[Gllug] Wireless to wired LAN router

[Simon Stewart]

Right, I'm obviously missing something obvious, so I thought that it's 
best to ask the experts. Apologies if this is something of a rather 
long email, but I'll try and put enough information in.

At home I have a wired LAN already, and I'm keen to set up a wireless 
LAN too. Addresses on the wired LAN (on which my ADSL router sits at 
192.168.1.2) are in the range 192.168.1.0/24. Wireless clients are 
allocated IPs in the range 10.1.0.0/24.

Obviously, I need to set up a machine that sits between the two 
networks and acts as a router. This has got two NICs in, one of which 
is wireless, one of which is not. The network config looks likes this 
(internally)

NET -> 192.168.1.2 -> 192.168.1.20 -> bix -> 10.1.0.1 -> 10.1.0.2
        Net GW         Wired NIC      router  Wireless    Wireless
                                                NIC       clients

Bix is the machine that I'm setting up as a router. It's running Debian 
2.4.19 and its routing table looks like:

Destination     Gateway         Genmask         Flags   MSS Window  
irtt Iface
192.168.1.16    0.0.0.0         255.255.255.255 UH       40 0          
0 eth0
10.1.0.1        0.0.0.0         255.255.255.255 UH       40 0          
0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U        40 0          
0 eth0
10.0.0.0        0.0.0.0         255.0.0.0       U        40 0          
0 wlan0
0.0.0.0         192.168.1.2     0.0.0.0         UG       40 0          
0 eth0

The wireless interface is in Ad-Hoc mode. From my iBook (10.1.0.2), 
which is the only wireless client I have atm, I can ping as far as the 
wired NIC on the router (that is, 192.168.1.20) and no further. From 
the Net GW I can ping as far as 10.1.0.1. Bix can ping every host on 
both networks, so it's not that something is running a firewall that 
doesn't let me ping anything. :)

The same behaviour is seen when /proc/sys/net/ip_forward is either 1 or 
0 on the router, and the kernel has been compiled with support for 
being an advanced router enabled.

What I really want to do is to allow all the hosts on both networks to 
see each other, so I'm not keen on setting up ip masquerading in order 
to get this working (where's the challenge in that?) Other useful 
information: the iBook claims to be in a "Computer to Computer" 
network, rather than a more normal "airport" network, but I understand 
this to mean that it's in ad-hoc mode too, rather than being some 
bizarre peer to peer config --- I haven't seen any docs saying 
otherwise.

Any ideas on how to sort this out? It'd be great to be able to get this 
going properly. If anyone can also give me some pointers on how to make 
bix appear as a full fledged access point, that would also be 
appreciated. I've already googled and found the "host ap" driver for 
the Prism 2 cards and even with this installed the iBook isn't fooled, 
but that's a problem for another day....

Cheers,

Simon


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