How to remove wrong dynamic-servers from /ip dns?

RouterOS General
1

Hi, I have the same problem in several routers:

I have a router in London where I used for a short time my cellular phone via USB cable, and via dhcp-client the DNS addresses of my provider went into /ip dns dynamic-servers…

Several months and reboots from then they are still there, in spite of the fact that the ISP dns does not answer when conacted from outside its network… so, seen from a upstream router:

[admin@MikroTik] > /ip firewall connection print interval=1 where dst-address~"80.58"   
Flags: E - expected, S - seen-reply, A - assured, C - confirmed, D - dying, F - fasttrack, s - srcnat, d - dstnat 
 #          PR.. SRC-ADDRESS           DST-ADDRESS           TCP-STATE   TIMEOUT     ORIG-RATE REPL-RATE ORIG-PACKETS REPL-PACKETS
 0    C  s  udp  192.168.88.217:5678   80.58.61.254:53                   9s            1024bps      0bps       13 721            0
 1    C  s  udp  192.168.88.217:5678   80.58.61.250:53                   8s            1024bps      0bps       13 721            0

It keeps trying to contact them months after.

Isn’t there a way to remove those so called “dynamic-servers” which are proving to be more static than the static ones, from there?

2

Dynamic DNS servers are added by DHCP/PPPoE/… and they don’t stick. Stop the client or uncheck the option to add them, and they go away. If not, it would be bug.

3

It is a bug, then, as they have been around for months, after reboots and whatnot. My guess is that if one disables the dhcp-client / pppoe-client while the lease is active they stick forever… I still would like to know how to remove them.

4

Have a look at my PPPoE configuration:
DNS1.jpg
so I do not have dynamic servers DNS entry:
DNS2.jpg
When I check the box “Use Peer DNS” it is on the list in a moment.

5

Have a look at these posting(s):

http://forum.mikrotik.com/t/disabling-o-removing-dns-dynamic-servers/131968/17