FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Article Id 230218
Description This article describes how to change the source ip of Fortigate SYSLOG Traffic.
Scope FortiGate running single VDOM or multi-vdom.

FortiGate will use the source IP by default, as one of the egress interfaces.
In order to source the traffic from a loopback or from a different interface, the following settings have to be enabled:

FortiGate with Single VDOM:


# config log syslogd setting
    set status enable
    set server "x.x.x.x"  ==>==> Syslog Server IP 
    set source-ip y.y.y.y ==>==> source ip to use 

FortiGate with Multi-vdom:
Firewalls with multi-vdom can have a specific Syslog server for each VDOM.


To enable vdom-specific Syslog Server, the following feature has to be enabled:

# config vdom
    edit <vdom_name>

    config log setting

        set syslog-override enable  <----- This enables VDOM specific syslog server.



To change the source-ip of vdom-specific syslog traffic:


# config log syslogd override-setting

    set server "x.x.x.x"   <----- Syslog Server IP.
    set source-ip y.y.y.y  <----- Source IP to use.