Re: tftp boot server on Redhat linux 9

On Wed, 7 May 2003, Michael Anburaj wrote:

> Hi John,
> 
> Info. about the protocols:
> [root@localhost root]# lsof -c x -a -i
> COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
> xinetd  1757 root    5u  IPv4   2205       TCP localhost.localdomain:1025 
> (LISTEN)
> xinetd  1757 root    6u  IPv4   2208       UDP *:tftp

This line is good. It shows you have something listening.

> 
> Please help me figure out these:
> 
> 1.  please mention the log file that I need to look at, if its esay for you.

The usual way I figure out which file's changed most recently is to use
the ls command. In this case you need to be root.
ls -tor /var/log

> 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).
man tcpdump

I find it helpful to write the output to an intermediate file, then try
various options to produce a report I like.
> 
> Thanks,
> -Mike.
> 
> 
> >From: John <[email protected]>
> >Reply-To: [email protected]
> >To: [email protected]
> >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://4.42.102.5/vmlinux.rec
> > > About to load tftp://4.42.102.5/vmlinux.rec
> > > 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
> > > 4.42.102.5 is the IP of my host PC running Redhat Linux 9
> > > 4.42.102.6 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@magpie root]# lsof -c x -a -i
> >COMMAND PID USER   FD   TYPE DEVICE SIZE NODE NAME
> >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@magpie root]#
> >
> >The tftp client which _may_ have more intelligence than your board:
> ># 192.168.0.99 does not exist here:
> >Numbat:~# tftp 192.168.0.99
> >tftp> get fred
> >Transfer timed out.
> >
> >tftp> quit
> ># 192.168.1.1 exists, but there's no tftp server there
> >Numbat:~# tftp 192.168.1.1
> >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.
> >summer@Numbat:~$
> >
> >tcpdump which is excellent for snooping traffic on your LAN.
> >
> >
> >
> >
> >
> >
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> >
> >
> >
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