Re: tftp boot server on Redhat linux 9

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

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).

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.
>
>
>
>
>
>
>--
>Please, reply only to the list.
>
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>
>
>
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