PIX and problem of virtual FTP hosts
I have a Cisco PIX (version 6.3 (3)) behind which I have all my ISP customers. I have a web server outside the PIX hosting various web sites on an IP (virtual hosts). People outside the PIX can send via FTP on the web server without any problems. People inside the PIX cannot. We have this problem until I started using virtual servers on the server FTP and assignment of different FTP port numbers for each of the web sites. (We only had a single site on the web server until a few days ago.) I guess it's a problem of PIX because that's the only difference between access to the FTP server for my customers of the ISP with non. So, my question is that I have to open also the new FTP on my PIX port numbers? I already have "fixup protocol ftp 21". I should add similar statements for each of the new higher ports? I'm new to using a PIX; We didn't cover them in my CCNA and CCNP courses. Also, I can FTP virtual hosts located on other servers of Internet service providers, which makes no sense to me. Thank you.
Hello
I assume by "higher port numbers" are the new ftp servers listening on ports other than the default port 21. If this is the case, then you are quite correct to say you need to add the correction commands more.
The active way FTP works is that a control connection is established between the client and the server over tcp 21, and then they negotiate a data port. The * server * then initiates a connection to the customer on this port.
Normally, this isn't a problem for the pix, because he looked at the control connection on port 21 and understood that it was necessary to open a hole for the connection on the new port, but if you do ftp on ports other than 21, you must specify the pix 'look' that port as a ftp control connection so it can then open the firewall for the data connection.
You can verify the fix here
The short but you need an outgoing access list for the new ftp port entry (say it's 2525), then to consult as if it were the ftp, the command "fixup protocol ftp 2525"
-Jason
Be sure to note if it helps.
Tags: Cisco Security
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