Hi George,
I came across the following information regarding FTP and NAT from the Cisco
website. It sounds like this could be what was going on:
CSCdk03906
When running NAT and encryption, FTP fails, but Telnet and ping work. The
TCP checksum is not calculated correctly. Removing NAT or encryption
resolves the problem.
For performance reasons, decryption is not done until the packets are
switched to the output interface. This caused the problem with IOS NAT,
because NAT may need to do the payload translation for certain protocols.
The affected protocols include FTP and NetBios, for example.
Here is the complete URL for the article:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/relnote/3600
ser/rn3600xk.htm
Heather Buri
-----Original Message-----
From: George Kadeishvili [mailto:[EMAIL PROTECTED]]
Sent: Thursday, February 08, 2001 8:00 AM
To: [EMAIL PROTECTED]
Subject: NAT and FTP
Hi all!
We came across a strange problem. We'we been doing NAT from ethernet to
serial,
all the things seem to be working, except FTP. Problem got resolved
after turning off tcp header compression on serial. I couldn't find any
notion of it on CCO. Is it a bug, or I'm missing somethings obvious?
Regards
George
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