Small problem with expanding my network

[Cricket_Lover]

I have a home network (which I administrate), and it's layout (what you need to know) is as such (the network is actually larger):

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192.168.0.1 (gateway)
|-192.168.0.157 (hpDesktop)
|-192.168.0.18 (cWindowsWLAN)
'-192.168.0.250 (Linux)

I am moving the "cWindowsWLAN" computer to my room. The problem is, the wireless signal is not strong enough to reach my room (the WLAN adapter on the Linux box is in the hallway with a very long USB cable). I will also sometime have a third computer there, so I grabbed a spare router we had in the house.

I am trying to get the network set up so it would be like

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192.168.0.1 (gateway)
|-192.168.0.157 (hpDesktop)
'-192.168.0.250 (Linux)
  '-192.168.0.100 (router)
    |-192.168.0.10 (cWindowsLAN)
    '-192.168.0.? (new computer)

So I go and set up bridging on the Linux, and it can reach the router and the main network. HOWEVER, the main network does not see the router.

Any other ideas? I need the network to be set up as is in the latter diagram, with the only wireless link between "gateway" and "Linux"

And yes, I have to have those IPs accessable throughout the network

[Cricket_Lover]

(is there an Edit function?)

I just reestablished the bridge with the following commands: (eth0 is LAN, ra0 is WLAN)

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# brctl addbr br0
# brctl addif br0 eth0
# brctl addif br0 ra0 ; ifconfig ra0 0.0.0.0 ; ifconfig eth0 0.0.0.0 ; ifconfig br0 192.168.0.250 ; route add default gw gateway

Pinging targets:

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PING gateway (192.168.0.1) 56(84) bytes of data.
64 bytes from gateway (192.168.0.1): icmp_seq=1 ttl=64 time=4.66 ms
...
PING cWindowsWLAN (192.168.0.18) 56(84) bytes of data.
64 bytes from cWindowsWLAN (192.168.0.18): icmp_seq=1 ttl=128 time=64.6 ms
...
PING hpDesktop (192.168.0.157) 56(84) bytes of data.
64 bytes from hpDesktop (192.168.0.157): icmp_seq=1 ttl=128 time=3.92 ms
...
PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data.
64 bytes from 192.168.0.100: icmp_seq=1 ttl=150 time=0.617 ms
(the computer is not moved yet)
From hpDesktop:

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Reply from 192.168.0.1: bytes=32 time=9ms TTL=64
...
Reply from 192.168.0.18: bytes=32 time=1ms TTL=128
...
Reply from 192.168.0.250: bytes=32 time=7ms TTL=64
...
Request timed out.
(last ping was to 192.168.0.100)

My routing table:

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Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.255.0   U     0      0        0 br0
loopback        *               255.0.0.0       U     0      0        0 lo
default         gateway         0.0.0.0         UG    0      0        0 br0

My iptables (I know, no firewalling, and it seems to have all my port openings...):

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# iptables --list
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             loopback/8
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     all  -f  anywhere             anywhere
ACCEPT     udp  --  anywhere             anywhere            udp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:domain
ACCEPT     udp  --  anywhere             anywhere            udp dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
ACCEPT     udp  --  anywhere             anywhere            udp dpt:http
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:http
ACCEPT     udp  --  anywhere             anywhere            udp dpt:https
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:https
ACCEPT     udp  --  anywhere             anywhere            udp dpt:ftp
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ftp
ACCEPT     udp  --  anywhere             anywhere            udp dpt:ftp-data
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ftp-data
ACCEPT     icmp --  anywhere             anywhere            icmp echo-reply
ACCEPT     icmp --  anywhere             anywhere            icmp destination-unreachable
ACCEPT     icmp --  anywhere             anywhere            icmp echo-request
ACCEPT     icmp --  anywhere             anywhere            icmp time-exceeded

Chain FORWARD (policy DROP)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

(I am thinking the problem is with chain FORWARD, but I do not know how to fix; I haven't messed with iptables myself, except with my open all ports script)

Any input on problem or how to fix?