How to NAT The FTP-DATA Connection?

[Robinson, Eric]

>load the ftp helper module. I thought it was loaded automatically 
>when you ran ipvsadm with ftp as a virtual service.

The following shows that the ftp helper module (ip_vs_ftp) is in fact
loaded.

[root at lb1 ~]# modprobe -l|grep ftp
/lib/modules/2.6.17.11/kernel/net/ipv4/ipvs/ip_vs_ftp.ko
/lib/modules/2.6.17.11/kernel/net/ipv4/netfilter/ip_conntrack_tftp.ko
/lib/modules/2.6.17.11/kernel/net/ipv4/netfilter/ip_conntrack_ftp.ko

So why would it not be working? Network traces on the client machines
show the FTP-DATA connection is not being NATed.

Here's the output from ipvsadm if it helps:

[root at lb1 ~]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  extrovert.mycharts.md:ftp wlc
  -> appftp2(FQDN censored):ftp      Masq    1      0          0
  -> appftp1(FQDN censored):ftp      Masq    1      0          0




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