Message 311447 - Python tracker

Message311447

Author	studioes
Recipients	giampaolo.rodola, matrixise, r.david.murray, studioes
Date	2018-02-01.16:40:43
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1517503243.16.0.467229070634.issue32572@psf.upfronthosting.co.za>
In-reply-to

Content
I understand that it is best to use PASV. But this FTP server is managed by another person, and that server required active mode. Also, my host is in a VPC environment, it is connected by 1:1 NAT. This NAT BOX does not support FTP transparent. In this case, we recognize that IP packet received by the FTP server is from the external IP address of the NAT BOX, but ftplib will send the IP address on host NIC. So dose not match IP packet source address and PORT address, it will be closed with the indicated code. The purpose of this feature is to communicate by overriding the IP address sending by PORT command with the NAT external IP address(so the client IP address seen by server).

Content

I understand that it is best to use PASV.
But this FTP server is managed by another person, and that server required active mode. 
Also, my host is in a VPC environment, it is connected by 1:1 NAT. This NAT BOX does not support FTP transparent.

In this case, we recognize that IP packet received by the FTP server is from the external IP address of the NAT BOX, but ftplib will send the IP address on host NIC.
So dose not match IP packet source address and PORT address, it will be closed with the indicated code.

The purpose of this feature is to communicate by overriding the IP address sending by PORT command with the NAT external IP address(so the client IP address seen by server).

History
Date	User	Action	Args
2018-02-01 16:40:43	studioes	set	recipients: + studioes, giampaolo.rodola, r.david.murray, matrixise
2018-02-01 16:40:43	studioes	set	messageid: <1517503243.16.0.467229070634.issue32572@psf.upfronthosting.co.za>
2018-02-01 16:40:43	studioes	link	issue32572 messages
2018-02-01 16:40:43	studioes	create