Draytek 2926AC Port Redirection lost when Failover activates

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In summary, a user is experiencing a problem with their DrayTek Vigor 2926AC router when using a 4G router as the failover WAN. Despite setting up port redirection in the router, when the primary WAN is disabled, the failover WAN activates but the port redirection fails. When the primary WAN is restored, the port redirection also returns. It is unclear if this is a design flaw or if there is a workaround. The user has tried changing the APN settings but the problem persists. They may need to contact their 3G/4G provider for an unrestricted APN.
  • #1

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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  • #2
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...
 
  • #3
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.
 
  • #4
@ Staff: Mentor

Done.

Thanks.
 
  • #5
@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.
 
  • #6
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.
 

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