[B.A.T.M.A.N.] alfred and batadv-vis issue

Hello guys,

I setup a testbed like this. (BBN = backbone node)

Switch ---------->BBN1 --------------->MP1 | ------->BBN2---------------->MP2

MP1 and MP2 may select BBN1 or BBN2 as gateway. On both MP1 and MP2, I enable Alfred and batadv-vis as follows: alfred -i br0 -4 224.0.0.1 -m & batadv-vis -i bat0 -s

when I run batadv-vis again on MP1, I can't get the info from MP2. If I ping the ip address of MP2 from MP1, MP1 will get MP2's mac address by arp. And then I run batadv-vis again, I can get the data from MP2 now.

Is there any configure or method to get MP2's info without ping test?

Thanks, Gary