Router RB450 and 750 MAC 00:00:00:00:00:00

Hardware MikroTik hardware general
1

Dear All

I have upgraded (version 6.33.5, 6.34.45) my all routers ( 70 units) after i found that from my clients coming MAC 00:00:00:00:00:00
I am trying role back to old version but no result , please help

Zero mac in ARP list ?
2

Easy test which you can execute to see this behaviour and understand that it is normal:

  1. Make link on some interface so it would be in running state;
  2. Add address on this interface 172.16.1.1/24;
  3. Now run ping to 172.16.1.2 (address must not exist in network);
  4. Ping will not go because 172.16.1.2 does not exist and ARP list will now have ARP entry for 172.16.1.2 00:00:00:00:00:00
  5. After a timeout this entry will disappear.

This is how it works:

  1. You search for x.x.x.x IP;
  2. ARP creates entry with x.x.x.x IP and represents MAC as 00:00:00:00:00:00;
  3. Now if address is found then 00:00:00:00:00:00 is replaced with its MAC if not then it stays like that until entry is timed out.

It is how other system also work. Simply we did not show them in past and people where asking - why do I see 20 entries in ARP list but list shows that its length is 100? It was because there were 80 incomplete ARP entries in background.

3

I have downgraded to version 6.32.3 now all is fine, i can send sipout also

4

Facepalm.

But thanks for the useful for another members info, strods.