TFTP issue

General Help
1

I’m having a strange issue. Fresh install of FreePBX.

  • tftp is running…

[root@pbx ~]# ps aux | grep tftp
root 1978 0.0 0.1 2488 696 ? Ss 09:44 0:00 in.tftpd -s /tftpboot --verbose

  • iptables turned off

  • I can connect locally but not pull file…
    [root@pbx ~]# tftp localhost
    tftp> status
    Connected to localhost.
    Mode: netascii Verbose: off Tracing: off Literal: off
    Rexmt-interval: 5 seconds, Max-timeout: 25 seconds
    tftp> get test
    Transfer timed out.

  • I can connect locally with Static IP of server…
    [root@pbx ~]# tftp (static public IP)
    tftp> status
    Connected to (Static IP).
    Mode: netascii Verbose: off Tracing: off Literal: off
    Rexmt-interval: 5 seconds, Max-timeout: 25 seconds
    tftp> get test
    tftp>

  • When I connect locally with IP, I get a message in /var/log/messages. Any other time, I don’t.

May 8 10:01:04 pbx in.tftpd[2161]: RRQ from (IP address) filename test

  • If I try to connect to TFTP from home here is what I get. Also nothings shows up in /var/log/messages…
    user@desktop:~$ tftp (static IP)
    tftp> status
    Connected to (static IP).
    Mode: netascii Verbose: off Tracing: off
    Rexmt-interval: 5 seconds, Max-timeout: 25 seconds
    tftp> get test
    Transfer timed out.

I have eliminated all firewalls. No luck. I’m not convince its a firewall issue.

Another odd thing is yesterday, on another test PBX, I had the same issue as above except in my /var/log/messages, it was actually showing that it was grabbing the file but it wasn’t, it time’d out.

Any help would be great.

2

Try running ‘tcpdump port 69’

See what you see on the server during the request.

3

By dump is below. Client still says “timeout” even though you see it access the file. Also, this is weird. Fresh install, I rebooted the same box, tftpd didnt start. Even if I did a “service xinetd restart”, didnt come up. I tried starting it manually, it started then instantly died. In the Advanced Settings for the TFTP Server in FreePBX gui, I checked the box that said “Disable TFTP checking”. I did that, of course Apache locked up. I restarted Apache, I look at the tftp service to see if it started running, and it was running. Not sure what Apache and TFTP service have in common.

Dump…

[root@turnup ~]# tcpdump -v port 69
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
11:13:27.696481 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto UDP (17), length 44)
(client IP).43590 > (serverIP).tftp: 16 RRQ “test” netascii
11:13:32.696633 IP (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto UDP (17), length 44)

It just does that same message over and over again. But the client times out.

4

Okay so my findings thus far. Think the TFTP service was fine, it wasnt running cause it wasnt touched. I turned up a CentOS box bare minimum with TFTP running, I’m having the same issue. I believe its a NAT issue or routing. Because it will make it there but not back.

Thanks for the help!

5

try iptables -L