Problems with DNS, LAN devices can't access internet

RouterOS General
1

Hi!
I have a mikrotik with 2 WAN Links. Link 1 is ISP with PPOE and Link 2 is Starlink (works with DHCP Client). Inside mikrotik i have normal internet access, but the devices connected in bridge can’t navigate internet, i believe it’s a DNS problem. The computers get correct IP from Mikrotik (DHCP Server).

I try 2 different ways:
1 → In PPOE and dhcp client connection i unchecked the option “User Peer DNS”, and put many DNS in “IP->DNS” section (Google, CloudFare, OpenDNS). Computers remained without internet access.
2-> I remove all DNS servers in “IP->DNS” and checked the “User Peer DNS” in PPOE and DHCP Client.

I have a “Masquerade Scrnat” rule in firewall to WAN interfaces.

What i’m doing wrong? Any ideas?

2

Without seeing the config NOpe.
/export file=anynameyouwish (minus router serial number, public wanip information, keys etc.)

3

I attached my .rsc file.
rp-config.rsc (6.94 KB)

4

Dont understand the purpose of vlan20 ? Starlink doesnt use vlans??

5

The use of the vlan has no relation to starlink. A few devices need to have another IP range (described there in IP → Address), so that third parties can read data from these devices through VPN.
I tried disabling this vlan to see if it is related to the DNS problem, but the problem persisted.

6

Well its confusing because you have it tied to the bridge but you dont have /interface bridge vlan settings NOR is is bridge vlan filtering enabled…

Personally I would delete everything that is non standard and simply have a config that has a simple LAN and your two ISP WANs and troubleshoot the config.
Once its working bring back all the raw rule and other crap polluting the config, vlan20 etc…

7

I found something.

If i change “masquerade srcnat” rule, keeping the option “out-interface-list” empty, the internet works.
if a put “out-interface-list” with WAN, which is a list with two link input ports, the internet stops.

What i’m doing wrong?

8

I have been fighting a starlink DNS issue. I know this sounds strange and I am hoping someone will point out why it is behaving this way.

I don’t know what hardware you have but on the interface facing the starlink can you go in and try turning off “Auto Negotiation” and just setting it to “1G baseT full”. I was having all sorts of DNS issues but things like ping worked fine. I thought it might have to do with MTU but that didn’t seem to make any difference when I adjusted it.

I had my starlink plugged into a RB2011-UAS-2Hnd-IN in bridge mode with no problems but as soon as I plugged everything into my CRS310-8G+2S+ I could not get any DNS resolution from the switch itself or get it pass any DNS traffic to a client on the switch. Setting the internet to negotiate to 100 full or turning off auto negotiation seems to fix it. I do not know why.

9

@lostgone → Start your own thread please.

@felipe Post your latest config

10

Start my own thread for what? I am not having any problems. I was posting what fixed my problem.

11

have been fighting a starlink DNS issue. I know this sounds strange and I am hoping someone will point out why it is behaving this way.

Sounds like your asking for help to me…but okay, maybe your not.
What a switch has to do with router issues is a bit strange to interject and you have no clarity in which device this adjustment was made.