Our investigation has revealed that there might be a SFP+ compatibility issue with specific CRS317-1G-16S+ units when connected to other CRS3xx devices resulting in random link downs. Please, contact MikroTik support if you experience similar issue, we will verify it and arrange a repair if necessa...

It's might not be always like that. My problem lasted for weeks, then it suddenly disappeared and now emerged again after 10 days. Now it has been flapping again for a second day in the row. This kind of problems can take a lot of time if there's no ways to "accelerate" the process...

spacex nmt1900 Make sure that your monitored device "IP-SNMP communities" and The Dude "server settings" SNMP custom profile does not have any mismatch. There is no mismatch and these community settings have been used for long time. Only Dude fails and it worked fine with 6.44.3. After testing it l...

spacex nmt1900 Make sure that your monitored device "IP-SNMP communities" and The Dude "server settings" SNMP custom profile does not have any mismatch. There is no mismatch and these community settings have been used for long time. Only Dude fails and it worked fine with 6.44.3. After testing it l...

It might not always be hardware related problem. I had this problem recently with 6.43.14 on RB1100AHx4, which has redundant dual power supplies and is powered from two separate UPS devices - so there is practically no possibility for real power outage, because other devices which are fed from the s...

It looks like SNMP access from Dude works OK with SNMPv1 or SNMPv2c. Maybe something with SNMPv3 authentication or encryption is wrong in Dude? It looks like Dude has problems with SNMP access. snmpwalk to other Mikrotik device causes this to appear in log of target device 10:22:24 snmp,debug unsupp...

nmt1900 - Can you reproduce this problem once more? Actually. sounds that this was simply a coincidence and the problem was caused by something else besides static ARP entries Router has one bridge with 2 addresses/subnets on it without VLANs and ARP in reply-only mode. Subnet 1 has DHCP with add-a...

RB1100AHx2 was last one with fans.

It is bad, when things get broken, but it is not better, when they suddenly get "cured" by itself. My problem just suddenly disappeared by itself. Link has been up from friday afternoon and all packet loss has also disappeared. Nobody has done anything to this link or the devices, nobody has even be...

It looks like Dude has problems with SNMP access. snmpwalk to other Mikrotik device causes this to appear in log of target device 10:22:24 snmp,debug unsupported v3 security level 10:22:24 snmp,debug v3 err: 0 unsupported security 10:22:24 snmp,debug bad packet and snmpwalk times out. We have LibreN...

Upgrade 6.44.3 -> 6.45.1

ARP in reply-only mode was used and static ARP entries had to be removed and added back to regain L3 access to other Mikrotik devices on the network (static IP addresses and these same static ARP entries).

RB750Gr3

RB260GSP and CRS112-8P-4S-IN have sfp ports, but S+85DLC03D is sfp+ module. Incompatibility seems to be at other end of the link.

Using modules like S-85DLC05D at both ends would solve the problem.

Now we did one test with the problematic link - we converted it to 10GbE with CAT7 and pair of RJ-10 modules. For more than hour of heavy load there was absolutely no link downs or any packet loss - so this is not likely related to topology issues etc. When we connected ports with fiber as before, a...

Same problem appeared suddenly after months of uptime. Two links between CRS326 and CRS317 (two of both devices) - one works perfectly and other link is flooding logs and causing packet loss. All troubleshooting attempts lead to conclusion, that CRS317 is the source of the problem - when we cross-co...

If we are talking about old RB1100 (the first generation), which has Atheros switch chips in it, then hardware offloading is possible with many configurations. However if device is latest RB1100AHx4, then hardware offload is possible only when STP is completely disabled. Same problem is with RB4011 ...

There seems to be one more thing to it... As I see here, CRS326 has one bridge with enabled VLAN filtering, while router RB1100 has bridges without VLAN filtering enabled. When I was testing CRS326 setups when VLAN-aware bridges first came out on RouterOS (with 6.41 probably), then I saw that switch...

This "improved stability on 802.11ac wireless devices" reminds me of one problem with 6.43.14. One site has quite a few wAP ac devices (QCA9550) and repeating scenario: CPU usage rises some time at weekend when no users are present and stays there (at about 5...10%). This rises temperature reading t...

If nslookup gives SERVFAIL as answer, then is it really related to old vs new cloud implementation? My device has 6.43.7 on it but DDNS lookup has been giving SERVFAIL results intermittently through today. Only Google DNS has been able to resolve all the time, but DNS of my ISP has mostly been not...

It seems to be "intermittent" problem - sometimes resolution of sn.mynetname.net works and sometimes it returns SERVFAIL...

After updating a RB3011 to 6.43.7 we lost connection, went to the site and after debugging and checking I discovered that there was a new dhcp-client at the config pointing to eth1 that wasn't there before update. In our case on eth1 we have our internet-provider router bridged connected via PPPoE,...

It might have something to do with IGMP snooping - if it's turned on (as it is by default on new bridges) then HW offload is deactivated. HW offload will be available after IGMP snooping is turned off on the bridge. It looks like only CRS series devices can have both at the same time. https://wiki.m...

I have similar (bad) experience with the new bridge and VLAN tagging. The first attempt to convert my initial multi-bridge setup to a single bridge with VLAN tags failed. I reverted to my pre-6.41 configuration (separate bridge for each VLAN and switch configured for the VLANs and tagged/untagged p...

Setting up multiple CAPsMAN controllers on same network seems to be a topic of quite scarce availability of information. I am having a setup in works with one network segment behind wifi link connection and this might be in need of second CAPsMAN controller for failover. Configuration basics seem to...

Big problem! Compatibility problems with older RouterOS versions. I had one CRS226 with v.6.30 and was not able to configure VLANs in switch mode. It works with WinBox 3.7, but with 3.10 it looked like switch was in router mode i.e. there was no VLAN menu under 'Switch'. I was unable to understand w...