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This really, really, had me pulling my hair out all day trying to configure the iptables of my VPS...
Testing from my laptop with nmap, *everyting* seems open! No matter if the domain doesn't even exist!
nmap -PN 1.2.3.4
Starting Nmap 5.21 ( http://nmap.org ) at 2010-07-28 16:59 BST
Nmap scan report for 1.2.3.4
Host is up (0.0015s latency).
PORT STATE SERVICE
1/tcp open tcpmux
3/tcp open compressnet
4/tcp open unknown
6/tcp open unknown
7/tcp open echo
9/tcp open discard
13/tcp open daytime
17/tcp open qotd
19/tcp open chargen
20/tcp open ftp-data
21/tcp open ftp
22/tcp open ssh
23/tcp open telnet
24/tcp open priv-mail
25/tcp open smtp
26/tcp open rsftp
30/tcp open unknown
32/tcp open unknown
33/tcp open dsp
37/tcp open time
42/tcp open nameserver
43/tcp open whois
49/tcp open tacacs
53/tcp open domain
70/tcp open gopher
79/tcp open finger
80/tcp open http
81/tcp open hosts2-ns
82/tcp open xfer
83/tcp open mit-ml-dev
84/tcp open ctf
85/tcp open mit-ml-dev
88/tcp open kerberos-sec
89/tcp open su-mit-tg
90/tcp open dnsix
99/tcp open metagram
100/tcp open newacct
106/tcp open pop3pw
109/tcp open pop2
110/tcp open pop3
111/tcp open rpcbind
113/tcp open auth
119/tcp open nntp
125/tcp open locus-map
135/tcp open msrpc
139/tcp open netbios-ssn
143/tcp open imap
144/tcp open news
146/tcp open iso-tp0
161/tcp open snmp
163/tcp open cmip-man
179/tcp open bgp
199/tcp open smux
211/tcp open 914c-g
212/tcp open anet
222/tcp open rsh-spx
254/tcp open unknown
255/tcp open unknown
256/tcp open fw1-secureremote
259/tcp open esro-gen
264/tcp open bgmp
280/tcp open http-mgmt
301/tcp open unknown
306/tcp open unknown
311/tcp open asip-webadmin
340/tcp open unknown
366/tcp open odmr
389/tcp open ldap
406/tcp open imsp
407/tcp open timbuktu
416/tcp open silverplatter
417/tcp open onmux
425/tcp open icad-el
427/tcp open svrloc
443/tcp open https
444/tcp open snpp
445/tcp open microsoft-ds
458/tcp open appleqtc
464/tcp open kpasswd5
465/tcp open smtps
481/tcp open dvs
497/tcp open retrospect
500/tcp open isakmp
512/tcp open exec
513/tcp open login
514/tcp open shell
515/tcp open printer
524/tcp open ncp
541/tcp open uucp-rlogin
543/tcp open klogin
544/tcp open kshell
545/tcp open ekshell
548/tcp open afp
554/tcp open rtsp
555/tcp open dsf
563/tcp open snews
587/tcp open submission
593/tcp open http-rpc-epmap
616/tcp open unknown
617/tcp open sco-dtmgr
625/tcp open apple-xsrvr-admin
631/tcp open ipp
636/tcp open ldapssl
646/tcp open ldp
648/tcp open unknown
666/tcp open doom
667/tcp open unknown
668/tcp open unknown
683/tcp open corba-iiop
687/tcp open unknown
691/tcp open resvc
700/tcp open unknown
705/tcp open unknown
711/tcp open unknown
714/tcp open unknown
720/tcp open unknown
722/tcp open unknown
726/tcp open unknown
749/tcp open kerberos-adm
765/tcp open webster
777/tcp open unknown
783/tcp open spamassassin
787/tcp open qsc
800/tcp open mdbs_daemon
801/tcp open device
808/tcp open ccproxy-http
843/tcp open unknown
873/tcp open rsync
880/tcp open unknown
888/tcp open accessbuilder
898/tcp open sun-manageconsole
900/tcp open unknown
901/tcp open samba-swat
902/tcp open iss-realsecure
903/tcp open iss-console-mgr
911/tcp open unknown
912/tcp open unknown
981/tcp open unknown
987/tcp open unknown
990/tcp open ftps
992/tcp open telnets
993/tcp open imaps
995/tcp open pop3s
999/tcp open garcon
1000/tcp open cadlock
1001/tcp open unknown
1002/tcp open windows-icfw
1007/tcp open unknown
1009/tcp open unknown
1010/tcp open unknown
1011/tcp open unknown
1021/tcp open unknown
1022/tcp open unknown
1023/tcp open netvenuechat
1024/tcp open kdm
1025/tcp open NFS-or-IIS
1026/tcp open LSA-or-nterm
1027/tcp open IIS
1028/tcp open unknown
1029/tcp open ms-lsa
1030/tcp open iad1
1031/tcp open iad2
1032/tcp open iad3
1033/tcp open netinfo
1034/tcp open zincite-a
1035/tcp open multidropper
1036/tcp open unknown
1037/tcp open unknown
1038/tcp open unknown
1039/tcp open unknown
1040/tcp open netsaint
1041/tcp open unknown
1042/tcp open unknown
1043/tcp open boinc
1044/tcp open unknown
1045/tcp open unknown
1046/tcp open unknown
1047/tcp open unknown
1048/tcp open unknown
1049/tcp open unknown
1050/tcp open java-or-OTGfileshare
1051/tcp open optima-vnet
1052/tcp open ddt
1053/tcp open unknown
1054/tcp open unknown
1055/tcp open ansyslmd
1056/tcp open unknown
1057/tcp open unknown
1058/tcp open nim
1059/tcp open nimreg
1060/tcp open polestar
1061/tcp open unknown
1062/tcp open veracity
1063/tcp open unknown
1064/tcp open unknown
1065/tcp open unknown
1066/tcp open fpo-fns
1067/tcp open instl_boots
1068/tcp open instl_bootc
1069/tcp open cognex-insight
1070/tcp open unknown
1071/tcp open unknown
1072/tcp open unknown
1073/tcp open unknown
1074/tcp open unknown
1075/tcp open unknown
1076/tcp open sns_credit
1077/tcp open unknown
1078/tcp open unknown
1079/tcp open unknown
1080/tcp open socks
1081/tcp open unknown
1082/tcp open unknown
1083/tcp open ansoft-lm-1
1084/tcp open ansoft-lm-2
1085/tcp open unknown
1086/tcp open unknown
1087/tcp open unknown
1088/tcp open unknown
1089/tcp open unknown
1090/tcp open unknown
1091/tcp open unknown
1092/tcp open unknown
1093/tcp open unknown
1094/tcp open unknown
1095/tcp open unknown
1096/tcp open unknown
1097/tcp open unknown
1098/tcp open unknown
1099/tcp open unknown
1100/tcp open unknown
1102/tcp open unknown
1104/tcp open unknown
1105/tcp open unknown
1106/tcp open unknown
1107/tcp open unknown
1108/tcp open unknown
1110/tcp open nfsd-status
1111/tcp open unknown
1112/tcp open msql
1113/tcp open unknown
1114/tcp open unknown
1117/tcp open unknown
1119/tcp open unknown
1121/tcp open unknown
1122/tcp open unknown
1123/tcp open unknown
1124/tcp open unknown
1126/tcp open unknown
1130/tcp open unknown
1131/tcp open unknown
1132/tcp open unknown
1137/tcp open unknown
1138/tcp open unknown
1141/tcp open unknown
1145/tcp open unknown
1147/tcp open unknown
1148/tcp open unknown
1149/tcp open unknown
1151/tcp open unknown
1152/tcp open unknown
1154/tcp open unknown
1163/tcp open unknown
1164/tcp open unknown
1165/tcp open unknown
1166/tcp open unknown
1169/tcp open unknown
1174/tcp open unknown
1175/tcp open unknown
1183/tcp open unknown
1185/tcp open unknown
1186/tcp open unknown
1187/tcp open unknown
1192/tcp open unknown
1198/tcp open unknown
1199/tcp open unknown
1201/tcp open unknown
1213/tcp open unknown
1216/tcp open unknown
1217/tcp open unknown
1218/tcp open aeroflight-ads
1233/tcp open unknown
1234/tcp open hotline
1236/tcp open unknown
1244/tcp open unknown
1247/tcp open unknown
1248/tcp open hermes
1259/tcp open unknown
1271/tcp open unknown
1272/tcp open unknown
1277/tcp open unknown
1287/tcp open unknown
1296/tcp open unknown
1300/tcp open unknown
1301/tcp open unknown
1309/tcp open unknown
1310/tcp open unknown
1311/tcp open rxmon
1322/tcp open unknown
1328/tcp open unknown
1334/tcp open unknown
1352/tcp open lotusnotes
1417/tcp open timbuktu-srv1
1433/tcp open ms-sql-s
1434/tcp open ms-sql-m
1443/tcp open ies-lm
1455/tcp open esl-lm
1461/tcp open ibm_wrless_lan
1494/tcp open citrix-ica
1500/tcp open vlsi-lm
1501/tcp open sas-3
1503/tcp open imtc-mcs
1521/tcp open oracle
1524/tcp open ingreslock
1533/tcp open virtual-places
1556/tcp open unknown
1580/tcp open unknown
1583/tcp open unknown
1594/tcp open unknown
1600/tcp open issd
1641/tcp open unknown
1658/tcp open unknown
1666/tcp open netview-aix-6
1687/tcp open unknown
1688/tcp open unknown
1700/tcp open mps-raft
1717/tcp open fj-hdnet
1718/tcp open unknown
1719/tcp open unknown
1720/tcp open H.323/Q.931
1721/tcp open unknown
1723/tcp open pptp
1755/tcp open wms
1761/tcp open landesk-rc
1782/tcp open hp-hcip
1783/tcp open unknown
1801/tcp open unknown
1805/tcp open unknown
1812/tcp open unknown
1839/tcp open unknown
1840/tcp open unknown
1862/tcp open unknown
1863/tcp open msnp
1864/tcp open paradym-31
1875/tcp open unknown
1900/tcp open upnp
1914/tcp open unknown
1935/tcp open rtmp
1947/tcp open unknown
1971/tcp open unknown
1972/tcp open unknown
1974/tcp open unknown
1984/tcp open bigbrother
1998/tcp open x25-svc-port
1999/tcp open tcp-id-port
2000/tcp open cisco-sccp
2001/tcp open dc
2002/tcp open globe
2003/tcp open finger
2004/tcp open mailbox
2005/tcp open deslogin
2006/tcp open invokator
2007/tcp open dectalk
2008/tcp open conf
2009/tcp open news
2010/tcp open search
2013/tcp open raid-am
2020/tcp open xinupageserver
2021/tcp open servexec
2022/tcp open down
2030/tcp open device2
2033/tcp open glogger
2034/tcp open scoremgr
2035/tcp open imsldoc
2038/tcp open objectmanager
2040/tcp open lam
2041/tcp open interbase
2042/tcp open isis
2043/tcp open isis-bcast
2045/tcp open cdfunc
2046/tcp open sdfunc
2047/tcp open dls
2048/tcp open dls-monitor
2049/tcp open nfs
2065/tcp open dlsrpn
2068/tcp open advocentkvm
2099/tcp open unknown
2100/tcp open unknown
2103/tcp open zephyr-clt
2105/tcp open eklogin
2106/tcp open ekshell
2107/tcp open unknown
2111/tcp open kx
2119/tcp open unknown
2121/tcp open ccproxy-ftp
2126/tcp open unknown
2135/tcp open unknown
2144/tcp open unknown
2160/tcp open unknown
2161/tcp open apc-agent
2170/tcp open unknown
2179/tcp open unknown
2190/tcp open unknown
2191/tcp open unknown
2196/tcp open unknown
2200/tcp open unknown
2222/tcp open unknown
2251/tcp open unknown
2260/tcp open unknown
2288/tcp open unknown
2301/tcp open compaqdiag
2323/tcp open unknown
2366/tcp open unknown
2381/tcp open unknown
2382/tcp open unknown
2383/tcp open ms-olap4
2393/tcp open unknown
2394/tcp open unknown
2399/tcp open unknown
2401/tcp open cvspserver
2492/tcp open unknown
2500/tcp open rtsserv
2522/tcp open unknown
2525/tcp open unknown
2557/tcp open unknown
2601/tcp open zebra
2602/tcp open ripd
2604/tcp open ospfd
2605/tcp open bgpd
2607/tcp open unknown
2608/tcp open unknown
2638/tcp open sybase
2701/tcp open sms-rcinfo
2702/tcp open sms-xfer
2710/tcp open unknown
2717/tcp open unknown
2718/tcp open unknown
2725/tcp open unknown
2800/tcp open unknown
2809/tcp open corbaloc
2811/tcp open unknown
2869/tcp open unknown
2875/tcp open unknown
2909/tcp open unknown
2910/tcp open unknown
2920/tcp open unknown
2967/tcp open symantec-av
2968/tcp open unknown
2998/tcp open iss-realsec
3000/tcp open ppp
3001/tcp open nessus
3003/tcp open unknown
3005/tcp open deslogin
3006/tcp open deslogind
3007/tcp open unknown
3011/tcp open unknown
3013/tcp open unknown
3017/tcp open unknown
3030/tcp open unknown
3031/tcp open unknown
3050/tcp open unknown
3052/tcp open powerchute
3071/tcp open unknown
3077/tcp open unknown
3128/tcp open squid-http
3168/tcp open unknown
3211/tcp open unknown
3221/tcp open unknown
3260/tcp open iscsi
3261/tcp open unknown
3268/tcp open globalcatLDAP
3269/tcp open globalcatLDAPssl
3283/tcp open netassistant
3300/tcp open unknown
3301/tcp open unknown
3306/tcp open mysql
3322/tcp open unknown
3323/tcp open unknown
3324/tcp open unknown
3325/tcp open unknown
3333/tcp open dec-notes
3351/tcp open unknown
3367/tcp open unknown
3369/tcp open unknown
3370/tcp open unknown
3371/tcp open unknown
3372/tcp open msdtc
3389/tcp open ms-term-serv
3390/tcp open unknown
// snipOffline
Not that I can be of to much help...
It won't help with the nmap issue, but it would be a good idea if he needs help with getting his rules right. The issue TheRealHoboBen is having is nmap is giving him impossible output. He ran the scan on the ip 1.2.3.4 and it's reporting it as active with all ports open.
I cannot reproduce the results TheRealHoboBen is getting.
$ nmap -PN 1.2.3.4
Starting Nmap 5.21 ( [url]http://nmap.org[/url] ) at 2010-08-01 08:05 EDT
Nmap scan report for 1.2.3.4
Host is up (0.054s latency).
All 1000 scanned ports on 1.2.3.4 are filtered
Nmap done: 1 IP address (1 host up) scanned in 20.65 secondsMy guess would be somewhere on your network the ip 1.2.3.4 has been assigned to something.
Offline