On Wed, 7 May 2003, Michael Anburaj wrote:
> Hi John,
>
> Info. about the protocols:
> [root@xxxxxxxxx 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 <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://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@xxxxxx 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@xxxxxx 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@xxxxxx:~$
> >
> >tcpdump which is excellent for snooping traffic on your LAN.
> >
> >
> >
> >
> >
> >
> >--
> >Please, reply only to the list.
> >
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> >
> >
> >
> >
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