Played with it for a while, installed second LDom and found that the two LDoms can see each other but none can talk to the control (primary) domain. It must have something to do with the virtual...
I've got Sun Fire T2000 with two LDoms - primary and ldom1, both being Solaris 10 u8. Both can be accessed over the network (ssh, ping), both can access the network, but they can't ping or ssh to...