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New Member

TFTP udp port

I have put a rule in an extended access-list permitting udp port 69 (tftp), but my tftp connections do not work. I have put both directions (any eq tftp any + any any eq tftp).

I have put a log at the end of the access-list and I have seen that the communication is in port udp 3000 once and the second time in udp port 6731. I think tftp is not working in the correct port, it seems to be a bug.

What do you think? Have you seen something similar?

TIA

2 REPLIES

Re: TFTP udp port

TFTP works like this: the client issues the first packet using udp port grater than 1023 to port 69 on the server.

The server responds using a port number grater than 1023 to the original port used by the client.

The rest of the conversation is carried out using the last to port numbers.

New Member

Re: TFTP udp port

Hello,

is there any possibility to catch the TFTP traffic?

For example with some range of the ports for server side.

Thanks

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