Hi

Interface Internet
ip address on interface
10.10.10.67/24
20.20.20.67/24

bgp peer remote address 10.10.10.68, update-source=Internet

whilst doing a tcp dump on 10.10.10.68, I could see BGP packets coming from 10.10.10.67 and from 20.20.20.67 it seemed to alternate and it stopped the BGP peer connecting.

the auto route create is

10.10.10.0/24 Internet prf-src 10.10.10.67

so why is the bgp peer sending from 20.20.20.67

RouterOS 6.37.1
I

Is this a bug or ??

Hi.

I think with 2 IP address in a single interface will confuse many protocols, even BGP. In other vendors this is not possible for this reason. In MikroTik You usually use vlan or bridge interface to have this funcionality.

update-source works better when it belongs to a bridge interface. Maybe if you have to use both address, you could use a single IP for ethernet interface and the other in the bridge interface.