I'm now on a router in 3 networks, where eth0 and eth1 are in 2 LANs and eth2
are in a WAN. Here are the details:

root@debian:/home/michael# ifconfig
eth0 Link encap:Ethernet HWaddr 00:e0:4c:4d:77:06
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:4cff:fe4d:7706/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:735444 errors:0 dropped:0 overruns:0 frame:0
TX packets:1216737 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:89416295 (85.2 MiB) TX bytes:1427122256 (1.3 GiB)
Interrupt:20 Base address:0xcc00

eth1 Link encap:Ethernet HWaddr 00:50:bf:70:fc:e4
inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::250:bfff:fe70:fce4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:81044 errors:0 dropped:0 overruns:0 frame:0
TX packets:156456 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6883331 (6.5 MiB) TX bytes:226037112 (215.5 MiB)
Interrupt:22 Base address:0xe800

eth2 Link encap:Ethernet HWaddr 00:1e:90:90:23:7d
inet addr:210.6.148.56 Bcast:210.6.148.127 Mask:255.255.255.128
inet6 addr: fe80::21e:90ff:fe90:237d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3105649 errors:0 dropped:0 overruns:0 frame:0
TX packets:1551451 errors:0 dropped:0 overruns:0 carrier:3
collisions:0 txqueuelen:1000
RX bytes:2449847469 (2.2 GiB) TX bytes:394544116 (376.2 MiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:42718 errors:0 dropped:0 overruns:0 frame:0
TX packets:42718 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6858552 (6.5 MiB) TX bytes:6858552 (6.5 MiB)

root@debian:/home/michael# ip route show
default via 210.6.148.1 dev eth2
192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.1
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1
210.6.148.0/25 dev eth2 proto kernel scope link src 210.6.148.56
root@debian:/home/michael# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1
root@debian:/home/michael# iptables --list-rules
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
root@debian:/home/michael# iptables -t nat --list-rules
-P PREROUTING ACCEPT
-P INPUT ACCEPT
-P OUTPUT ACCEPT
-P POSTROUTING ACCEPT
-A POSTROUTING -o eth2 -j MASQUERADE
root@debian:/home/michael# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 210006148001.ct 0.0.0.0 UG 0 0 0 eth2
192.168.0.0 * 255.255.255.0 U 0 0 0 eth1
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
210.6.148.0 * 255.255.255.128 U 0 0 0 eth2

I can access all the 3 networks from the router. Moreover, I can access the
Internet from all the LANs. However, I can't access the 192.168.1.0/24 network
from the 192.168.0.0/24 network, and vice versa. That means the packets are
not forwarded properly between eth0 and eth1 in the router.

Now I want to make the 2 LANs accessible to each other, what should I do?

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