tftp server not working

tftp server not working

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from:
   
Talking TFTP not working

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Hi,

I am trying to set up a TFTP server on my Redhat 6.2 m/c.

I have installed the server and the client packages.
I uncommented the line in /etc/inetd.conf containing the tftp settings and restarted inet.
Then,I do a "tftp ".
When I do a "get test" at the tftp prompt, nothing happens.It just exits telling that the transfer timed out.

test is a file that I have created under /tftpboot directory with 666 permission.

I think the server is not responding.



   
What server are you connecting too?


Are you trying as root, try a different user.


[user@beta user]$ tftp ftp.redhat.com
tftp> status
Connected to ftp.redhat.com.
Mode: netascii Verbose: off Tracing: off
Rexmt-interval: 5 seconds, Max-timeout: 25 seconds


are you using 127.0.0.1?

is it denied by hosts.deny / hosts.allow?
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from:
   
TFTP not working , Transfer timed out

Hi,

Please help me on making my tftp server working.

I have followed the instruction to install tftp server on centos 5.2 for our cisco router. Everything is fine, except that when i tried to put / get files its says,

"Transfer timed out."
[root@xxx tftpboot]# tftp
(to) 10.x.1.xxx
tftp> trace
Packet tracing on.
tftp> put test
sent WRQ
sent WRQ
sent WRQ
sent WRQ
sent WRQ
Transfer timed out.
[root@xxx tftpboot]#

And when i run this in cisco router, heres the output
router#copy running-config tftp
Address or name of remote host []? 10.x.0.x
Destination filename [router-confg]?
TFTP: error code 1 received - 18025

%Error opening tftp://100.x.0.x/router-confg (No such file or directory)
router#

Experts Please advice!!


   
Could you post the output from the following command:

Code:

netstat -nap | grep tftp

Another thing that would be helpful would be to post the contents of the following file:

/etc/xinet.d/tftp

Regards,

Fordeck
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TFTPD(8)                    System Manager’s Manual                   TFTPD(8)

NAME
       tftpd - IPv4 Trivial File Transfer Protocol server

SYNOPSIS
       in.tftpd [options...]  directory...

DESCRIPTION
       tftpd is a server for the Trivial File Transfer Protocol.  The TFTP protocol is extensively used to support remote boot-
       ing of diskless devices.  The server is normally started by inetd, but can also run standalone.

OPTIONS
       --ipv4, -4
              Connect with IPv4 only, even if IPv6 support was compiled in.

       --ipv6, -6
              Connect with IPv6 only, if compiled in.

       -l, --listen
              Run the server in standalone (listen) mode, rather than run from inetd.  In listen mode, the --timeout option  is
              ignored, and the --address option can be used to specify a specific local address or port to listen to.

       --foreground, -L
              Similar to --listen but do not detach from the foreground process.  Implies --listen.

       --address [address][:port], -a [address][:port]
              Specify  a  specific  address  and  port  to listen to when called with the --listen or --foreground option.  The
              default is to listen to the tftp port specified in /etc/services on all local addresses.

              Please note: Numeric IPv6 adresses must be enclosed in square brackets to avoid ambiguity with the optional  port
              information.

       --create, -c
              Allow  new files to be created.  By default, tftpd will only allow upload of files that already exist.  Files are
              created with default permissions allowing anyone to read or  write  them,  unless  the  --permissive  or  --umask
              options are specified.

       --secure, -s
              Change  root  directory on startup.  This means the remote host does not need to pass along the directory as part
              of the transfer, and may add security.  When --secure is specified, exactly one directory should be specified  on
              the  command  line.   The  use of this option is recommended for security as well as compatibility with some boot
              ROMs which cannot be easily made to include a directory name in its request.

       --user username, -u username
              Specify the username which tftpd will run as; the default is "nobody".  The user ID, group ID, and  (if  possible
              on  the platform) the supplementary group IDs will be set to the ones specified in the system permission database
              for this username.

       --umask umask, -U umask
              Sets the umask for newly created files to the specified value.  The default is zero (anyone can read or write) if
              the --permissive option is not specified, or inherited from the invoking process if --permissive is specified.

       --permissive, -p
              Perform  no additional permissions checks above the normal system-provided access controls for the user specified
              via the --user option.

       --timeout timeout, -t timeout
              When run from inetd this specifies how long, in seconds, to wait for a second connection before  terminating  the
              server.  inetd will then respawn the server when another request comes in.  The default is 900 (15 minutes.)

       --retransmit timeout, -T timeout
              Determine  the  default timeout, in microseconds, before the first packet is retransmitted.  This can be modified
              by the client if the timeout or utimeout option is negotiated.  The default is 1000000 (1 second.)

       --mapfile remap-file, -m remap-file
              Specify the use of filename remapping.  The remap-file is a file containing the remapping rules.  See the section
              on filename remapping below.  This option may not be compiled in, see the output of in.tftpd -V to verify whether
              or not it is available.

       --verbose, -v
              Increase the logging verbosity of tftpd.  This flag can be specified multiple times for even higher verbosity.

       --verbosity value
              Set the verbosity value to value.

       --refuse tftp-option, -r tftp-option
              Indicate that a specific RFC 2347 TFTP option should never be accepted.

       --blocksize max-block-size, -B max-block-size
              Specifies the maximum permitted block size.  The permitted range for this parameter is from 512 to  65464.   Some
              embedded clients request large block sizes and yet do not handle fragmented packets correctly; for these clients,
              it is recommended to set this value to the smallest MTU on your network minus 32 bytes (20 bytes for  IP,  8  for
              UDP, and 4 for TFTP; less if you use IP options on your network.)  For example, on a standard Ethernet (MTU 1500)
              a value of 1468 is reasonable.

       --port-range port:port, -R port:port
              Force the server port number (the Transaction ID) to be in the specified range of port numbers.

       --version, -V
              Print the version number and configuration to standard output, then exit gracefully.

RFC 2347 OPTION NEGOTIATION
       This version of tftpd supports RFC 2347 option negotation.  Currently implemented options are:

       blksize (RFC 2348)
              Set the transfer block size to anything less than or equal to the specified option.  This version  of  tftpd  can
              support any block size up to the theoretical maximum of 65464 bytes.

       blksize2 (nonstandard)
              Set  the  transfer  block  size to anything less than or equal to the specified option, but restrict the possible
              responses to powers of 2.  The maximum is 32768 bytes (the largest power of 2 less than or equal to 65464.)

       tsize (RFC 2349)
              Report the size of the file that is about to be transferred.  This version  of  tftpd  only  supports  the  tsize
              option for binary (octet) mode transfers.


       timeout (RFC 2349)
              Set the time before the server retransmits a packet, in seconds.

       utimeout (nonstandard)
              Set the time before the server retransmits a packet, in microseconds.

       The  --refuse option can be used to disable specific options; this may be necessary to work around bugs in specific TFTP
       client implementations.  For example, some TFTP clients have been found to request the blksize option, but crash with an
       error if they actually get the option accepted by the server.

FILENAME REMAPPING
       The  --mapfile  option  specifies a file which contains filename remapping rules.  Each non-comment line (comments begin
       with hash marks, #) contains an operation, specified below; a regex, a regular expression in the  style  of  egrep;  and
       optionally a replacement pattern.  The operation indicated by operation is performed if the regex matches all or part of
       the filename.  Rules are processed from the top down, and by default, all rules are processed even if there is a  match.

       The operation can be any combination of the following letters:

       r      Replace  the  substring  matched by regex by the replacement pattern.  The replacement pattern may contain escape
              sequences; see below.

       g      Repeat this rule until it no longer matches.  This is always used with r.

       i      Match the regex case-insensitively.  By default it is case sensitive.

       e      If this rule matches, end rule processing after executing the rule.

       s      If this rule matches, start rule processing over from the very first rule after executing this rule.

       a      If this rule matches, refuse the request and send an access denied error to the client.

       G      This rule applies to GET (RRQ) requests only.

       P      This rule applies to PUT (WRQ) requests only.

       ~      Inverse the sense of this rule, i.e. execute the operation only if the regex doesn’t match.  Cannot used together
              with r.

       The following escape sequences are recognized as part of the replacement pattern:

       \0     The entire string matched by the regex.

       \1 to \9
              The strings matched by each of the first nine parenthesized subexpressions, \( ... \), of the regex pattern.

       \i     The IP address of the requesting host, in dotted-quad notation (e.g. 192.0.2.169).

       \x     The IP address of the requesting host, in hexadecimal notation (e.g. C00002A9).

       \\     Literal backslash.


       \whitespace
              Literal whitespace.

       \#     Literal hash mark.

       \U     Turns all subsequent letters to upper case.

       \L     Turns all subsequent letters to lower case.

       \E     Cancels the effect of \U or \L.

       If the mapping file is changed, you need to send SIGHUP to any outstanding tftpd process.

SECURITY
       The  use  of TFTP services does not require an account or password on the server system.  Due to the lack of authentica-
       tion information, tftpd will allow only publicly readable files (o+r) to be accessed, unless the --permissive option  is
       specified.   Files  may  be  written only if they already exist and are publicly writable, unless the --create option is
       specified.  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.  Typically, some kind of firewall or packet-filter solution should be employed.  If appropriately
       compiled  (see the output of in.tftpd --version) tftpd will query the hosts_access(5) database for access control infor-
       mation.  This may be slow; sites requiring maximum performance may want to compile without this option and rely on fire-
       walling or kernel-based packet filters instead.

       The server should be set to run as the user with the lowest possible privilege; please see the --user flag.  It is prob-
       ably a good idea to set up a specific user account for tftpd, rather than letting it run as "nobody", to  guard  against
       privilege leaks between applications.

       Access  to  files  can, and should, be restricted by invoking tftpd with a list of directories by including pathnames as
       server program arguments on the command line.  In this case access is restricted to files whole names  are  prefixed  by
       one  of the given directories.  If possible, it is recommended that the --secure flag is used to set up a chroot() envi-
       ronment for the server to run in once a connection has been set up.

       Finally, the filename remapping (--mapfile flag) support can be used to provide a limited amount  of  additional  access
       control.

CONFORMING TO
       RFC 1123, Requirements for Internet Hosts - Application and Support.
       RFC 1350, The TFTP Protocol (revision 2).
       RFC 2347, TFTP Option Extension.
       RFC 2348, TFTP Blocksize Option.
       RFC 2349, TFTP Timeout Interval and Transfer Size Options.

AUTHOR
       This  version  of  tftpd  is  maintained  by H. Peter Anvin .  It was derived from, but has substantially
       diverged from, an OpenBSD source base, with added patches by Markus Gutschke and Gero Kulhman.

SEE ALSO
       tftp(1), egrep(1), umask(2), hosts_access(5), regex(7), inetd(8).

tftp-hpa 0.49                    30 July 2008                         TFTPD(8)
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