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
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 <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.
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