Pf with multi gateways

[What you get is Not what you see]

Hi
I have a pf box with 4 links (a multihomed box ) and some services like
dns,dhcp on it.
I have set /etc/mygate to one of the gateways.
Sometimes the line drops and when it drops, obviously some services like
dns stop.
But the other lines are up then.
What is the proper way of handling mygate?
Do you suggest mpath?