:66000
sb_flags: (SEL|NOINTR)
TCP:
mss:1375
udp4 0 0 *.time *.*
so_options: (REUSEADDR)
so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE|DISABLE)
so_special2: (PROC)
sndbuf:
hiwat:9216 lowat:4096 mbcnt:0 mbmax:36864
rcvbuf:
hiwat:42080 lowat:1 mbcnt:0 mbmax:168320
sb_flags: (SEL)
[...]
Active UNIX domain sockets
SADR/PCB Type Recv-Q Send-Q Inode Conn Refs Nextref Addr
71759200 dgram 0 0 13434d00 0 0 0 /dev/SRC
7051d580
so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE)
so_special2: (PROC)
sndbuf:
hiwat:8192 lowat:4096 mbcnt:0 mbmax:32768
rcvbuf:
hiwat:45000 lowat:1 mbcnt:0 mbmax:180000
sb_flags: (SEL)
71518a00 dgram 0 0 183c3b80 0 0 0 /dev/.SRC-unix/SRCCwfCEb7051d400
so_state: (PRIV)
timeo:0 uid:0
so_special: (LOCKBALE)
so_special2: (PROC)
sndbuf:
hiwat:16384 lowat:4096 mbcnt:0 mbmax:65536
rcvbuf:
hiwat:8192 lowat:1 mbcnt:0 mbmax:32768
sb_flags: (SEL)
[...]