Can't access TFTP on a server

Hello,

There is a computer connected to a network.
There are a few processes running on the computer:
- telnet,
- my own application which listen on such port (UDP),
- TFTPd.

I can connect to the computer from home via internet to:
- telnet,
- my own application.

I can't receive/send any file from/to TFTPd. TFTPd works fine
in local network. But when I connect the computer to WAN,
TFTPd doesn't work (telnet and my own application work).

# ifconfig
eth0 Link encap:Ethernet HWaddr 00:22:A2:00:00:01
inet addr:192.168.0.190 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3202 errors:0 dropped:0 overruns:0 frame:0
TX packets:1516 errors:0 dropped:0 overruns:0 carrier:0
collisions:1 txqueuelen:100
RX bytes:300354 (293.3 Kb) TX bytes:171188 (167.1 Kb)
Interrupt:3 Base address:0x300

# /sbin/route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0


What is wrong?

Thanks in advance,
Vicky.

Problem solved: ShuttleTFTP can't access servers
not in local network. Linux's and BSD's TFTP clients
work very well.

Vicky.

> Problem solved:

Not at all. Help still wanted.

Vicky.

In article <ckj1vk$d27$(E-Mail Removed)>, Vicky wrote:

>I can connect to the computer from home via internet to:
> - telnet,
> - my own application.
>
>I can't receive/send any file from/to TFTPd. TFTPd works fine
>in local network. But when I connect the computer to WAN,
>TFTPd doesn't work (telnet and my own application work).

On the server, run tcpdump while attempting to connect from home.
Most administrators with any sense of security do not allow tftp
through a firewall - as it has been so widely exploited for data
theft. However if your admin is stupid enough to allow telnet from
outside, anything might be permitted. You could also use something
like tcptraceroute (http://michael.toren.net/code/tcptraceroute/)
to investigate where the packets are going astray.

Old guy

"Vicky" <(E-Mail Removed)> wrote
news:ckj1vk$d27$(E-Mail Removed):
> I can't receive/send any file from/to TFTPd. TFTPd works fine
> in local network. But when I connect the computer to WAN,
> TFTPd doesn't work (telnet and my own application work).

Do you have a router between your server and your internet connexion ? (it
seems yes with your prvate ip).

Is there any iptables or firewall rules (filter/forwarding) ? (iptables -L)

What is your tftp client ?


Regards