1、用netstat查看：
1 [grid@rac121 admin]$ netstat -anp | grep oracle 2 (Not all processes could be identified, non-owned process info 3 will not be shown, you would have to be root to see it all.) 4 udp 0 0 169.254.50.253:22020 0.0.0.0:* 3825/oracle+ASM1 5 udp 0 0 127.0.0.1:56330 0.0.0.0:* 3832/oracle+ASM1 6 udp 0 0 169.254.50.253:43154 0.0.0.0:* 3645/oracle+ASM1_as 7 udp 0 0 169.254.50.253:10393 0.0.0.0:* 3618/oracle+ASM1 8 udp 0 0 169.254.50.253:42406 0.0.0.0:* 3821/oracle+ASM1 9 udp 0 0 127.0.0.1:52905 0.0.0.0:* 3645/oracle+ASM1_as 10 udp 0 0 127.0.0.1:46507 0.0.0.0:* 3618/oracle+ASM1 11 udp 0 0 169.254.50.253:57133 0.0.0.0:* 3825/oracle+ASM1 12 udp 0 0 169.254.50.253:57780 0.0.0.0:* 3832/oracle+ASM1 13 udp 0 0 169.254.50.253:39351 0.0.0.0:* 3832/oracle+ASM1 14 udp 0 0 169.254.50.253:62400 0.0.0.0:* 3641/oracle+ASM1_oc 15 udp 0 0 127.0.0.1:41171 0.0.0.0:* 3821/oracle+ASM1 16 udp 0 0 169.254.50.253:28762 0.0.0.0:* 3618/oracle+ASM1 17 udp 0 0 169.254.50.253:45412 0.0.0.0:* 3641/oracle+ASM1_oc 18 udp 0 0 127.0.0.1:50281 0.0.0.0:* 3825/oracle+ASM1 19 udp 0 0 169.254.50.253:11628 0.0.0.0:* 3821/oracle+ASM1 20 udp 0 0 169.254.50.253:25708 0.0.0.0:* 3645/oracle+ASM1_as 21 udp 0 0 127.0.0.1:25083 0.0.0.0:* 3641/oracle+ASM1_oc 22 .............. 23 unix 3 [ ] STREAM CONNECTED 350548405 - /var/tmp/.oracle/sOHASD_IPC_SOCKET_11 24 unix 3 [ ] STREAM CONNECTED 350547946 - /var/tmp/.oracle/sOHASD_IPC_SOCKET_11 25 [grid@rac121 admin]$ netstat -anp | grep 1521 26 (Not all processes could be identified, non-owned process info 27 will not be shown, you would have to be root to see it all.) 28 tcp 0 0 10.1.252.68:1521 0.0.0.0:* LISTEN 7097/tnslsnr 29 tcp 0 0 10.1.252.75:1521 0.0.0.0:* LISTEN 3880/tnslsnr 30 tcp 0 0 10.1.252.121:1521 0.0.0.0:* LISTEN 3880/tnslsnr 31 tcp 0 0 10.1.252.68:61222 10.1.252.68:1521 ESTABLISHED - 32 tcp 0 0 10.1.252.68:1521 10.1.252.122:25637 ESTABLISHED 7097/tnslsnr 33 tcp 0 0 10.1.252.68:1521 10.1.252.68:61222 ESTABLISHED 7097/tnslsnr 34 tcp 0 0 10.1.252.75:56925 10.1.252.75:1521 ESTABLISHED - 35 tcp 0 0 10.1.252.75:41069 10.1.252.75:1521 ESTABLISHED 3569/asm_pmon_+ASM1 36 tcp 0 0 10.1.252.75:1521 10.1.252.75:56925 ESTABLISHED 3880/tnslsnr 37 tcp 0 0 10.1.252.75:1521 10.1.252.75:41069 ESTABLISHED 3880/tnslsnr 38 tcp 0 0 10.1.252.75:1521 10.1.21.25:3259 ESTABLISHED - 39 [grid@rac121 admin]$
2、lsof -i :port，使用lsof -i :port就能看见所指定端口运行的程序，同时还有当前连接。
1 [grid@rac121 admin]$ lsof -i :1521 2 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME 3 oracle 3569 grid 28u IPv4 350620044 TCP rac121-vip:41069->rac121-vip:ncube-lm (ESTABLISHED) 4 tnslsnr 3880 grid 14u IPv4 350591497 TCP rac121:ncube-lm (LISTEN) 5 tnslsnr 3880 grid 15u IPv4 350591500 TCP rac121-vip:ncube-lm (LISTEN) 6 tnslsnr 3880 grid 16u IPv4 350620047 TCP rac121-vip:ncube-lm->rac121-vip:41069 (ESTABLISHED) 7 tnslsnr 3880 grid 18u IPv4 352031560 TCP rac121-vip:ncube-lm->rac121-vip:56925 (ESTABLISHED) 8 tnslsnr 7097 grid 14u IPv4 351091605 TCP rac-scan:ncube-lm (LISTEN) 9 tnslsnr 7097 grid 15u IPv4 352028561 TCP rac-scan:ncube-lm->rac122:25637 (ESTABLISHED) 10 tnslsnr 7097 grid 16u IPv4 352028634 TCP rac-scan:ncube-lm->rac-scan:61222 (ESTABLISHED) 11 [grid@rac121 admin]$
3、nmap 端口扫描
1 [grid@rac121 admin]$ nmap 10.1.252.121 2 3 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-06-29 16:41 CST 4 Interesting ports on rac121 (10.1.252.121): 5 Not shown: 1671 closed ports 6 PORT STATE SERVICE 7 21/tcp open ftp 8 22/tcp open ssh 9 53/tcp open domain 10 111/tcp open rpcbind 11 852/tcp open unknown 12 1521/tcp open oracle 13 1522/tcp open rna-lm 14 1523/tcp open cichild-lm 15 8888/tcp open sun-answerbook 16 17 Nmap finished: 1 IP address (1 host up) scanned in 0.142 seconds 18 [grid@rac121 admin]$
4、文件/etc/services显示的各个服务的端口号:
1 [grid@rac121 admin]$ cat /etc/services | grep 1521 2 ncube-lm 1521/tcp # nCube License Manager 3 ncube-lm 1521/udp # nCube License Manager 4 [grid@rac121 admin]$ cat /etc/services | grep oracle 5 oracle-oms 1159/tcp # Oracle OMS 6 oracle-oms 1159/udp # Oracle OMS 7 tlisrv 1527/tcp # oracle 8 tlisrv 1527/udp # oracle 9 oraclenames 1575/tcp # oraclenames 10 oraclenames 1575/udp # oraclenames 11 oraclenet8cman 1630/tcp # Oracle Net8 Cman 12 oraclenet8cman 1630/udp # Oracle Net8 Cman 13 oracle-em1 1748/tcp # oracle-em1 14 oracle-em1 1748/udp # oracle-em1 15 oracle-em2 1754/tcp # oracle-em2 16 oracle-em2 1754/udp # oracle-em2 17 oracle-vp2 1808/tcp # Oracle-VP2 18 oracle-vp2 1808/udp # Oracle-VP2 19 oracle-vp1 1809/tcp # Oracle-VP1 20 oracle-vp1 1809/udp # Oracle-VP1 21 oracle 2005/udp 22 [grid@rac121 admin]$