Dual WAN Fail Over still using secondary WAN

[rtadams89]

I'm running 384.10_2 with dual WAN setup in fail-over mode. The backup WAN connection is an Ethernet connected 3G modem. Since setting up the dual wan, I have been seeing a consistent 1.6MB/day usage as reported by the 3G ISP. If I disconnect the Ethernet link from the modem to the router, this usage drops to 0MB/day, which confirms it is traffic coming form the router and not the modem.

Anyone else see this behavior? Any idea what on asuswrt-merlin would be generating this traffic?

 

[dokape]

The not used WAN is in Cold Standby. If I disconnect in on my DUAL-WAN Setting (remove RJ45), or if I reboot the second modem (cable in my case) the fallback switches to disconnect.
I guess there is still a keep/check-alive for the secondary WAN.

 

[rtadams89]

I think that was just a check if the cable is connected, not a check all the way through to the internet. If I configure my 3G modem to not connect to the cell provider, Asuswrt-Merlin still shows as cold standby.

 

[rtadams89]

Any other thoughts on this?

 

[El Mariachi]

When you configured your dual WAN it asks you a notable question which is; how frequently to ping a server via that connection to see if it is still alive. Each ping will use data. Multiply that out by the frequency of your pings and you would get a small data usage number somewhere around there assuming it is a basic packet ping.

EDIT: If you are not entirely sure how to properly set this up follow this: https://www.asus.com/support/faq/1011719

 

[rtadams89]

I initially thought maybe it was pinging over the secondary, fall back route....however, per my previous response, if I disable data on the 3G modem, the router shows no status change on the secondary connection. If it was actually doing pings over the secondary connection, it should show a status change when the data connection is disabled on that secondary connection.