Trunking with d-link

Hi.

Anyone of you have any experienc with trunking with D-link switches?
What I'm trying to do is to use trunking between two DES-3828. I set
the ports for LACP protocol. The ports are active on one end and
passive on the other.

If I test it in a LAN it works fine, but when I try to set this up in
a WAN, the link works, but I have some problem with the connection (I
loose 5-10% of pings)...

Any experience to share?

Thanks,
Clip