Сейчас залез в лог микротика там пишет
oct/31/2017 03:10:24 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 04:11:54 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 05:12:41 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 06:12:41 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 07:13:37 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 08:13:41 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 09:13:57 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
oct/31/2017 10:14:54 dhcp,critical,error dhcp alert on ether6-masterLAN: discovere
d unknown dhcp server, mac 00:1E:67:19:D9:64, ip 192.168.10.111
это был старый dhcp, зашел на него вызвал ipconfig /all
проверил нет ли включеных dhcp, их нет
делаю nslookup из первой сети(192.168.5.100 это второй dns сервер
)