DSCP PROBLEM

RouterOS General
1

Hi all. I have an interesting problem that hopefully someone can help with.

I am currently using an RB450G as a DHCP server for some Wimax gear that I have deployed. This Wimax equipment requires that it’s managment IP address be delivered via DHCP. It will only match to this DHCP if the DHCP offer has a DSCP value of 6 in the packet. To achive this I have created a mangle rule that changes the DSCP value of all outbound LAN traffic to 6. This appears to work on all traffic but the DHCP Discovery and Offer broadcasts. I am beginning to think that becuase these are Layer 2 broadcasts that the router will not even think about changing the default Layer 3 DSCP value of 0.

Has anyone else run into this? Any ideas? Any help would be greatly appreciated.

Thanks!

2

As an update… It looks that even when unicast DHCP traffic leaves the Mikrotik it is not changing the default DSCP value of 0 to the requested 6.

Can anyone please help! I don’t want to abandon Mikrotik in favor of Cisco, but I know that my Cisco gear can change these DSCP values.

Thanks for any input.