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NotMine
Contributor

Default routes and WAN Load Balancing

Hello everyone,

 

Can someone explain to me why I can't add two default static routes with the destination 0.0.0.0/0.0.0.0 when there is a default route via a WAN Load Balancing "interface"?

 

For example, here's my WAN LB configuration:

 

 

Here's how the routing table looks like (please disregard the missing gateway):

 

This is how the new default route should look like:

 

 

And here's the error I get when I click OK on the previous screenshot:

 

 

This is the system info:

 

Thank you,

Slavko

NSE 7

All oppinions/statements written here are my own.

NSE 7 All oppinions/statements written here are my own.
2 Solutions
Dave_Hall
Honored Contributor

slavko wrote:

:) Tried that already. Won't let me. When I send the end, it prints out an error message. That's why I'm here. :)

This is odd.  What happens if you disable the load-balancing interface(s) first and/or load the config into a text editor, add the route, load it back into the fgt. 

 

I am assuming port10 is your backup link?  If it's not, I would set the dest IP/mask to the network (mask) used on that interface.

NSE4/FMG-VM64/FortiAnalyzer-VM/6.0 (FWF30E/FW92D/FGT200D/FGT101E/FGT81E)/ FAP220B/221C

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NSE4/FMG-VM64/FortiAnalyzer-VM/6.0 (FWF30E/FW92D/FGT200D/FGT101E/FGT81E)/ FAP220B/221C
Jzhang_FTNT

Wan Load Balance feature designed to load balancing outgoing traffic over its member interfaces per ECMP and load balancing algorithm. so usually a static/default required to configured over wan-load-balance/virtual-wan-link to make ECMP happened. 

If another default route allowed, may mean one more ECMP route added, FGT will face the dilemma of load balancing between Wan Load Balance member interfaces or with the one more interface.

if you just want add one more backup interface, you can put it into wan load balance with different distance or priority setting

 

I think this is the design idea.

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11 REPLIES 11
ede_pfau

Same problem, same reason:

There can only be ONE default route per system.

 

And yes, the LLB ports probably needed gateway addresses but that's not the crucial point here.

 

Check your network flow design if you need more than one default route ("route of last resort" - how many "last resorts" are there?).

 

And please, don't yell in posts. If you want to attract attention then please open a post of your own.

Ede Kernel panic: Aiee, killing interrupt handler!
Ede Kernel panic: Aiee, killing interrupt handler!
dphills

I am having the same issue.  I need to add a second default route for failover purposes.  The second default route will be at a higher distance.  I'm using the spillover functionality on the WLB, so I would prefer to keep that functionality.  I'm surprised Fortinet hasn't fixed this by now.

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