Date: Tue, 11 Feb 2003 08:18:31 -0600 From: Redmond Militante <r-militante@northwestern.edu> To: Fernando Gleiser <fgleiser@cactus.fi.uba.ar> Cc: freebsd-security@freebsd.org Subject: Re: n00b ipf/ipnat questions Message-ID: <20030211141831.GB824@darkpossum> In-Reply-To: <20030211090154.R30313-100000@cactus.fi.uba.ar> References: <20030211002256.GA824@darkpossum> <20030211090154.R30313-100000@cactus.fi.uba.ar>
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hi
thanks for responding
i made a few changes last night to my config, but i still see open ports when i run nmap , despite my ipf.rules. if you like, i can post my updated config, although it's not that different...
tcp ports seem to be open. i'm using: nmap -sS -v -O my.hostname.org
here's the results of an nmap run
Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Host my.hostname.org (129.x.x.x) appears to be up ... good.
Initiating SYN Stealth Scan against my.hostname.org (129.x.x.x)
Adding open port 32774/tcp
Adding open port 15/tcp
Adding open port 31337/tcp
Adding open port 1524/tcp
Adding open port 111/tcp
Adding open port 1/tcp
Adding open port 32771/tcp
Adding open port 79/tcp
Adding open port 54320/tcp
Adding open port 22/tcp
Adding open port 540/tcp
Adding open port 587/tcp
Adding open port 12346/tcp
Adding open port 1080/tcp
Adding open port 25/tcp
Adding open port 119/tcp
Adding open port 11/tcp
Adding open port 27665/tcp
Adding open port 6667/tcp
Adding open port 80/tcp
Adding open port 635/tcp
Adding open port 21/tcp
Adding open port 32773/tcp
Adding open port 143/tcp
Adding open port 32772/tcp
Adding open port 12345/tcp
Adding open port 2000/tcp
The SYN Stealth Scan took 157 seconds to scan 1601 ports.
Warning: OS detection will be MUCH less reliable because we did not find at least 1 open and 1 closed TCP port
For OSScan assuming that port 1 is open and port 35689 is closed and neither are firewalled
For OSScan assuming that port 1 is open and port 44468 is closed and neither are firewalled
For OSScan assuming that port 1 is open and port 31999 is closed and neither are firewalled
Interesting ports on herald.medill.northwestern.edu (129.105.51.6):
(The 1574 ports scanned but not shown below are in state: filtered)
Port State Service
1/tcp open tcpmux
11/tcp open systat
15/tcp open netstat
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
79/tcp open finger
80/tcp open http
111/tcp open sunrpc
119/tcp open nntp
143/tcp open imap2
540/tcp open uucp
587/tcp open submission
635/tcp open unknown
1080/tcp open socks
1524/tcp open ingreslock
2000/tcp open callbook
6667/tcp open irc
12345/tcp open NetBus
12346/tcp open NetBus
27665/tcp open Trinoo_Master
31337/tcp open Elite
32771/tcp open sometimes-rpc5
32772/tcp open sometimes-rpc7
32773/tcp open sometimes-rpc9
32774/tcp open sometimes-rpc11
54320/tcp open bo2k
No exact OS matches for host (test conditions non-ideal).
TCP/IP fingerprint:
SInfo(V=3.00%P=i386-portbld-freebsd4.7%D=2/11%Time=3E490979%O=1%C=-1)
TSeq(Class=TR%IPID=I%TS=100HZ)
T1(Resp=Y%DF=Y%W=E000%ACK=S++%Flags=AS%Ops=MNWNNT)
T2(Resp=N)
T3(Resp=Y%DF=Y%W=E000%ACK=S++%Flags=AS%Ops=MNWNNT)
T4(Resp=Y%DF=N%W=0%ACK=O%Flags=R%Ops=)
T5(Resp=N)
T6(Resp=N)
T7(Resp=N)
PU(Resp=N)
Uptime 0.007 days (since Tue Feb 11 08:21:40 2003)
TCP Sequence Prediction: Class=truly random
Difficulty=9999999 (Good luck!)
IPID Sequence Generation: Incremental
Nmap run completed -- 1 IP address (1 host up) scanned in 179 seconds
any advice you could give would be appreciated.
thanks
redmond
> >
> > i've managed to get it nat'ing one machine so far, the webserver. the public
> > ip of the webserver is aliased to the external nic on the gateway machine.
> > httpd and ftp work ok behind the gateway box. i have many questions,
> > however. the first being why - despite the firewall rules i have in place
> > on the gateway, when i nmap the public ip of the webserver it shows me all
> > sorts of ports being open. i can't make out from my gateway configuration
> > where this is happening.
>
> What ports? is it TCP or UDP? UDP scanning is very prone to false positives.
> It would help if you post the nmap flags line you're using and the results,
> obsfuscate the IP if you don't want us to know it.
>
> Another posibility is some interception/transparent proxy on your ISP.
>
>
> Fer
>
> >
> > any advice would be appreciated
> >
> > thanks
> > redmond
> >
>
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