Apologies again, I'm not reading you posts closely enough. Too many very similar filenames.
What's the output of:
cat /etc/resolv.conf grep -i mypc /var/lib/misc/dnsmasq.leases
admin@RT-AX86U-AR28:/jffs/scripts# cat /etc/resolv.conf nameserver 127.0.0.1
admin@RT-AX86U-AR28:/jffs/scripts# grep -i myPC /var/lib/misc/dnsmasq.leases 30089 f7:a4:67:4d:5f:8a 192.168.1.43 myPC 01:f7:a4:67:4d:5f:8a