I have a question regarding redirecting TCP traffic going to mailserver
which should be redirected to a antispam system.
Currently they reside on the internal network which consists of public ip addresses
and in front there is an Fortigate firewall in transparent mode.
I wish to redirect traffic coming from external interface to mailserver to antispam system, and only traffic coming to port 25 (smtp) should be redirected.
It is possible to change to routing mode and i can change IP subnet for antispam system but i do not wish to move the public ip addresses to VIP' s on the external interface.
INTERNET = WAN1
SERVERS and ANTISPAM = INTERNAL
FGT in transparent mode (can be changed..)
Currently running FortiOS 4.3.9 but i can upgrade if there has come any new features in later releases.
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