I setup a lxc inside vm but now from lxc i can ping vm machine but not able to ping main host system and other system inside lan

i setup a lxc inside vm but now from lxc i can ping vm machine and other system inside lan but not able to ping main host system and from other system inside lan to lxc.
and another thing if i change lxc-net configuartion from 10.0.3.1 to 192.168.1.1 from /etc/default/lxc-net then not able to ping other system inside lan.
also in vm lxcbr0 is present
how solve this problem that from any system in lan be able to ping lxc’s ip address