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

Wed Aug 14, 2019 5:20 pm

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

Wed Aug 14, 2019 6:45 pm

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.
People who quote full posts should be spanked with ethernet cable. Some exceptions for multi-topic threads may apply.
 
nostromog
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Re: How to remove wrong dynamic-servers from /ip dns?

Wed Aug 14, 2019 7:11 pm

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.
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.
 
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Panbambaryla
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Re: How to remove wrong dynamic-servers from /ip dns?

Wed Aug 14, 2019 7:21 pm

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.
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Best, Bam
 
msatter
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Re: How to remove wrong dynamic-servers from /ip dns?

Wed Aug 14, 2019 9:00 pm

Two RB760iGS (hEX S) in series. One does PPPoE and both do IKEv2.
Running:
RouterOS 6.46Beta / Winbox 3.19 / MikroTik APP 1.2.10
Having an Android device, use https://github.com/M66B/NetGuard/releases (no root required)

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