DHCP Client: No Default Route if server offers option 121

RouterOS General
1

Hi!

I have a strange behavior with one of my routerboards:
The RB get the IP address from a dhcp server. The server (Cisco L3 Switch) offers ip, default-gateway, dns, ntp and dhcp-option 121 (a static route). The last one is needed because every client need a route besides the default route to reach a certain network. Everything works fine with the windows and linux clients, but then i want to connect a routerboard to the network:
I configured the dhcp-client, it get an ip adress, add the route from dhcp-option 121, but it will not add the default route! And, yes, i have set the option “Add default route” in the dhcp-client configuration. Unsetting this option will delete the dynamic learned route from option 121 :confused:
The thing is: After removing dhcp-option 121 from the server configuration, the RB creates the default route. Somebody has a clue how to fix this?
I need the default route AND the route set via option 121.

2

default route should be included in option 121. In case it is not possible (for compability with other vendors) we also added new feature in v6
/ip dhcp-client add add-default-route=special-classless

this option will install default rotue even if it is not present in option 121.

3

ahh, that’s it. Version 6 solved the problem.
Unfortunately cisco do not allow a default route in option 121.

Thanks!