Connecting to different services with source port 53

From: Christian Perst (chris_perst@gmx.de)
Date: Thu Jun 23 2005 - 03:38:13 EDT

Hi list,

I'm pen-testing a system and with a normal "nmap -sS" I get no
response. If I change the source port I could get through to
the system, as you can see.

21/tcp open ftp
80/tcp open http
88/tcp open kerberos-sec
135/tcp open msrpc
389/tcp open ldap
443/tcp open https
464/tcp open kpasswd5
593/tcp open http-rpc-epmap
636/tcp open ldapssl
1026/tcp open LSA-or-nterm
1029/tcp open ms-lsa
1033/tcp open netinfo
1720/tcp open H.323/Q.931
1723/tcp open pptp
3268/tcp open globalcatLDAP
3269/tcp open globalcatLDAPssl
3372/tcp open msdtc
3389/tcp open ms-term-serv
6101/tcp open VeritasBackupExec
6106/tcp open isdninfo
8080/tcp filtered http-proxy
10000/tcp open snet-sensor-mgmt

Is there a way, how I can establish a connection using source
port 53?

Thanks,
Chris

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