Draytek 2926AC Port Redirection lost when Failover activates

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SUMMARY

The DrayTek Vigor 2926AC router experiences a failure in Port Redirection when switching from the primary Ethernet WAN to a 4G Failover WAN. This issue arises because the 4G connection typically operates under a private IP address, preventing effective port forwarding. Users have confirmed that restoring the primary WAN reinstates the Port Redirection functionality. The problem is not a design flaw but rather a limitation of the 4G network's NAT configuration.

PREREQUISITES
  • Understanding of DrayTek Vigor 2926AC router configuration
  • Knowledge of WAN failover mechanisms
  • Familiarity with NAT (Network Address Translation) concepts
  • Basic understanding of APN (Access Point Name) settings and their impact on connectivity
NEXT STEPS
  • Research DrayTek Vigor 2926AC advanced routing features
  • Learn about NAT configurations in 4G networks
  • Investigate alternative APN settings for better port forwarding
  • Explore WAN failover best practices for home and small business networks
USEFUL FOR

Network administrators, IT professionals, and anyone managing DrayTek Vigor routers who need to optimize WAN failover and port redirection settings.

JDD
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I have a DrayTek Vigor 2926AC router that has an Ethernet feed as it's primary WAN and a 4G router (factory default settings + APN) as the Failover WAN.

I also have Port Redirection set up in the DrayTek 2926AC.

When I disable the primary WAN, the failover WAN activates and the internet is restored HOWEVER the Port Redirection fails.

When I restore the primary WAN, the Port Redirection also comes back.

Anyone know if this is a design flaw?

Or does someone have a workaround?

Thanks!
 
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Welcome to the PF. :smile:
JDD said:
I have a DrayTek Vigor 2926AC router that has an Ethernet feed as it's primary WAN and a 4G router (factory default settings + APN) as the Failover WAN.

I also have Port Redirection set up in the DrayTek 2926AC.

When I disable the primary WAN, the failover WAN activates and the internet is restored HOWEVER the Port Redirection fails.

When I restore the primary WAN, the Port Redirection also comes back.

Anyone know if this is a design flaw?

Or does someone have a workaround?

Thanks!
Have you tried posting this question at Stack Overflow? This is a pretty specialized question...
 
JDD said:
Anyone know if this is a design flaw?

Or does someone have a workaround?

Thanks!

It's not easy to respond with so little informations anyway...

Normally main wan are connected to ISP router that give us an public IP, while your local devices are natted so it's possible to use forward rules to assign IP:port external traffic to an IP:port internal and vicecersa.

Backup wan connections on 3G/4G are in a private cell network so, all connected device sharing a single public IP, so it's impossible to have port redirection.

Same things happen with some ISP that create a single natted zone for many client, so anyone has it's internal unique IP but all with the same public IP.
 
@ Staff: Mentor

Done.

Thanks.
 
@Roberto Teso

With some cell carriers you can just change the "APN" settings, and then have NAT / Port forwarding / DMZ .

I did this and still the problem persists.
 
JDD said:
@Roberto Teso
With some cell carriers you can just change the "APN" settings, and then have NAT / Port forwarding / DMZ .
I did this and still the problem persists.

Yes, but this depend on the 3G/4G provider and/or your contract and this is different nation to nation.

Here, in Italy, personal contract have restricted APN, only professional contract can have an unrestricted APN but not all providers offer this service.

I think it's best to ask to your carrier if they do on demand, cause it's obvious they don't by default.