I have an external ASUS RT-AC5300 router connected to the VM SH3 in modem mode. Been working fine for over a year and then all of a sudden the router cannot connect to the internet and displays "Your ISP's DHCP does not function correctly". Communication issue between the modem and the router regarding DHCP :-( In my WAN setup I have connection type set to AUTOMATIC and wondering if it's due to the ASUS default DHCP range clashing with the VM SH3 DHCP modem mode range ? No expert and thinking of trying to set connection type to STATIC in my router with settings like:
More importantly has anyone had the same issue using an external router and VM SH3 ?
The hub in modem mode will serve a single DHCP address to your router. The hub/modem will have an admin interface on 192.168.100.1. But this is admin only. Not as suggested the default gateway. That will be supplied in the DHCP config.
It turns out that it was a problem with the Virgin Hub. I spent half an hour on the phone with Virgin Support. They eventually suggested doing a hard reset of the hub (pressing and holding the reset button for 40 seconds), and it resolved the problem.