Re: Connecting to different services with source port 53

From: Ron (iago_at_valhallalegends.com)
Date: 06/23/05

  • Next message: Jacob Weeks: "Re: Connecting to different services with source port 53" 
    Date: Thu, 23 Jun 2005 09:04:18 -0500
To: chris_perst@gmx.de

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    netcat has the option to change the source port:

    iago@Slayer:~$ nc -h | grep source
    ...
    connect to somewhere: nc [-options] hostname port[s] [ports] ...
    ...
            -p port local port number

    Hope that helps

    Christian Perst wrote:
    > 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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