I know this is very basic question, but I don't have prior experience of setting network environments with multiple routers and no matter what I try I can't get the configuration working.
So, I have two routers, A and B. A is a dumb fellow (no DDNS, VPN, etc. fancy features) provided by my ISP and its duty is to bridge PPPoE to router B (ASUS RT-AC68U) and provide telephone access (not possible with B). A must be connected directly to WAN. PPPoE bridge works fine, meaning that I can access internet from Subnet B and DDNS in router B works. However, I can't access either Internet nor subnet B from subnet A.
ping 10.0.0.1 from laptop throws
Transmit error: code 1231, and
ping 10.0.2.1 from PC throws
Destination net unreachable.
Router B has DHCP server running, whereas A does not, in order to make sure two DHCP servers don't mess up each other.
I tried adding static route to B (10.0.2.0/255.255.255.0 gateway: 10.0.2.1), but it didn't seem to work. I also tried adding static route to A (10.0.0.0/255.255.255.0 gateway: 10.0.0.1), but it didn't work either.
What kind of routing, gateway, etc. settings do I have to set in each router in order to get access between the subnets? Access to Internet from subnet A is not necessary. Instructions preferably in noob format, as I'm not expert when it comes to routers and routing.
Routing table of B:
Destination Gateway Genmask Flags Metric Ref Use Type Iface <external 1.> * 255.255.255.255 UH 0 0 0 WAN0 ppp0 10.0.1.2 * 255.255.255.255 UH 0 0 0 tun21 10.0.0.0 * 255.255.255.0 U 0 0 0 LAN br0 10.0.1.0 10.0.1.2 255.255.255.0 UG 0 0 0 tun21 <external 2.> * 255.255.0.0 U 0 0 0 MAN0 eth0 default <external 1.> 0.0.0.0 UG 0 0 0 WAN0 ppp0