1 How to setup FTP proxying using the built in proxy code.
2 ========================================================
4 NOTE: Currently, the built-in FTP proxy is only available for use with NAT
5 (i.e. only if you're already using "map" rules with ipnat). It does
6 support null-NAT mappings, that is, using the proxy without changing
9 Lets assume your network diagram looks something like this:
14 ---+-------------+----------
18 ---+-------------+----------
22 and IP Filter is running on host B. If you want to proxy FTP from A to C
25 map int-c ipaddr-a/32 -> ip-addr-c-net/32 proxy port ftp ftp/tcp
27 int-c = name of "interface c"
28 ipaddr-a = ip# of interface a
29 ipaddr-c-net = another ip# on the C-network (usually not the same as the
32 e.g., if host A was 10.1.1.1, host B had two network interfaces ed0 and vx0
33 which had IP#'s 10.1.1.2 and 203.45.67.89 respectively, and host C was
34 203.45.67.90, you would do:
36 map vx0 10.1.1.1/32 -> 203.45.67.91/32 proxy port ftp ftp/tcp
41 ipaddr-c-net = 203.45.67.91
43 The "map" rule for this proxy should precede any other NAT rules you are