Как зайти на сервер по ftp с компьютера, к которому доступ есть только по ssh?

[guest@localhost ~]$ ftp ftp.gnu.org
Trying 208.118.235.20...
Connected to ftp.gnu.org (208.118.235.20).
220 GNU FTP server ready.
Name (ftp.gnu.org:guest): anonymous
230-Due to U.S. Export Regulations, all cryptographic software on this
230-site is subject to the following legal notice:
230-
230-    This site includes publicly available encryption source code
230-    which, together with object code resulting from the compiling of
230-    publicly available source code, may be exported from the United
230-    States under License Exception "TSU" pursuant to 15 C.F.R. Section
230-    740.13(e).
230-
230-This legal notice applies to cryptographic software only. Please see
230-the Bureau of Industry and Security (www.bxa.doc.gov) for more
230-information about current U.S. regulations.
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
227 Entering Passive Mode (208,118,235,20,116,140).
150 Here comes the directory listing.
lrwxrwxrwx    1 0        0               8 Aug 20  2004 CRYPTO.README -> .message
-rw-r--r--    1 0        0           17864 Oct 23  2003 MISSING-FILES
-rw-r--r--    2 0        0            4178 Aug 13  2003 MISSING-FILES.README
-rw-r--r--    1 0        0            1765 Feb 20  2007 README
-rw-r--r--    1 0        0          405121 Oct 23  2003 before-2003-08-01.md5sums.asc
-rw-r--r--    1 0        0          187338 Sep 06 10:25 find.txt.gz
drwxrwxr-x  291 0        3003        12288 Sep 06 12:20 gnu
drwxrwxr-x    3 0        3003         4096 Mar 10  2011 gnu+linux-distros
-rw-r--r--    1 0        0          360024 Sep 06 10:25 ls-lrRt.txt.gz
drwxr-xr-x    3 0        0            4096 Apr 20  2005 mirrors
lrwxrwxrwx    1 0        0              11 Apr 15  2004 non-gnu -> gnu/non-gnu
drwxr-xr-x   83 0        0            4096 Aug 17 20:14 old-gnu
lrwxrwxrwx    1 0        0               1 Aug 05  2003 pub -> .
drwxr-xr-x    2 0        0            4096 Nov 08  2007 savannah
drwxr-xr-x    2 0        0            4096 Aug 02  2003 third-party
drwxr-xr-x    2 0        0            4096 Apr 07  2009 tmp
drwxr-xr-x    2 0        0            4096 Jun 02  2011 video
-rw-r--r--    1 0        0             954 Aug 13  2003 welcome.msg
226 Directory send OK.
ftp> quit
221 Goodbye.
[guest@localhost ~]$