2011-09-27

TFTP over firewall (using tftpd32)

For the first time I have had the need to use tftp over a firewall.

I knew that port 69 was involved on the server side but what I did not know was that the data transfer is done over a new connection from client to server on a dynamic port!

But luckily with tftpd32 I was able to specify the local port pool and I have set it to 69:69. This worked like a charm.

some info:
http://netlab18.cis.nctu.edu.tw/html/InternetProtocol/2005/pdf/Chap-19.pdf
http://www.certificationzone.com/cisco/newsletter/SL/nla_11-30-04_basic.html

have charts for active/passive ftp

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