Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: TFTP can not send/receive files!!

TFTP can not send/receive files!! 8 years 5 days ago #27798

I am using Fedora 8 and installed all TFTP packages on 2 computers connected by ethernet LAN adaptor.

When i use "put" command at TFTP prompt, the computer sends TFTP write request to the second machine and it replies with:
ICMP, desination unreachable(port unreachable)

I have disabled firewalls and SELinux on both computers but still can not get rid of this error. "nmap" on the second computer doesn't show any port 69, open though i have enabled port 69 udp/tcp by the graphical icon of Fedora 8.

Though this problem doesn't relate to the firewall and packet filtering because i have disabled firewall!!

What is the answer ? how can i use TFTP?

My email is:
This email address is being protected from spambots. You need JavaScript enabled to view it.
The administrator has disabled public write access.

Re: TFTP can not send/receive files!! 8 years 5 days ago #27799

  • S0lo
  • S0lo's Avatar
  • Offline
  • Moderator
  • Posts: 1577
  • Thank you received: 7
  • Karma: 3
Can you ping between the two machines? If not then what is the result? "Destination Unreachable" or "Time Out" or .... ?
Studying CCNP...

Ammar Muqaddas
Forum Moderator
The administrator has disabled public write access.

Re: TFTP can not send/receive files!! 8 years 5 days ago #27803

  • novembre
  • novembre's Avatar
  • Offline
  • Frequent Member
  • Posts: 58
  • Karma: 0
try netstat -l on your server machine to make sure you have actually opened the port correctly and the service is running.
The administrator has disabled public write access.

Re: TFTP can not send/receive files!! 7 years 7 months ago #29598

  • zaken
  • zaken's Avatar
  • Offline
  • New Member
  • Posts: 1
  • Karma: 0
# lsof -i - n
as root also will show you the ports open.

Although I would do
ps -eaf | grep ftp
or ps -aux | grep ftp
One of these will show you the command that is run to start the tftpd server.

This is mine:
tftpserver etc # ps -eaf | grep tftp
root 11901 1 0 Feb20 ? 00:00:00 /usr/sbin/in.tftpd -l -R 4096:32767 -s /var/tftp/
root 17635 17612 0 19:10 pts/12 00:00:00 grep --colour=auto tftp
tftpserver etc #

Read the tftpd man page for what the options mean.
# man tftpd

On mine I needed to do this to manually start the tftp server if it hadnt started. I dont trust the GUI's.
# /etc/init.d/in.tftpd start

You can test the route with telnet or ssh, I mean if they can connect to the router from the tftpd server the routings ok.
# netstat -rn shows you the linux routing table.

I found that to get the tftp working, I had to have the server configured properly on linux. try looking for /etc/conf.d/in.tftpd

These might help find a configuration file on linux.
# updatedb
# locate tftpd

Mine was going to send files to /var/tftp/
and within that directory I must have the filename existing before the, in my case, Pix firewall can write its config there. This is the same principal for a router or switch. File must be writeable.
# chmod 0666 filename.txt

On the PIX i needed a tftp-server line
tftp-server inside <tftpd-server-ip> pix-config.txt
the "inside" being the interface the server will be out of relative to the PIX.

From above /var/tftp/pix-config.txt file must exist for this to work.

I need to go through mine but permissions and security needs to be looked at as I think /var/tftp is open for anyone to write to.
Luckily mines behind quite a few firewalls!

Ive got scripts that get the configs via nightly cron job of all the PIX I manage and keeps them on a webpage for other firewall engineers. Engineers can also manually do a write net on teh PIX or routers to do the same before or after changes.

Its very worth while checking this out too. Google for it!
ciscocmd-1.5, its a script that allows you to run any commands remotely to a raft of cisco devices. Whats relevant here is the write net command and having the tftpd set up properly.

Hope that helps,
The administrator has disabled public write access.
Time to create page: 0.083 seconds


Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V


  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup