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LTE modem as failover internet

I am trying to set up LTE modem (Yealink B535-333) as failover internet on my SonicWall TZ500. My mobile internet provider provided a static IP address for on SIM card.

I've put the modem in bridge mode and tested it on my computer. It worked perfectly - I get a public static IP address assigned from my provider, can ping and access computer from internet.

When I connected the modem as WAN port on SonicWall with DHCP I get internet for about 5 minutes (pingable from internet) and than it stops working. If I use the same IP as static I get about 8 pings worth and than it fails.

Any idea why?

Category: Entry Level Firewalls
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