|TFTPD(8)||System Manager's Manual||TFTPD(8)|
Tftpdis a server which supports the DARPA Trivial File Transfer Protocol. The TFTP server operates at the port indicated in the ‘
tftp’ service description; see services(5). The server is normally started by inetd(8).
The use of tftp(1) does not require an account
or password on the remote system. Due to the lack of authentication
tftpd will allow only publicly readable
files to be accessed. Files may be written only if they already exist and
are publicly writable. Note that this extends the concept of
“public” to include all users on all hosts that can be reached
through the network; this may not be appropriate on all systems, and its
implications should be considered before enabling tftp service. The server
should have the user ID with the lowest possible privilege.
Access to files may be controlled by invoking
tftpd with a list of directories by including
pathnames as server program arguments in
/etc/inetd.conf. In this case access is restricted
to files whose names are prefixed by the one of the given directories. If no
directories are supplied the default is /tftpboot.
To give out access to the whole filesystem, should this be desired for some
reason, supply / as an argument.
Unfortunately, on multi-homed systems, it is impossible for
tftpd to determine the address on which a packet was
received. As a result,
tftpd uses two different
mechanisms to guess the best source address to use for replies. If the
socket that inetd(8) passed to
tftpd is bound to a particular address,
tftpd uses that address for replies. Otherwise,
tftpd uses ``UDP connect'' to let the kernel choose
the reply address based on the destination of the replies and the routing
tables. This means that most setups will work transparently, while in cases
where the reply address must be fixed, the virtual hosting feature of
inetd(8) can be used to ensure that replies go out from
the correct address. These considerations are important, because most tftp
clients will reject reply packets that appear to come from an unexpected
The options are:
SEE ALSO¶tftp(1), inetd(8)
tftpdcommand appeared in 4.2BSD.
|July 29, 2000||Linux NetKit (0.17)|