All of your problems seem related to your dc0 interface.
What is the output of `ifconfig -a` on your system?
-------------------------------------------------------------
For those not familiar with Xorp:
Xorp is the eXtensible Open Router Platform.
Xorp is a software-based routing daemon which supports BGP, RIP, PIM-SM, and IGMP/MLD.
-------------------------------------------------------------
andrea, have you considered trying Quagga, Zebra, or BIRD instead?