Same problem with my router too, Merlin firmware version:386.1, Asus RT-AC88U.
Running "ntp -w -p pool.ntp.org" returns "Segmentation fault"
Running "ntp -w -p 162.159.200.123" returns "ntp: reply from 162.159.200.123: offset...""
Any sustainable solutions other than hardcoding IP address in...