Re: udp port 69 (tftp) unreachable

On Wed, 7 May 2003, Michael Anburaj wrote:

> Hi,
> 
> When I do tftp from my TFTP client (Target board running YAMON) it fails. 
> The TFTP server is configured on a stand-alone PC running RH Linux 9.
> 
> 
> Info. about the protocols on the Host PC:
> ---------------------------------
> 
> [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
> 
> 
> 
> Captured using $ tcpdump -n (while tftp client was actively trying)
> -----------------------
> 20:56:40.615815 arp who-has 4.42.102.5 tell 4.42.102.6
> 20:56:40.615890 arp reply 4.42.102.5 is-at 0:e0:98:9e:84:96
> 20:56:40.622048 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" (DF)
> 20:56:40.622112 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp 
> unreachable [tos 0xc0]
> 20:56:41.699926 4.42.102.6.1040 > 4.42.102.5.tftp: 20 RRQ "vmlinux.rec" (DF)
> 20:56:41.700006 4.42.102.5 > 4.42.102.6: icmp: 4.42.102.5 udp port tftp 
> unreachable [tos 0xc0]
> 
> Please tell me why the PC host running tftp server is replying udp port tftp 
> unreachable?
> 
> Could this be firewall issue? The RH linux 9 installation is new & its at 
> home.

I already said it could be.
service firewall stop
Or
iptables -F
Or, if you're using the old-fashioned ipchains
ipchains -F


> 
> Both hosts.allow and hosts.deny files under /etc
> are empty.

Good. I didn't think of that one.


> 
> Please tell me what other issue this might be or a procedure to debug this 
> further.

I'm running out of ideas, and I don't (and won't) run RHL 8.0 or later.



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