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TFTP OACK rejected by CBAC

Hi

I have a cisco router running ios fw.

An equipment tries to download a file by TFTP through the router. This equipement sends a TFTP read request frame to the server. The server answers with a TFTP Option Acknowledgment (opcode 6) frame which is dropped by the inspect module. Reason : illegal TFTP code.

When disabling "inspect tftp", the transfer is OK.

The TFTP OACK is an option extention of the RFC1782.

It seems that this option is not supported by cisco ios fw tftp inspect.

Can somebody confirm that ?

1 REPLY
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Re: TFTP OACK rejected by CBAC

To the best of my knowledge, the TFTP OACK is not supported by Cisco in "inspect tftp" of Cisco IOS FW image.

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