Hi,

I’m trying to work out how to route all traffic destined for the internet from all devices connected to eth0 to a wireless router access point via wlan0 on my Slackware box.

I also have dhcpd providing ip addresses on the same subnet to any device connected to both eth0 and wlan0.

Diagram:
Code:
 ____________                                       ____________
[            ]=============> (wifi) ==============>[  Router /  ]
|Workstations|             __________              |Access Point| 192.168.2.1
[____________]==>(eth0)==>[          ]<==(wlan0)==>[____________]
             192.168.2.253|  Server  |192.168.2.254
                          [__________]
If I connect to the router/access point via wireless or directly to the Server via a crossover cable I can obtain an ip address from dhcpd, so that works. As far as I can see I just need to how to route between eth0 and wlan0 then I can provide internet access to those devices!

ifconfig:
Code:
eth0      Link encap:Ethernet  HWaddr 00:01:2e:27:ae:a3  
          inet addr:192.168.2.253  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::201:2eff:fe27:aea3/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:130 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:8422 (8.2 KiB)  TX bytes:1184 (1.1 KiB)
          Interrupt:21 Base address:0x4000 
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:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1516 (1.4 KiB)  TX bytes:1516 (1.4 KiB)
wlan0     Link encap:Ethernet  HWaddr 00:24:23:09:14:58  
          inet addr:192.168.2.254  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::224:23ff:fe09:1458/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:825 errors:0 dropped:0 overruns:0 frame:0
          TX packets:675 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:70391 (68.7 KiB)  TX bytes:64295 (62.7 KiB)
route:
Code:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     *               255.255.255.0   U     0      0        0 wlan0
192.168.2.0     *               255.255.255.0   U     0      0        0 eth0
loopback        *               255.0.0.0       U     0      0        0 lo
default         192.168.2.1     0.0.0.0         UG    1      0        0 wlan0
dhcpd.conf:
Code:
# dhcpd.conf
#
# Configuration file for ISC dhcpd (see 'man dhcpd.conf')
#
# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
authoritative;
ddns-update-style none;
# Allow bootp requests
allow bootp;
# Point to the TFTP server:
next-server 192.168.2.253;
# Default lease is 1 week (604800 sec.)
default-lease-time 604800;
# Max lease is 4 weeks (2419200 sec.)
max-lease-time 2419200;
subnet 192.168.2.0 netmask 255.255.255.0 {
#    option domain-name "my.lan";
    option broadcast-address 192.168.2.255;
    option subnet-mask 255.255.255.0;
    option domain-name-servers 192.168.2.1;
    option routers 192.168.2.1;
    range 192.168.2.2 192.168.2.99;
    range dynamic-bootp 192.168.2.100 192.168.2.150;
#    use-host-decl-names on;
#    if substring (option vendor-class-identifier, 0, 9) = "PXEClient" {
#      filename "/slackware-12.2/pxelinux.0";
#    }
}