RE: [cobalt-users] Anyone know where to get nmap for RAQ2 -

["Peter Masloch" <peter@xxxxxxxxxxx>]

That is correct. But port 20 is not an "always open"
port like 21, 23 or 80. Port 20 just open after the
connection to port 21 is established.
Peter


>Actually, active (i.e. traditional) FTP uses port 21 for 
>control and commands and port 20 for data transfer.  Passive 
>FTP  uses port 21 for control and commands and a random port 
>(where port# > 1024) for data transfer.  
>
>If you are supporting regular FTP you need to have both ports 
>20 & 21 open. If not, users will be able to connect and issue 
>commands, such as directory listings or file upload/download 
>initiation, but no data will actually be transferred (i.e. no 
>results from the commands and no files transferred).
>
>Abe
>
>"If you think technology can solve your security problems,
>then you don't understand the problems and you don't
>understand the technology." 
>-Bruce Schneier, Secrets and Lies
>
>
>
>-----Original Message-----
>From: Peter Masloch [mailto:peter@xxxxxxxxxxx]
>Sent: Friday, June 07, 2002 1:36 PM
>To: cobalt-users@xxxxxxxxxxxxxxx
>Subject: RE: [cobalt-users] Anyone know where to get nmap for RAQ2 -
>
>
>21 = FTP (there is only one)
>22 = SSH
>23 = Telnet 
>
>>I believe one is for client one is for server (21 server, 22
>>client).  and 23 is telnet.
>>
>>-----Original Message-----
>>From: Paul Alcock [mailto:webmgr@xxxxxxxxxxxxxxxxxx]
>>Sent: Friday, June 07, 2002 11:17 AM
>>To: cobalt-users@xxxxxxxxxxxxxxx
>>Subject: RE: [cobalt-users] Anyone know where to get nmap for RAQ2 -
>>
>>
>>> On Friday 07 June 2002 11:48 am, Paul Alcock wrote:
>>> 
>>> > Thanks all, got nmap installed on my 2nd RAQ2.
>>> > The compile and install routine worked fine, a few errors
>>that mean
>>> > it won't run in a gui (it notes that guis are for wimps!)
>>> >
>>> > Did a scan and here's the meat of the response, see
>>anything wrong?
>>> > (used nmap -v -sS -O mymachineipaddress)
>>> >
>>> > Adding open port 81/tcp	ADM
>>> > Adding open port 21/tcp	FTP
>>> > Adding open port 53/tcp	NAMED
>>> > Adding open port 443/tcp	SSL HTTP	
>>> > Adding open port 444/tcp	SSL ADM
>>> > Adding open port 143/tcp	IMAP
>>> > Adding open port 25/tcp	SMTP
>>> > Adding open port 80/tcp	HTTP
>>> > Adding open port 110/tcp	POP3
>>> > Adding open port 22/tcp	FTP
>>> >
>>> > Should any of thost ports be closed?
>>> >
>>> 
>>> For maximum security, close them all ;-))
>>> looks good, as long as you are using those services.
>>> 
>>> --
>>> Gerald Waugh
>>Thanks Gerald, ok, I'll close them all (LOL)
>>But seriously, is there a reason for both 21 and 22 for ftp?
>>
>>Paul.
>>
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>
>
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