Ftp Proxy Process - F-SECURE INTERNET GATEKEEPER FOR LINUX 4.01 Administrator's Manual

11.5 FTP Proxy Process

The FTP service relays both the control session and data session. This section describes how
common protocols are processed with the FTP proxy.
Proxy mode, Passive FTP
Client
TCP connect(to: 0.0.0.1:9021)
----------------------------->
220 fsigk at fsigk
<-----------------------------
USER user@ftpserver
----------------------------->
331 Password required
<-----------------------------
PASS password
----------------------------->
230 User logged in.
<-----------------------------
PASV
----------------------------->
227 Entering Passive Mode (0,0,0,1,0,1)
<-----------------------------
RETR /file
----------------------------->
TCP connect(To: 0.0.0.1:1)
=====================>
150 Opening data connection.
<-----------------------------
File information
<======================
TCP close.
<=====================
226 Transfer complete.
<-----------------------------
QUIT
----------------------------->
F-Secure Internet Gatekeeper for Linux/Administrator's Guide
Internet Gatekeeper (fsigk, 0.0.0.1)
TCP connect(to: 0.0.0.2:21)
----------------------------->
<-----------------------------
----------------------------->
<-----------------------------
----------------------------->
<-----------------------------
----------------------------->
<-----------------------------
----------------------------->
TCP connect(To: 0.0.0.2:2)
=====================>
<-----------------------------
<=====================
(Virus scan)
<=====================
<-----------------------------
----------------------------->
FTP server (ftpserver, 0.0.0.2)
220 ftpserver
USER user
331 Password required
PASS password
230 User logged in.
PASV
227 Entering Passive Mode (0,0,0,2,0,2)
RETR /file
150 Opening data connection.
File information
TCP close
226 Transfer complete.
QUIT
221 Goodbye.
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