ftp question

[Sifalakis Manolis (WILLY)]

Tsakiris Yannis wrote:
> 
> On Fri, 12 Dec 1997, Sotiris Tsimbonis wrote:
> 
> > On Fri, 12 Dec 1997 simos at athena.teiath.gr wrote:
> > > To protokolo FTP xrisimopoiei 2 ports, ta 20(data) kai 21(control).
> > > To script me to netcat prepei na einai pio periploko :(
> >
> edw nomizw oti prepei na diafwnisw.. to eixa psaksei ligo to
> ftp protocol (eixa grapsei kai ena mikro tutorial gia arxarious
> to opoio telika den to edwsa paraeksw) kai exw grapsei kai ena
> aplo ftp client me ncurses gia linux. To port 21 einai gia na
> dexete kliseis o ftpd kai na milaei ekei me ta clients (entoles).
> otan xriastei na metabibastoun data tote i data connection
> anoigei se kapoio tyxaio port (fysika enimeronete kai to allo akro
> mesw tis control syndeseis) kai oxi sto 20. an kanw la8os perimenw
> dior8osei :)

 Sto polous servers exeis tin dynatotita na tous oriseis rita na
xrisimopoioun kapoio allo port apo to default .... Alla stin
default leitourgeia to ftpd xrisimopoiei sigoura ta ports 21(control)
kai 20(data). Pithanon na se mperdeyei to gegonos oti to connection
apo (!!) to port 20 to 3ekinaei panta (ane3artita apo tin kateythinsi 
tis pliroforias), o server ... pros ena "tyxaio" port tou client. Diladi
to prwto tcp SYN paketo gia to establishment tou connection gia ta data
to stelnei o server apo to port 20.

			Manolis. 
-- 

Sifalakis Manolis  (WILLY)
e-mail: msifa at ariadne-t.gr
   tel: +030 01 6544279   
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