Newsgroup: it.comp.os.linux.sys
Titolo: Problema ftp

Non sono un sysadmin ma posto qui perchè immagino che siate i migliori. :D
Volevo tirare su un serverino ftp per condividere qualche file con gli amici
e così ho installato vsftpd.
Il problema è che in locale riesco a loggarmi ma quando qualcuno prova da
fuori gli compare la schermata di login del mio router (un Atlantis) e,
ovviamente, tentando un accesso anonimo (user:anonymous
pass:pinco...@isp.it
) viene lasciato fuori.
In linux non ho il firewall, le porte sul router sono aperte, ma facendo una
scansione della 20 e della 21 in questo sito 
www.grc.com
 risultano stealth.
Il server viene avviato via init.d (/etc/init.d/vsftpd start) e questo è il
mio vsftpd.conf:
# Example config file /etc/vsftpd/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this
out).
anonymous_enable=YES
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=NO
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you
will
# obviously need to create a directory writable by the FTP user.
anon_upload_enable=NO
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# Activate logging of uploads/downloads.
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever
#
# You may override where the log file goes if you like. The default is shown
# below.
#xferlog_file=/var/log/vsftpd.log
#
# If you want, you can have your log file in standard ftpd xferlog format
xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do
ASCII
# mangling on files when in ASCII mode.
# Beware that turning on ascii_download_enable enables malicious remote
parties
# to consume your I/O resources, by issuing the command "SIZE /big/file" in
# ASCII mode.
# These ASCII options are split into upload and download because you may
wish
# to enable ASCII uploads (to prevent uploaded scripts etc. from breaking),
# without the DoS risk of SIZE and ASCII downloads. ASCII mangling should be
# on the client anyway..
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
ftpd_banner=Welcome to Cyberninja FTP service.
#
# You may specify a file of disallowed anonymous e-mail addresses.
Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd/banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
#chroot_list_enable=YES
# (default follows)
#chroot_list_file=/etc/vsftpd/chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror"
assume
# the presence of the "-R" option, so there is a strong case for enabling
it.
ls_recurse_enable=YES
pam_service_name=vsftpd
userlist_enable=YES
#enable for standalone mode
listen=YES
tcp_wrappers=YES
Please, help me!
Luca

 fuori gli compare la schermata di login del mio router (un Atlantis) e,
non ho letto il resto, ma mi son fermato qui.
Hai detto al tuo atlantis land di fare nat ?
-- 
Diego
L'Italiano medio ha un testicolo, una tetta e meno di due gambe! 

 fuori gli compare la schermata di login del mio router (un Atlantis) e,
Essendo il router quello che effettua la connessione, è lui che si prende
dal tuo provider l'indirizzo IP pubblico. Quindi è corretto che i tuoi
amici connettendosi a quell'indirizzo vedano il router. 
Solitamente nelle configurazioni dei router c'è la possibilità di
impostare il NAT o il PORT FARWARDING.
Il primo rende tutta la macchina come pubblica su internet, mentre il
secondo ti permette di impostare delle porte a cui risponderà la tua
macchina.
Quindi se l'unico servizio che ti serve rendere pubblico è l'ftp, fai un
port farwarding sulla porta 21. 
Ciao
p.s. il tuo problema non riguarda nè Linux nè l'ftp. E un problema di
rete e router.


;)
Però forse sono io che non capisco che vuoi dire...
Nella scheda NAT ho impostato le porte 20 e 21 per essere reindirizzate
all'ip che mi assegna il DHCP.