I'm running a linux Firewall (kernel 2.2.17) with IPChains (masq_ftp
installed). It connects the private Network to the Internet. Inside the
private network, there ist a Windows 2000 machine running the FTP-
Server included in the Microsoft IIS. To get a connection from the
internet to the FTP-Server I configured the following portmapping:
/usr/sbin/ipmasqadm portfw -a -P tcp -L $4 8021 -R ftp.xxxxx.de ftp
($4 is the public IP of the firewall, ftp.xxxxx.de the ftp-server)
When I try to get a connection via FTP it works just fine, unless I try
to get some data (ie command "ls"). The client doesn't get any respond.
A tcpdump on the firewall shows the following: The server gets the
request, tries to establish a ftp-data connection but the client
I know this is a well known problem because I discovered many articels
about this topic - only help requests, no answers...
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