Created on 03-13-2015 04:00 PM Edited on 05-22-2024 10:25 PM By Jean-Philippe_P
Description
This article illustrates one method to avoid IP address conflicts on a FortiGate unit.
Scope
FortiGate is being used as a DHCP server.
Solution
Background:
IP address assignments to end devices should be unique.
Most devices will only hold a single ARP entry for a given IP address. If two or more devices are configured to use the same IP address on the network, this is called an IP address conflict and results in intermittent connectivity issues.
Common Causes:
Typically IP conflicts are caused when either:
DHCP conflict detection in FortiOS:
FortiGates unit has a DHCP conflict monitor available.
Adjust the timeout under any DHCP server entry.
config system dhcp server
edit 1
set conflicted-ip-timeout <60 ~ 8640000 seconds (1 minute ~ 100 days)>
next
end
Possible Actions:
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