Hi, I have just found a GUI version of nmap on my system so decided to use it against my self to see what happened.

Im not really into port scanning as ive never needed to do it and it doesnt really intrest me.
Im more of a PC repair + maintainance person.

The results I got are as follows:

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Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2004-06-30 23:08 BST
Host localhost (127.0.0.1) appears to be up ... good.
Initiating Connect() Scan against localhost (127.0.0.1) at 23:08
Adding open port 111/tcp
Adding open port 631/tcp
Adding open port 25/tcp
Adding open port 6000/tcp
The Connect() Scan took 2 seconds to scan 65535 ports.
Initiating service scan against 4 services on 1 host at 23:08
The service scan took 5 seconds to scan 4 services on 1 host.
Initiating RPCGrind Scan against localhost (127.0.0.1) at 23:08
The RPCGrind Scan took 0 seconds to scan 1 ports.
For OSScan assuming that port 25 is open and port 1 is closed and neither are firewalled
Interesting ports on localhost (127.0.0.1):
(The 65531 ports scanned but not shown below are in state: closed)
PORT STATE SERVICE OWNER VERSION
25/tcp open smtp Postfix smtpd
111/tcp open rpcbind (rpcbind V2) 2 (rpc #100000)
631/tcp open ipp CUPS 1.1
6000/tcp open X11 (access denied)
Device type: general purpose
Running: Linux 2.4.X
OS details: Linux Kernel 2.4.19 - 2.4.20
OS Fingerprint:
TSeq(Class=RI%gcd=1%SI=354465%IPID=I%TS=100HZ)
T1(Resp=Y%DF=Y%W=7FFF%ACK=S++%Flags=AS%Ops=MNNTNW)
T2(Resp=N)
T3(Resp=N)
T4(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=)
T5(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=)
T6(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=)
T7(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=)
PU(Resp=Y%DF=N%TOS=C0%IPLEN=164%RIPTL=148%RID=E%RIPCK=E%UCK=E%ULEN=134%DAT=E)

Uptime 0.132 days (since Wed Jun 30 19:58:56 2004)
TCP Sequence Prediction: Class=random positive increments
Difficulty=3490917 (Good luck!)
TCP ISN Seq. Numbers: 1B774AAC 1C310F39 1BD8958B 1BB18517 1C0D704A 1C36438F
IPID Sequence Generation: Incremental

Nmap run completed -- 1 IP address (1 host up) scanned in 12.283 seconds
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I understand the open ports and the services running on them an stuff but I am totally confused by the T1 -T7 lines aswell as the TCP ISN Seq. Numbers: 1B774......etc.???????

Could someone be kind enough to maybe interperate what all this means and if there is a sercurity implication to this?!?

Thank you very much in advance to anyone who can help me!!

edit// I forgot to say; this is the string I used: nmap -sT -sR -sV -I -O -PI -PP -PM -vv 127.0.0.1