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 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: NAT and FTP
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 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: NAT and FTP
But this link only mentions 12.0(5)XK. I am using FTP with NAT and CET, the only complain I am having right now is the users find that small files, less than 1K, can not be transferred. No problem so far with big files. Jack ""Buri, Heather H"" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED].. . 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 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
