I am experiencing these issues when testing our cellular failover on a MX84 with a UML290 and USB730L.
Both cellular devices work perfectly when connected to a laptop and are setup to connect automatically.
When plugged into the MX84 they both are in the ready state and when I disconnect primary WAN the MX84 does fail over to cellular modem but I am not able to browse to any new websites. The pages just time out.
If I happen to have websites open prior to the failover I am able to browse through the sub pages but any links to pages outside of that site time out as well.
While on cellular failover I can ping and trace route to any website from my workstation. I am also able to get emails and instant messages to come through.
I was able to test the device in another MX84 that I replicated as much as possible the configuration from the MX having the issue above and the device worked without any issues.
What settings would be a good starting point to review given the non working behavior above?
It sounds to me like DNS is failing.
When running on celluar and you do an nslookup for a site you have not been too - does that fail?
Are you using manually assigned DNS servers by chance?
Nslookups completed as well. I was using internal dns servers behind the mx as well as using google dns servers when I was directly connected to one of the mx lan ports.
Have you got any cellular firewall rules defined?
No and I have the cellular bandwidth set to unlimited.
Is that MX in NAT- or No-NAT mode?
Not sure. I am on firmware 14.40 and don’t see that option.
Ok, then it‘s NAT mode, you need 15.x Beta code to disable it. In this case, my idea is unfortunately invalid.
@PhilipDAth Another user replied to the post below with a similar issue I am having. I however did not have any flow preferences on any of my networks that I am experiencing this issue. I'm just wondering if there is a setting with the S2S VPN that could be causing my issue as well.
https://community.meraki.com/t5/Security-SD-WAN/Cellular-and-VPN-in-MX/m-p/4836