Yes the Gateway should be set to 192.168.168.1 and PC set to 192.168.168.100
When connecting a miner to a PC I don't think there is any gateway involved, he should just set the IP address on and the sub netmask on the PC
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Have you tried just directly connected the miner to the PC? Assuming the LAN cable is a crossover type (most are) it should work.
In fact, the majority of LAN cables are straight-through,but that doesn't really matter since most devices nowadays can be connected using both straight-through and crossover since these new network interface controller can negotiate the parameters regardless of the connection type.
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only change the miner to use DHCP, save then reboot it.
Doesn't Avalon have an option to reset to DHCP using a physical procedure of some type? this seems like a lot of work just to get the miner to DHCP.
It just doesn't make any sense why DHCP won't work to connect to pools. I suppose it could be the controller or hashboards themselves
Unlikely, it's more likely to be a network-related issue, if you want, I can try to troubleshoot it for you via anydesk, you can PM me.