FortiGate
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.
oconnort
Staff
Staff

Description
This article describes the reason why MD5 authentication is not possible.
Solution

To configure VRRP on an interface on FortiGate, the following options are available: 
 
# config system interface
# config vrrp
    edit <vrid>
set version [2|3]
set vrgrp {integer}
set vrip {ipv4-address-any}
set priority {integer}
set adv-interval {integer}
set start-time {integer}
set preempt [enable|disable]
set accept-mode [enable|disable]
set vrdst {ipv4-address-any}
set vrdst-priority {integer}
set ignore-default-route [enable|disable]
set status [enable|disable]
    next
end
 
It is not possible to configure MD5 authentication for VRRP on FortiGate. 
 
 
rfc3768 lists the following:
 
Note.
Earlier version of the VRRP specification had several defined authentication types [RFC2338]. 
These were removed in thisspecification because operational experience showed that it not providing any real security and would only cause multiple masters to becreated.
 
The authentication methods were supported in previous RFC: https://datatracker.ietf.org/doc/html/rfc2338
 
The implementation of VRRP on the FortiGate follows the new RFC.
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