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MikroTik App
 
3JL
just joined
Topic Author
Posts: 6
Joined: Fri Feb 09, 2024 4:42 pm

Switch works, except for internet

Fri Feb 09, 2024 4:56 pm

Hi, I am new to MikroTik, so I may be doing something straight up stupid :D

I have a MikroTik CRS312-4C+8XG running as a switch on RouterOS 7.13.4.
Uplink on SFP+ port 1 to a Unifi switch and gateway.

Interestingly / annoyingly:
  • Internet works upstream (in the unifi part of the network)
  • Internet sometimes works from the Mikrotik switch but drops off now and then (and it has been down for a while now)
  • I can access my entire network from the Mikrotik switch, but not the internet
  • When trying to checking for updates on the switch, I get a 'could not resolve dns name' error
This would suggest to me a DNS issue, but have not been able to resolve it.. Any suggestions?
(I have tried purging the DNS cache, without effect.)

See below more details. Thanks!
[admin@MikroTik] > /interface print 
Flags: R - RUNNING; S - SLAVE
Columns: NAME, TYPE, ACTUAL-MTU, L2MTU, MAX-L2MTU, MAC-ADDRESS
 #    NAME    TYPE    ACTUAL-MTU  L2MTU  MAX-L2MTU  MAC-ADDRESS      
 0  S combo1  ether         1500   1584      10218  2C:C8:1B:DB:75:56
 1  S combo2  ether         1500   1584      10218  2C:C8:1B:DB:75:57
 2 RS combo3  ether         1500   1584      10218  2C:C8:1B:DB:75:58
 3 RS combo4  ether         1500   1584      10218  2C:C8:1B:DB:75:59
 4  S ether1  ether         1500   1584      10218  2C:C8:1B:DB:75:4E
 5  S ether2  ether         1500   1584      10218  2C:C8:1B:DB:75:4F
 6 RS ether3  ether         1500   1584      10218  2C:C8:1B:DB:75:50
 7  S ether4  ether         1500   1584      10218  2C:C8:1B:DB:75:51
 8  S ether5  ether         1500   1584      10218  2C:C8:1B:DB:75:52
 9  S ether6  ether         1500   1584      10218  2C:C8:1B:DB:75:53
10  S ether7  ether         1500   1584      10218  2C:C8:1B:DB:75:54
11  S ether8  ether         1500   1584      10218  2C:C8:1B:DB:75:55
12  S ether9  ether         1500   1598       2028  2C:C8:1B:DB:75:5A
;;; defconf
13 R  bridge  bridge        1500   1584             2C:C8:1B:DB:75:56
[admin@MikroTik] > /ip address print 
Flags: D - DYNAMIC
Columns: ADDRESS, NETWORK, INTERFACE
#   ADDRESS            NETWORK        INTERFACE
0 D 192.168.241.52/24  192.168.241.0  bridge   
[admin@MikroTik] > /ip route print 
Flags: D - DYNAMIC; A - ACTIVE; c - CONNECT, d - DHCP
Columns: DST-ADDRESS, GATEWAY, DISTANCE
    DST-ADDRESS       GATEWAY        DISTANCE
DAd 0.0.0.0/0         192.168.241.1         1
DAc 192.168.241.0/24  bridge                0
[admin@MikroTik] >  
 
IlKa
newbie
Posts: 38
Joined: Sun Jan 03, 2021 11:42 pm

Re: Switch works, except for internet

Sun Feb 11, 2024 4:52 am

I assume that your gateway is `192.168.241.1`, right? Do you see its mac address in ARP? Can you ping it?

Since Mikrotik works as plain L2 switch here (and doesn't do any routing) I doubt that it affects your Intertnet connection somehow (unless you have broken cables or ports of course).

As for DNS error, you should set DNS server of Mikrotik itself, try `1.1.1.1` or `8.8.8.8` or the one provided by your ISP:
https://help.mikrotik.com/docs/display/ ... figuration

Which one is used by computers in your LAN btw?
 
3JL
just joined
Topic Author
Posts: 6
Joined: Fri Feb 09, 2024 4:42 pm

Re: Switch works, except for internet

Tue Feb 13, 2024 6:09 pm

Ok, after extensive frustration, and breaking the whole thing at some point, it works again, but only at 1 GbE :s
Since this is possibly a different issue, I will start a new thread.
Thanks @IIKa!