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Trivial File Transfer Protocol Problems

By pathart11 ·
I am having difficulty with accessing tftp from a cable modem. The cable modem needs to access the tftp service in order to download it configuration to get its ranges. Now, the modem is in one ip address class lets say a subnet of The server on the other hand has an address of let say and a subnet of The tftp service can be accessed by any windows or linux system and the file can be downloaded. Hear the dilemma. Then using another tftp software on a windows interface which came with a piece of equipment i purchased it works perfect. I would like to know could it be linux tftp service or could it be router issue or should i stick to the windows software

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by pathart11 In reply to Trivial File Transfer Pro ...

I forgot to add that I am running a Fedora Core 2 system and Windows 2000 Advanced Server.

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by pathart11 In reply to Trivial File Transfer Pro ...

I have found the reason why the modem can't access the tftp but have no way to resolve it. What has happened is that the modem initials a connection to the tftp service on specific port (example 1413). Now then the tftp server returns the data instead of the destination port be port 69, the destination port is port 1413 but the modem is waiting for the data on 69. CAN Anyne help?

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by Nico Baggus In reply to Trivial File Transfer Pro ...

If you need to modify ports and addresses you
can always look into iptables. on the nat table
and appropriate chain insert the right DNAT or
SNAT translation.

OTOH, if a session is initiated like you say:
(modem,1413->server,69) the answer should be:
(server,69->modem,1413)..., have you looked if
there is different firmware for your modem.?

Have you looked at the actual packets from/to
the windows system using tcpdump/ethereal?
It should tell you when it does work as

kind regards,
Nico Baggus

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