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ÀHµÛInternetªº¨³²rµo®i¡Aºô¸ô¤wµL³B¤£¦b¡A¦ý¬O¡A¥¦¥i¯àÀH®É¨ü¨ì¨Ó¦Û¦U¤èªº§ðÀ»¡CÁA¸Ñþ¨Ç¤H¥¿¦b³X°Ý¸ê·½¡Bþ¨Ç¤H¥¿¦b¨É¨üªA°È¡Bþ¨Ç¤H¥¿¦bµo°e¤j¶q©U§£µ¥¡A¹ïºô¸ôºÞ²zû¨Ó»¡¬O«D±`¥²nªº¡C§Q¥Îlinux¤¤¸û±`¨£ªººô¸ô¤ÀªR¤u¨ãTcpdump¡BNmap©MNetstat¡A¥i¥H¨Ïºô¸ôºÞ²z¤u§@§ó¥[»´ÃP¡C
Tcpdump¥Dn¬OºIÀò³q¹L¥»¾÷ºô¸ô¤¶±ªº¸ê®Æ¡A¥Î¥H¤ÀªR¡CNmap¬O±j¤jªº°ð±½´y¤u¨ã¡A¥i±½´y¥ô¦ó¥D¾÷©Îºô¸ô¡CNetstat¥i¥Î¨ÓÀˬd¥»¾÷·í«e´£¨ÑªºªA°È¤Îª¬ºA¡C³o¤TªÌ¦U¦³©Òªø¡Aµ²¦X°_¨Ó¡A´N¥i¥H¤ñ¸û³z¹ý¦aÁA¸Ñºô¸ôª¬ªp¡C
Tcpdump
Tcpdump¯à°÷ºIÀò·í«e©Ò¦³³q¹L¥»¾÷ºô¥dªº¸ê®Æ¥]¡C¥¦¾Ö¦³ÆF¬¡ªº¹LÂo¾÷¨î¡A¥i¥H½T«O±o¨ì·Qnªº¸ê®Æ¡C¥Ñ©óTcpdump¥u¯à¦¬¶°³q¹L¥»¾÷ªº¸ê®Æ¡A¦]¦¹¥¦ªºÀ³¥Î¨ü¨ì¤F¤@¨Ç¨î¡A¤j¦hÀ³¥Î¦b¹h¹D©Î¦øªA¾¹¦Û§ÚÀË´ú¤W¡C¨Ò¦p¡A¦b§@¬°¹h¹Dªº¥D¾÷¤W¡A·Qª¾¹D¥»¦aºô¸ô¤¤IP¦ì§}¬°192.168.0.5ªº¥D¾÷²{¦b»P¥~¬É³q«Hªº±¡ªp¡A´N¥i¥H¨Ï¥Î¦p¤U©R¥O¡G
tcpdump -i eth0 src host 192.168.0.5
¦bÀq»{±¡ªp¤U¡ATcpdump·|±N¸ê®Æ¿é¥X¨ì¿Ã¹õ¡C¦pªG¸ê®Æ¶q¤Ó¤j¡A¥i¯à®Ú¥»¬Ý¤£²M¨ãÅ骺¤º®e¡A³o®É§ÚÌ¥i¥H§â¥¦«©w¦V¨ìÀɦA¶i¦æ¤ÀªR¡C¦pªG²´¯«¤£¿ù¡A´N¥i¥H²M·¡¦aÁA¸Ñ³o¦ì¤¯¥Sè¤~ªº¤@Á|¤@°Ê¡G
³X°Ý¤F·s®öºô¥D¶
20:05:32.473388 192.168.0.5.1872 > www.sina.com.http:
S 1372301404:1372301404(0) win 64240 <mss
1460,nop,nop,sackOK> (DF)
¡K¡K
¶i¦æ¤Fnetbios¼s¼½¶i¦æ¦W¦r¬d¸ß
20:05:33.823388 192.168.0.5.netbios-dgm >
192.168.0.255.netbios-dgm: NBT UDP PACKET(138)
¡K¡K
¨ì·sµØºôPOP3¦øªA¾¹¦¬«H
20:05:41.953388 192.168.0.5.1878 > pop.xinhuanet.com.pop3: S
1374956462:1374956462(0) win 64240 <mss 1460,nop,nop,sackOK> (DF)
¡K¡K
¨ì²`¦`963¦¬«H
20:05:45.633388 192.168.0.5.1881 > szptt154.szptt.net.cn.pop3:
P 34:40(6) ack 146 win 64095 (DF)
¡K¡K
¨Ò¦p¡A¤W±³o±ø¸ê°Tªí©ú¤F¦b20:05:45ªº®ÉÔ¡A192.168.0.5³q¹L1881·½°ð³s±µ¨ì963¹q¤l¶l§½ªºPOP3°ð¡C¹ï©ó´¶³qªººô¸ô¤ÀªR¡A³o¨Ç¸ê°T¤w¸g¨¬°÷¤F¡C³o´N¬OTcpdumpªº°ò¥»¥\¯à¡A¨ä¥L°ª¯Å¥\¯à³£¬O¦b³o¤@°ò¦¤Wªº²Ó¤Æ©M¼W±j¡C
¨Ò¦p¡A§Ú¥u·Qª¾¹D192.168.0.5·í«e¥¿¦b³X°Ýþ¨ÇWeb¯¸ÂI¡A¥i¥H¥Î¤U±³o±ø©R¥O¡G
tcpdump -i eth0 src host 192.168.0.5 and dst port 80
¸Ó©R¥Oªº¥Øªº¬OºIÀò©Ò¦³¥Ñeth0¶i¤J¡B·½¦ì§}(src)¬°192.168.0.5ªº¥D¾÷(host)¡A¨Ã¥B(and)¥Ø¼Ð(dst)°ð(port)¬°80ªº¼Æ¾Ú¥]¡C±o¨ìªº¸ê®Æ¦p¤U¡G
20:05:32.473388 192.168.0.5.1872 > www.sina.com.http:
S 1372301404:1372301404(0) win 64240 <mss 1460,nop,nop,sackOK> (DF)
¡K¡K
20:06:33.42344 192.168.0.5.1873 > www.sohu.com.http:
S 1374301404:1374301404(0) win 64245 <mss 1460,nop,nop,sackOK> (DF)
¡K¡K
20:07:31.343248 192.168.0.5.1874 > www.21cn.com.http:
S 1377301404:1377301404(0) win 64241 <mss 1460,nop,nop,sackOK> (DF)
¡K¡K
ÅãµM¡A³q¹Land©ÎªÌnot³o¨ÇÅÞ¿è²Õ¦X¡A´N¥i¥H±o¨ì¯S©wªº¸ê®Æ¡CTcpdumpÁÙ¥i¥HºÊÅ¥¤£¦Pªº¸ê®ÆÃþ«¬¡]¦pTCP¡BUDP¡^¡A¥H¥Î¤£¦Pªººô¸ô½d³ò¡]¦pHost¥D¾÷¡BNetºô¸ô¡^¡A¬Æ¦Ü¥ÎEtherª½±µ«ü©wª«²z¦ì§}¡C
¥ÎTcpdump¦bºô¸ô¤¤Àò¨ú¸ê°T¦p¦¹²M´·¡A¬O¤£¬O¦³¤@ºØ¤@ÄýµL¾lªº·Pı¡C¥¿¬O¦]¬°Tcpdump¥\¯à¹L©ó±j¤j¡A³sÓ¤HÁô¨p©M±Ó·P¸ê®Æªº«OÅ@³£¦¨¤F°ÝÃD¡A©Ò¥H³q±`¥u¦³root¥Î¤á¯à°÷¨Ï¥Î³o¤@¤u¨ã¡C
Nmap
Nmap³]pªºªì°J¬O¨t²ÎºÞ²zû¥i¥H¤è«K¦aÁA¸Ñ¦Û¤vªººô¸ô¹B¦æ±¡ªp¡A¨Ò¦p¦³¦h¤Ö¥x¥D¾÷¦b¹B¦æ¡B¤À§O´£¨Ñ¤°»ò¼ËªºªA°È¡C¦]¦¹¡A¥¦±½´yªº³t«×«D±`§Ö¡A¤×¨ä¾A¦X¤j«¬ºô¸ô¡C¦b¹ïºô¸ô¶i¦æ±½´y®É¡ANmap¥Dn§Q¥ÎICMP echo±´´ú¥D¾÷¬O§_¶}±Ò¡C¤Z¬OÁA¸ÑTCP/IP¨óijªº³£ª¾¹D¡A¹ï©ó¤@ÓTCP°ð¡AµL½×¬O§_¨Ï¥Î¨¾¤õÀð¶i¦æ¹LÂo¡A¸Ó¥D¾÷³£·|¹ï¸Ó°ðµo¥Xªº½Ð¨D°µ¥X¤@©w¦^À³¡C©Ò¥H§Y¨Ï°t¸m¤FÄY®æªº¨¾¤õÀð³W«h¡Anmap·Ó¼Ë¥i¥H§ä¨ì³o¨Ç¥D¾÷¡C¨Ò¦p¡A¦b¤@¥xIP¦ì§}¬°192.168.0.1ªºlinux¥D¾÷¤W°õ¦æ¤U¦C©R¥O¡G
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
¥¦ªº§@¥Î´N¬O¹ï©Ò¦³ICMP echo¤£¤©²z¸B¡A¤]´N¬OÅý³q±`¥Î¨Ó´ú¸Õºô¸ôªºPing©R¥O¥¢®Ä¡C³o¼Ë¦Ü¤Ö¥i¥H©è¾×POD(Ping of Death)ªº§ðÀ»¡C¦b¥ô¦ó¤@¥x¾÷¾¹¤WPing³o¥x¥D¾÷¡A±o¨ìªº³£·|¬O½Ð¨D¶W®É¡A¦p¡G
Pinging 192.168.0.1 with 32 bytes of data:
Request timed out.
Request timed out.Request timed out.Request timed out.
Ping statistics for 192.168.0.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)
³o¥x¥D¾÷¬O§_¤U½u¤F¡H¥ÎNmap±´´ú¸Õ¸Õ¬Ý¡G
nmap -sP 192.168.0.1
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Host gw.somewhere.net (192.168.0.1) appears to be up.
±´´úµ²ªG¦n¹³¸Ó¥D¾÷ÁÙ¶}µÛ©O¡I³oùØ¡A-sP«ü©w¨Ï¥ÎPing echo ¶i¦æ±½´y(Scan)¡C
§Q¥Î³o¤@¯SÂI¡A¥i¥H«Ü§Öª¾¹D¥Øªººô¸ô¨s³º¦³¦h¤Ö¥D¾÷³B©ó¹B¦æª¬ºA¡G
nmap -sP 192.168.0.0/24 //24ªí©ú¥Ø¼Ð¬O¤@Óºô¸ô¦Ó«D³æÓ¥D¾÷
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Host (192.168.0.2) appears to be up.
Host www.somesite.net (192.168.0.5) appears to be up.
Host (192.168.0.8) appears to be up.
¡K¡K
Host (192.168.0.253) appears to be up.
Host fake.somesite.net (192.168.0.254) appears to be up.
Nmap run completed -- 256 IP addresses (19 hosts up) scanned in 6 seconds
¬JµM¤w¸gª¾¹D¤Fþ¨Ç¥D¾÷ÁÙ¶}µÛ¡A´N¥i¥H¶i¤@¨B±´´ú³o¨Ç¥D¾÷ªº¸ê°T¡A¦p¶}±Òªº°ð¡B´£¨ÑªºªA°È¤Î§@·~¨t²ÎÃþ«¬µ¥¡C±q¤W±±½´yªºµ²ªG¥i¥Hª¾¹D¡A192.168.0.5³o¥x¾÷¾¹¥¿¦b¹B¦æ¡C·QnÁA¸Ñ¸Ó¥D¾÷ªº¸Ô²Ó¸ê°T¡A¥i¥H°õ¦æ¡G
nmap 192.168.0.5
µy«á·|Åã¥Ü¦p¤U¤º®e¡G
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on www.somewhere.net (192.168.0.5):
(The 1537 ports scanned but not shown below are in state: closed)
Port State Service
80/tcp open http
135/tcp open loc-srv
139/tcp open netbios-ssn
443/tcp open https
1031/tcp open iad2
1433/tcp open ms-sql-s
Nmap run completed -- 1 IP address (1 host up) scanned in 0 seconds
¥Ñ¤W¥i¥HÂ_©w¡A³o¬O¤@¥x¹B¦æWindows§@·~¨t²Îªº¥D¾÷¡A¦]¬°¥¦¶}±Ò¤FMS SQL Serverªº±M¥Î°ð1433¡AÁÙ´£¨Ñ¤FHTTPªA°Èµ¥¡C³o¨Ç¸ê°T¦pªG³Q¤£Ãh¦n·Nªº¤H±o¨ì¡A´N¥i¥H±Ä¥Î¹ïÀ³ªº§ðÀ»¿ìªk¡C¨ä¹ê¡A±j¤jªºNmap¥»¨´N¥i¥H¨Ì¾ÚTCP/IPªº«ü¯¾¯S¼x²q´ú¹ï¤è¨Ï¥Îªº§@·~¨t²Î¡C§ÚÌ¥i¥H¥Î-O¨Ó¶}±Ò³o¤@¿ï¶µ¡G
nmap -O 192.168.0.5
±o¨ìªºµ²ªG¬O¡G
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on www.somewhere.net (192.168.0.5):
(The 1536 ports scanned but not shown below are in state: closed)
Port State Service
80/tcp open http
135/tcp open loc-srv
139/tcp open netbios-ssn
443/tcp open https
1032/tcp open iad3
1433/tcp open ms-sql-s
Remote operating system guess: Microsoft NT 4.0 Server SP5 + 2047 Hotfixes
Nmap run completed -- 1 IP address (1 host up) scanned in 2 seconds
¥¦²q´úªº»·ºÝ¥D¾÷Ãþ«¬¬OMicrosoft NT 4.0 Server SP5 + 2047 Hotfixes¡A¨Ã¥B¬Û·í·Ç½T©M¸ÔºÉ¡C
Netstat
Netstat¥Dn¥Î©ólinux/Unix¥D¾÷¹î¬Ý¦Û¨ªººô¸ôª¬ªp¡A¦p¶}±Òªº°ð¡B¦b¬°þ¨Ç¥Î¤áªA°È¥H¤ÎªA°Èªºª¬ºAµ¥µ¥¡C¦¹¥~¡A¥¦ÁÙÅã¥Ü¨t²Î¸ô¥Ñªí¡Bºô¸ô¤¶±ª¬ºAµ¥¡C¥i¥H»¡¡A¥¦¬O¤@Óºî¦X©Êªººô¸ôª¬ºA¹î¬Ý¤u¨ã¡A¤£¹L¤¤³W¤¤Á|¡C
¨Ò¦p¦b¤@¥x´¶³qlinux¦øªA¾¹¤W¹B¦æNetstat¡AÅã¥Ü¥i¯à¹³³o¼Ë¡G
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 xxx.net.http-alt xxx.net:1209 ESTABLISHED
tcp 0 0 xxx.net.http-alt xxx.net:1509 ESTABLISHED
tcp 0 0 xxx.net.ssh whoami.net:1867 ESTABLISHED
tcp 0 0 xxx.net:1209 xxx.net.http-alt ESTABLISHED
tcp 0 0 xxx.net:1509 xxx.net.http-alt ESTABLISHED
Active UNIX domain sockets (w/o servers)
Proto RefCnt Flags Type State I-Node Path
unix 8 [ ] DGRAM 858 /dev/log
unix 2 [ ] DGRAM 190986
unix 2 [ ] DGRAM 190051
unix 2 [ ] DGRAM 1252
unix 2 [ ] DGRAM 1233
unix 2 [ ] DGRAM 1049
unix 2 [ ] DGRAM 867
unix 2 [ ] STREAM CONNECTED 507
¤U¥b³¡¤À³QºÙ§@Unix°ì®M¤¶±¡A³q±`¤£¥²¦b·N¡C¦³¥Îªº¬O¤W¥b³¡³QºÙ¬°¦³·½TCP³s±µªº³¡¤À¡A¥¦Åã¥Ü¤F·í«e©Ò¦³¤w«Ø¥ßªº³s±µ¡C¥Ñ¦¹¤£Ãø¬Ý¥X¡A·í«e³o¥x¦øªA¾¹»P¥D¾÷myself.net¦³¤@¨Ç³B©ó¥bÃö³¬ª¬ºAªºHTTP³s±µ¡AÁÙ»P¥D¾÷whoami.net¦³¤@ÓSSH³s±µ¡C
¦bÀq»{±¡ªp¤U¡ANetstat¥uÅã¥Ü¤w«Ø¥ß³s±µªº°ð¡CnÅã¥Ü³B©óºÊÅ¥ª¬ºAªº©Ò¦³°ð¡A¨Ï¥Î-a°Ñ¼Æ§Y¥i¡G
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:http-alt *:* LISTEN
tcp 0 0 *:8009 *:* LISTEN
tcp 0 0 *:mysql *:* LISTEN
tcp 0 0 *:netbios-ssn *:* LISTEN
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:ftp *:* LISTEN
tcp 0 0 xxx.net.http-alt xxx.net:1209 ESTABLISHED
tcp 0 0 xxx.net.http-alt xxx.net:1509 ESTABLISHED
tcp 0 0 xxx.net.ssh myself.net:1867 ESTABLISHED
tcp 0 0 xxx.net:1209 xxx.net.http-alt ESTABLISHED
tcp 0 0 xxx.net:1509 xxx.net.http-alt ESTABLISHED
¡K¡K
³o¼Ë¡A·í«e¥¿¦bºÊÅ¥¦ý¨Ã¥¼«Ø¥ß³s±µªº°ð¤]¥i¥HÅã¥Ü¤F¥X¨Ó¡C¥Ñ¦¹¤£Ãø¬Ý¥X¡A³o¥x¦øªA¾¹¦P®É´£¨ÑHTTP¡BFTP¡BSSH¡BNMBD¤Î¤@ÓMySQL¸ê®Æ®wªA°È¡C
NetstatÁÙ¥i¥H¤è«K¦a¥N´Àroute©R¥OÅã¥Ü·í«e®Ö¤ß¸ô¥Ñªí¡G
netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
218.208.80.176 * 255.255.255.248 U 40 0 0 eth1
192.168.0.0 * 255.255.255.0 U 40 0 0 eth0
127.0.0.0 * 255.0.0.0 U 40 0 0 lo
default x.x.x.x 0.0.0.0 UG 40 0 0 eth1
¥H¤Wµ²ªG»ProuteÅã¥Ü§¹¥þ¤@¼Ë¡C
¦¹¥~¡A¥¦ÁÙ¥i¥H¥N´ÀifconfigÅã¥Üºô¸ô¤¶±ª¬ºA¡G
netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 3441803 0 0 0 3717339 0 0 0 BMRU
eth0: 1500 0 - no statistics available - BMRU
eth0: 1500 0 - no statistics available - BMRU
eth1 1500 0 1770949 0 0 0 1496183 0 0 0 BMRU
lo 16436 0 38255 0 0 0 38255 0 0 0 LRU
¥H¤W³o¨Çªí©ú¡A§Q¥Îºô¸ô¤ÀªR¤u¨ãÁA¸Ñºô¸ôªºª¬ªp«D±`²³æ¡A´X¥G¤£¶O¤°»ò¤O®ð´N¥i¥HÀò¨ú«Ü¦h¦³¥Îªº¸ê®Æ¡C
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