{"id":4672,"date":"2021-11-04T16:14:12","date_gmt":"2021-11-04T07:14:12","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=4672"},"modified":"2021-11-04T16:14:12","modified_gmt":"2021-11-04T07:14:12","slug":"%ec%8b%a4%ec%8b%9c%ea%b0%84%ec%9c%bc%eb%a1%9c-tcp-%ec%99%80-udp-%ed%8f%ac%ed%8a%b8%eb%a5%bc-%ea%b0%90%ec%8b%9c%ed%95%98%eb%8a%94-%eb%b0%a9%eb%b2%95","status":"publish","type":"post","link":"http:\/\/haisins.synology.me\/wordpress\/?p=4672","title":{"rendered":"\uc2e4\uc2dc\uac04\uc73c\ub85c TCP \uc640 UDP \ud3ec\ud2b8\ub97c \uac10\uc2dc\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"
\n
\ub9ac\ub205\uc2a4 \uc6b4\uc601\uccb4\uc81c\uc5d0\uc11c \uac04\ud639 \ud3ec\ud2b8 \uac10\uc2dc\ub97c \ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/div>\n
<\/div>\n<\/div>\n
\n
\ud2b9\ud788 \ub098 TCP\ub098 UDP \ud3ec\ud2b8\uc5d0 \ub300\ud574 \uac10\uc2dc\ub97c \ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uac00 \uc788\ub2e4.<\/div>\n
<\/div>\n<\/div>\n
\n
\uc774\ub7f4 \uacbd\uc6b0 netstat \ud639\uc740 ss \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\uac8c \ub429\ub2c8\ub2e4.<\/div>\n
<\/div>\n<\/div>\n
\n
\u00a0TCP, UDP \ud3ec\ud2b8\ub97c \ub9ac\uc2a4\ub2dd \ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc774\ub098 \ud504\ub85c\uc138\uc2a4\uc5d0 \ub300\ud574\uc11c \ud655\uc778\ud558\ub294 \ubc29\ubc95 \uc785\ub2c8\ub2e4.<\/div>\n<\/div>\n
<\/div>\n
<\/div>\n
\n
ss \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0<\/strong><\/span><\/div>\n<\/div>\n
\n
<\/div>\n<\/div>\n
\n
[root@testora ~]# ss -tulpn<\/div>\n<\/div>\n
\n
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 127.0.0.1:916 *:* users:((“rpc.statd”,1588,5))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:802 *:* users:((“rpcbind”,1475,7))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:111 *:* users:((“rpcbind”,1475,6))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:13303 *:* users:((“rpc.statd”,1588,8))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 52.33.171.180:123 *:* users:((“ntpd”,1959,19))<\/div>\n<\/div>\n
\n
…<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::111 :::* users:((“rpcbind”,1475,11))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:111 *:* users:((“rpcbind”,1475,8))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::1521 :::* users:((“tnslsnr”,2827,12))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 32 *:21 *:* users:((“vsftpd”,1974,3))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::22 :::* users:((“sshd”,29428,4))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:22 *:* users:((“sshd”,29428,3))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 100 127.0.0.1:25 *:* users:((“master”,2420,12))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::5500 :::* users:((“tnslsnr”,2827,19))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:63132 *:* users:((“rpc.statd”,1588<\/div>\n<\/div>\n
<\/div>\n
<\/div>\n
\n
netstat \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0<\/strong><\/span><\/div>\n<\/div>\n
\n
<\/div>\n<\/div>\n
\n
[root@testora ~]# netstat -tulpn<\/div>\n<\/div>\n
\n
Active Internet connections (only servers)<\/div>\n<\/div>\n
\n
Proto Recv-Q Send-Q Local Address Foreign Address State PID\/Program name<\/div>\n<\/div>\n
\n
tcp 0 0 127.0.0.1:2016 0.0.0.0:* LISTEN 19084\/oraagent.bin<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1475\/rpcbind<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 1974\/vsftpd<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 29428\/sshd<\/div>\n<\/div>\n
\n
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2420\/master<\/div>\n<\/div>\n
\n
…<\/div>\n<\/div>\n
\n
udp 0 0 ::1:59862 :::* 3035\/ora_d000_testd<\/div>\n<\/div>\n
\n
udp 0 0 :::23526 :::* 2987\/ora_pmon_testd<\/div>\n<\/div>\n
\n
udp 0 0 :::111 :::* 1475\/rpcbind<\/div>\n<\/div>\n
\n
udp 0 0 ::1:20986 :::* 2483\/ohasd.bin<\/div>\n<\/div>\n
\n
udp 0 0 fe80::ea11:32ff:fe81:ecb:123 :::* 1959\/ntpd<\/div>\n<\/div>\n
\n
udp 0 0 ::1:123 :::* 1959\/ntpd<\/div>\n<\/div>\n
\n
udp 0 0 :::123 :::* 1959\/ntpd<\/div>\n<\/div>\n
\n
[root@testora ~]#<\/div>\n
<\/div>\n<\/div>\n
\n
ss\uc640 netstat \uba85\ub839\uc5b4\uc5d0\uc11c \uc0ac\uc6a9\ud55c \uc635\uc158\uc758 \uae30\ub2a5\uc740 \uc544\ub798\uc640 \uac19\uc2b5\ub2c8\ub2e4.<\/div>\n
<\/div>\n<\/div>\n
\n
-t : TCP \ud3ec\ud2b8\ub97c \ud655\uc778<\/strong><\/span><\/div>\n<\/div>\n
\n
-u : UDP \ud3ec\ud2b8\ub97c \ud655\uc778<\/strong><\/span><\/div>\n<\/div>\n
\n
-l : \ub9ac\uc2a4\ub2dd\ud558\uace0 \uc788\ub294 \uc18c\ucf13\uc744 \ubcf4\uc5ec\uc90c<\/strong><\/span><\/div>\n<\/div>\n
\n
-n : \ud3ec\ud2b8 \ub118\ubc84\ub97c \ubcf4\uc5ec\uc90c<\/strong><\/span><\/div>\n<\/div>\n
\n
-p : \ud504\ub85c\uc138\uc2a4\ub098 \ud504\ub85c\uadf8\ub7a8\uba85\uc744 \ubcf4\uc5ec\uc90c<\/strong><\/span><\/div>\n<\/div>\n
<\/div>\n
<\/div>\n
\n
#. \uba85\ub839\uc5b4\ub97c \ud1b5\ud574 \uc2e4\uc2dc\uac04 \ubaa8\ub2c8\ud130\ub9c1\uc744 \ud558\ub294 \ubc29\ubc95<\/strong><\/span><\/div>\n
<\/div>\n<\/div>\n
\n
\uc2e4\uc2dc\uac04 \ubaa8\ub2c8\ud130\ub9c1\uc5d0\ub294 watch<\/strong> \ub780 \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9 \ud569\ub2c8\ub2e4.<\/div>\n
<\/div>\n<\/div>\n
\n
\uba85\ub839\uc5b4\ub294 \uc704\uc5d0 \uc0ac\uc6a9\ud55c \uba85\ub839\uc5b4 \uc55e\uc5d0 watch \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud574 \uc8fc\uba74 \ub429\ub2c8\ub2e4.<\/div>\n<\/div>\n
\n
<\/div>\n<\/div>\n
\n
watch ss -tulpn<\/strong><\/div>\n<\/div>\n
\n
or<\/div>\n<\/div>\n
\n
watch netstat -tulpn<\/strong><\/div>\n
<\/div>\n<\/div>\n
\n
\ud130\ubbf8\ub110 \uc804\uccb4 \ud654\uba74\uc73c\ub85c \uc544\ub798\uc640 \uac19\uc740 \uacb0\uacfc\uac00 2\ucd08\ub9c8\ub2e4 \ub9ac\ud504\ub808\uc2dc \ub429\ub2c8\ub2e4.<\/div>\n<\/div>\n
<\/div>\n
<\/div>\n
\n
#. watch \uc640 ss \uba85\ub839\uc5b4\ub97c \uac19\uc774 \uc0ac\uc6a9\ud55c \uacbd\uc6b0<\/strong><\/span><\/div>\n<\/div>\n
<\/div>\n
<\/div>\n
\n
Every 2.0s: ss -tulpn <\/strong><\/div>\n
<\/div>\n
Wed Feb 5 14:46:40 2020<\/div>\n<\/div>\n
\n
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 127.0.0.1:916 *:* users:((“rpc.statd”,1588,5))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:802 *:* users:((“rpcbind”,1475,7))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:111 *:* users:((“rpcbind”,1475,6))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:13303 *:* users:((“rpc.statd”,1588,8))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 52.33.171.180:123 *:* users:((“ntpd”,1959,19))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 127.0.0.1:123 *:* users:((“ntpd”,1959,18))<\/div>\n<\/div>\n
\n
udp UNCONN 0 0 *:123 *:* users:((“ntpd”,1959,16))<\/div>\n<\/div>\n
\n
…<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:111 *:* users:((“rpcbind”,1475,8))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::1521 :::* users:((“tnslsnr”,2827,12))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 32 *:21 *:* users:((“vsftpd”,1974,3))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::22 :::* users:((“sshd”,29428,4))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:22 *:* users:((“sshd”,29428,3))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 100 127.0.0.1:25 *:* users:((“master”,2420,12))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 :::5500 :::* users:((“tnslsnr”,2827,19))<\/div>\n<\/div>\n
\n
tcp LISTEN 0 128 *:63132 *:* users:((“rpc.statd”,1588,9))<\/div>\n<\/div>\n
\n
<\/div>\n
<\/div>\n
#. watch\uc640 netstat \uba85\ub839\uc5b4\ub97c \uac19\uc774 \uc0ac\uc6a9\ud55c \uacbd\uc6b0<\/strong><\/span><\/div>\n<\/div>\n
<\/div>\n
\n
Every 2.0s: netstat -tulpn <\/strong><\/div>\n
<\/div>\n
Wed Feb 5 14:49:04 2020<\/div>\n<\/div>\n
\n
Active Internet connections (only servers)<\/div>\n<\/div>\n
\n
Proto Recv-Q Send-Q Local Address Foreign Address State PID\/Program name<\/div>\n<\/div>\n
\n
tcp 0 0 127.0.0.1:2016 0.0.0.0:* LISTEN 19084\/oraagent.bin<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1475\/rpcbind<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 1974\/vsftpd<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 29428\/sshd<\/div>\n<\/div>\n
\n
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2420\/master<\/div>\n<\/div>\n
\n
tcp 0 0 0.0.0.0:63132 0.0.0.0:* LISTEN 1588\/rpc.statd<\/div>\n<\/div>\n
\n
tcp 0 0 :::13982 :::* LISTEN 3035\/ora_d000_testd<\/div>\n<\/div>\n
\n
…<\/div>\n<\/div>\n
\n
udp 0 0 :::802 :::* 1475\/rpcbind<\/div>\n<\/div>\n
\n
udp 0 0 ::1:47535 :::* 3039\/ora_s000_testd<\/div>\n<\/div>\n
\n
udp 0 0 :::55602 :::* 1588\/rpc.statd<\/div>\n<\/div>\n
\n
udp 0 0 ::1:19397 :::* 2915\/asm_lreg_+ASM<\/div>\n<\/div>\n
\n
udp 0 0 ::1:59862 :::* 3035\/ora_d000_testd<\/div>\n<\/div>\n
\n
udp 0 0 :::23526 :::* 2987\/ora_pmon_testd<\/div>\n<\/div>\n
\n
udp 0 0 :::111 :::* 1475\/rpcbind<\/div>\n<\/div>\n
\n
udp 0 0 ::1:20986 :::* 2483\/ohasd.bin<\/div>\n<\/div>\n
\n
udp 0 0 fe80::ea11:32ff:fe81:ecb:123 :::* 1959\/ntpd<\/div>\n<\/div>\n
\n
udp 0 0 ::1:123 :::* 1959\/ntpd<\/div>\n<\/div>\n
\n
udp 0 0 :::123 :::* 1959\/ntpd<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\ub9ac\ub205\uc2a4 \uc6b4\uc601\uccb4\uc81c\uc5d0\uc11c \uac04\ud639 \ud3ec\ud2b8 \uac10\uc2dc\ub97c \ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uac00 \uc788\uc2b5\ub2c8\ub2e4. \ud2b9\ud788 \ub098 TCP\ub098 UDP \ud3ec\ud2b8\uc5d0 \ub300\ud574 \uac10\uc2dc\ub97c \ud574\uc57c \ud558\ub294 \uacbd\uc6b0\uac00 \uc788\ub2e4. \uc774\ub7f4 \uacbd\uc6b0 netstat \ud639\uc740 ss \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\uac8c \ub429\ub2c8\ub2e4. \u00a0TCP, UDP \ud3ec\ud2b8\ub97c \ub9ac\uc2a4\ub2dd \ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc774\ub098 \ud504\ub85c\uc138\uc2a4\uc5d0 \ub300\ud574\uc11c \ud655\uc778\ud558\ub294 \ubc29\ubc95 \uc785\ub2c8\ub2e4. ss \uba85\ub839\uc5b4\ub97c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 [root@testora ~]# ss -tulpn Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port […]<\/p>\n","protected":false},"author":1,"featured_media":2428,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"categories":[336],"tags":[1251,409,448,1250,1247,332,1249,1248],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/haisins.synology.me\/wordpress\/wp-content\/uploads\/2018\/01\/Bull-cyber-Data-encryption-1.jpg?fit=538%2C303","amp_enabled":true,"_links":{"self":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4672"}],"collection":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4672"}],"version-history":[{"count":1,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4672\/revisions"}],"predecessor-version":[{"id":4673,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4672\/revisions\/4673"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/2428"}],"wp:attachment":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4672"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}