Re: tftp boot server on Redhat linux 9

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


Hi John,

Info. about the protocols:
[root@xxxxxxxxx root]# lsof -c x -a -i
xinetd 1757 root 5u IPv4 2205 TCP localhost.localdomain:1025 (LISTEN)
xinetd 1757 root 6u IPv4 2208 UDP *:tftp

Please help me figure out these:

1. please mention the log file that I need to look at, if its esay for you.
2. I am new to linux & tcpdump, please let me know a method (parameter) for running tcpdump, so that I will be able to view clearly the packets sent & received with some description of the packet type (just like it's with ethreal).


From: John <red@xxxxxxxxxxxxxxxxxxxxxxx>
Reply-To: redhat-devel-list@xxxxxxxxxx
To: redhat-devel-list@xxxxxxxxxx
Subject: Re: tftp boot server on Redhat linux 9
Date: Wed, 7 May 2003 13:31:24 +0800 (WST)

On Wed, 7 May 2003, Michael Anburaj wrote:

> Hi All,
> Thanks a lot for you segestions.
> I edited the configuration file '/etc/xinetd.d/tftp'
> & now it has:
> service tftp
> {
> socket_type = dgram
> protocol = udp
> wait = yes
> user = root
> server = /usr/sbin/in.tftpd
> server_args = -u nobody -s /tftpboot
> disable = no
> per_source = 11
> cps = 100 2
> flags = IPv4
> }
> after that I issued the following command to restart the tftp server:
> $ /etc/rc.d/init.d/xinetd restart
> Then from my tftp client (target board running YAMON) issued the command to
> get a file using tftp:
> YAMON> load tftp://
> About to load tftp://
> Press Ctrl-C to break
> Error : TFTP READ-REQ timeout ERROR
> Hint : Check TFTP-server is up and running
> where:
> vmlinux.rec is in /tftpboot on the PC host
> is the IP of my host PC running Redhat Linux 9
> is the IP of Target board running YAMON (TFTP client)
> Connection:
> Target running YAMON <--> hub port - Ethernet HUB - hub port <--> PC running
> RH Linux 9
> These are the only 2 machines physically connected in the network.
> Ping works from either side.
> Questions:
> 1. Is the network set-up OK for tftp (its a peer-to-peer connection)?
> 2. The TFTP status using 'redhat-config-services' shows xinetd. Is this too
> advanced for the YAMON - Compatibility issue?
> 3. Do I need to reboot RH Linux for the configuration to take effect?
> 4. Do you find anything missing or wrong.

Looks okay from here. Your diagnostic tools are
Log files in /var/logs. The tftp server mentions little problems like
files not found. So to does xinetd complain if it finds a problem
lsof (or netstat) to tell you whether something's listening:
[root@xxxxxx root]# lsof -c x -a -i
xinetd  913 root    5u  IPv4   1759       TCP *:pop3 (LISTEN)
xinetd  913 root    6u  IPv4   1760       TCP *:rsync (LISTEN)
xinetd  913 root    7u  IPv4   1761       UDP *:tftp
xinetd  913 root    9u  IPv4   1762       TCP *:time (LISTEN)
[root@xxxxxx root]#

The tftp client which _may_ have more intelligence than your board:
# does not exist here:
Numbat:~# tftp
tftp> get fred
Transfer timed out.

tftp> quit
# exists, but there's no tftp server there
Numbat:~# tftp
tftp> get fred
Transfer timed out.
# Magpie is my working server
tftp> Numbat:~# tftp magpie
tftp> get fred
Error code 1: File not found
tftp> Numbat:~# logout
Connection to Numbat closed.

tcpdump which is excellent for snooping traffic on your LAN.

-- Please, reply only to the list.

Join the "Linux Support by Small Businesses" list at

_______________________________________________ Redhat-devel-list mailing list Redhat-devel-list@xxxxxxxxxx

MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.

Redhat-devel-list mailing list

[Index of Archives]     [Kernel Newbies]     [Red Hat General]     [Fedora]     [Red Hat Install]     [Linux Kernel Development]     [Yosemite News]

  Powered by Linux