How to config air between backup domains using multiple networks?

First backup domain:

msdp and master: master10

NIC1: 192.168.18.10 master10

NIC2: 10.0.0.20  master20

Second backup domain:

msdp and master : drmaster

NIC1: 10.0.0.30 drmaster

there is no route between 192.168.0.0/24 and 10.0.0.0/24,I want config air from drmaster to master10,This is mystep:

on master10:

add SERVER = drmaster to bp.conf

nbemmcmd -machinealias -addalias -alias master20 -machinename master10 -machinetype master

on drmaster:

add SERVER = master10  and SERVER = master20 to bp.conf

but when i Add a Trusted Master Server to drmaster,i get errors:

Remote master server could not establish AT trust from this master server(5604)

all iptables is stoped,what should i do?