[j-nsp] M20 packet marking for IPv6 and IPv4

[Giuliano Cardozo Medalha]

Hi,

We need help about juniper M20 routers.

With a router with a Gigabit Ethernet IQ interface and POS STM-1 for WAN 
conection,
how is possible to mark packets IPv4 and IPv6 with DSCP field ?

What command should be used to mark IP packets on M20 router .... junos 
6.2 ?

Thanks a lot

Giuliano