Making a Ad-Hoc Wlan access point (mixing Wlan and Lan)

[Remorse_Of_Nero]

Hi there

(this is kind of a poor mans howto )

Ive been trying to do this for the last three days and searched these forums and google and couldnt find anything usefull. I wanted the laptop to be able to access the internet connected supplied by an ADSL modem on another network (10.0.0.2) through a gentoo box
with a Wlan card (kinda acting as a acess point) installed working in Ad-Hoc mode

Tried making a bridge from Wlan0 / eht0, but couldn't make it work at all (I think you cant mix them). Most people talk about using a WLAN card with a prism chipset but I didnt have one

I have this setup:

ADSL-Router-10.0.0.2 <->HUB <->LAN 10.0.0.x<->10.0.0.9-eth0-Gentoo box-wlan0-10.0.1.1 < ~~> 10.0.1.10-wlan0 -laptop

All IPS static (dhcp doesn't work for the Wlan section)

But this is really easy when you know how:-

First make sure you have IP_FORWARD and stuff required for IPTABLES in the kernel on the gentoo-router and emerge IPTABLES (gies without saying )

and Ndiswrapper on all computers that want to use Wlan (really ...!!!! ) with the WLAN card driver installed

run this script on the gentoo-box when after booting (10.0.0.9- acting as a gateway for the
wlan netwok)

[Helper_Monkey]

thanks for this, I just tried it and it works great.
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[dreville]

Hi.
Thanks for these directions. Just wondering if somebody has figured out how to use DHCP with this setup.
Thanks.

[daeghrefn]

I have a similar setup with DHCP working. Here's how:

1. emerge dhcp
2. man dhcrelay, read up on it.
3. nano /etc/conf.d/dhcrelay. Modify the IFACE list to include BOTH interfaces, the wireless iface AND the interface that connects to the network with the DHCP server on it. Add the IP address of the DHCP server, and your options, that you picked out from the dhcrelay man page. (I use "-q").
4. Modify your IPTables rules (or shorewall rules, or other frontend application if you use one) to allow your "router" to accept DHCP on both interfaces. This means both tcp and udp port 67.
5. /etc/init.d/dhcrelay start If you have no errors that's a good thing.
6. rc-update add dhcrelay default To add dhcrelay to your bootup.
7. Modify your /etc/dhcp/dhcp.conf file on your DHCP server, not the router, to add a new subnet for your wireless segment. It needs to be the same range as the IP assigned statically to the wireless interface.
8. Restart dhcpd on the DHCP server to apply the configuration changes. Reload your IPtables rules (or restart shorewall, or whatever frontend you use).
9. Connect.

A few things. In my setup, my gentoo router is the main router. I have a NIC through which my modem connects, a NIC through which the LAN connects, and a wireless interface which is hosting the wireless subnet, via hostapd, not ad-hoc. Secondly, the DHCP server needs to know how to route the DHCP packets. If the ADSL router is the server's "Default Gateway" the ADSL router won't know where 10.0.1.0 is at, so you may have to add a kernel route to tell it where to go.

For troubleshooting, check the logs on the DHCP server to verify which packets it is receiving. You should see the handshakes for the request.

Hopefully I am not being too vague. If you have any specific questions, let me know.

Oh, and as a side note, the SIMPLEST solution is to just run dhcpd on the machine that is connected to both networks. I didn't set it up that way for personal reasons (I wanted to make dhcp relay work).

[thecooptoo]

thanks -I'll have a look next time openoffice needs upgrading.

Is the problem that you cant use CIDR notation in /etc/distcc/hosts. Should the docs explicitly say that ?
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[Lucipher]

Just an update and a question.

Update: you don't need to put your network card in promiscuous mode, at least I didn't.

Question: is there any way to put up the server automatically on boot?

What I did on my laptop's /etc/conf.d/net was: