Router problems on Redhat 9.0 Linux 2.4.20-13.9.HOSTAP

[Yann Garcia]

-----Message d'origine-----
De : redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] De la part de Pete Nesbitt
Envoyé : vendredi 16 avril 2004 03:33
À : yann.garcia at smartcom.com; General Red Hat Linux discussion list
Objet : Re: Router problems on Redhat 9.0 Linux 2.4.20-13.9.HOSTAP

On April 15, 2004 12:21 am, Yann Garcia wrote:
> Hi,
>
> On my Linux box, I have two network interfaces: a LAN interface (eth0)
and
> a WLAN (wlan0). I set ip forwarding in /etc/sysctl.conf. I start a
sniffer
> (tethereal) on both interfaces. When I make a ping from WLAN network
to LAN
> network, ping don’ cross my gateway. The networks infos are:
> eth0: 10.0.1.37/16
> wlan0: 10.0.10.1/24
> The route tables are (netstat –rn):
>          Destination     Passerelle      Genmask         Indic   MSS
> Fenetre irtt Iface 10.0.10.0       0.0.0.0         255.255.255.0   U

>  0 0          0 wlan0 10.0.0.0        0.0.0.0         255.255.0.0
U   
>     0 0          0 eth0 169.254.0.0     0.0.0.0         255.255.0.0
U 
>       0 0          0 wlan0 127.0.0.0       0.0.0.0         255.0.0.0

> U         0 0          0 lo 0.0.0.0         10.0.0.1        0.0.0.0

> UG        0 0          0 eth0
>
> The iptables rules are (iptables –L –n –v):
>          Chain INPUT (policy ACCEPT 17346 packets, 1205K bytes)
>           pkts bytes target     prot opt in     out     source

>  destination
>
>          Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
>           pkts bytes target     prot opt in     out     source

>  destination
>
>          Chain OUTPUT (policy ACCEPT 17144 packets, 1306K bytes)
>           pkts bytes target     prot opt in     out     source

>  destination
>
> I’m sorry but I don’t understand why my gateway doesn’t work!
>
> Thank you very much for your assistance,
>
> Best regards,
>
> Yann Garcia
> Software Engineer
>
> SmartCom
> 400, Av Roumanille - BP 309
> 06906 Sophia Antipolis Cedex
> France
>
> Tel: +33 493 008 746
> Fax: +33 493 001 101
> Mail: yann.garcia at smartcom.com
> Site: www.smartcom.com


Hi,
Your eth0's network contains of the wlan IP range.
10.0.1.37/16 is part of a network ip range of 10.0.0.1 to 10.0.255.254
Your wlan range is inside that so no routing is performed.

You want to use a class C range for the wlan, so instead of 10.0.10.0
network,
try using one of the 192.168. class C networks. It may make be best to
use 2
different 192.168 networks (say 192.168.0.0/24 for LAN and
192.168.1.0/24 for
the WLAN).

Class A 1.0.0.0 - 127.255.255.255
Class B 128.0.0.0 - 191.255.255.255
Class C  192.0.0.0 - 223.255.255.255

Hope that helps.
--
Pete Nesbitt, rhce


Hi Pete


I use 10.1.10.0 as network for my wlan0 interface. The both interfaces
seam to be ok: I can run telnet on each network (LAN on eth0 and WLAN on
wlan0). But the problem persists: it's impossible to ping a machine on
LAN area (10.0.2.201) from a machine in WLAN area (10.1.10.2).
The interfaces configurations are:
Eth0:
        InetAddr: 10.0.1.37/16
        Network: 10.0.1.0
        Broadcast: 10.0.1.255
Wlan0:
        InetAddr: 10.1.10.1/24
        Network: 10.1.10.0
        Broadcast: 10.1.10.255 

L'IP forwarding is active (echo 1 > /proc/sys/net/ipv4/ip_forward).

The netstat -rn output is:
Table de routage IP du noyau
Destination   Passerelle    Genmask       Indic   MSS Fenêtre irtt
Iface
10.1.10.0     0.0.0.0       255.255.255.0   U         0 0          0
wlan0
10.0.0.0      0.0.0.0       255.255.0.0     U         0 0          0
eth0
169.254.0.0   0.0.0.0       255.255.0.0     U         0 0          0
wlan0
127.0.0.0     0.0.0.0       255.0.0.0       U         0 0          0 lo
0.0.0.0       10.0.0.1      0.0.0.0         UG        0 0          0
eth0

The iptables --numeric --verbose --List output is:
Chain INPUT (policy ACCEPT 76 packets, 5196 bytes)
 pkts bytes target   prot opt in   out     source
destination        

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target   prot opt in   out     source
destination        
    0     0 ACCEPT     all  --  *      *       0.0.0.0/0
0.0.0.0/0         

Chain OUTPUT (policy ACCEPT 76 packets, 5196 bytes)
 pkts bytes target   prot opt in     out     source
destination        


I don't understand what happen!!???
Please, can you help me?

Thank you very much,

Cheers,

Yann Garcia