Running Wireless and Wired eth connections at the same time

[John Summerfield]

sam wrote:
> Hi john, and all!!
> 
> Thanks for the replies to this....
> 
> What I really wound up doing to resolve this:
> 
> Setup:
>     Laptop
>       ath0 - 192.168.1.33 (sub1)
>       eth0 - 192.168.2.33 (sub2)
> 
>     Internal Box
>       eth0 - 192.168.2.99 (sub2)
> 
> This allows me to be able to have the laptop connect to both the wireless
> network, and the internal box at the same time.
> 
> I also needed to modify the laptop/internal box:
> 
>  Laptop:
>   -setup iptables for masquerade on ath0 port.

That's usually wrong

>    this basically takes traffic on eth0 and forwards it to ath0
>   -setup box for ip_forwarding (/etc/sysctl.conf)
> 
>  Internal Box
>   -setup "route" to use the laptop eth0 as the gateway (route
>    cmd)
> 
> To ensure traffic works, check the traffic on the laptop for both eth0/ath0
> using iptraf, to see what is coming from the Internal box, and to ensure
> that it gets to the wireless network...
> 
> It works as required....
> 
> Thanks!!
> 
> 
> -----Original Message-----
> From: fedora-list-bounces at redhat.com
> [mailto:fedora-list-bounces at redhat.com]On Behalf Of John Summerfield
> Sent: Tuesday, October 16, 2007 5:23 PM
> To: For users of Fedora
> Subject: Re: Running Wireless and Wired eth connections at the same time
> 
> 
> Marko Vojinovic wrote:
>> On Monday 15 October 2007 03:51, sam wrote:
>>> here's what i have so far.
>>>
>>>                                    >>>>  dns
>>>
>>> internal box   <<<<  >>>laptop >>>+>>>   internet
>>>   192.168.2.99   (eth0)     (ath0)
>>>                 192.168.2.33  192.168.1.33
>>>
>>> the laptop can access both the internal box, and the internet
>>> the internal box can only access the laptop...
>>>
>>> i'm trying to be able to allow the internal box to be able to access
>>> everything that the laptop can...
>> Maybe I am wrong, but I believe You need to setup eth0 as a bridged
> network
>> connection. There is a howto about it in www.tldp.org :-).
> 
> You are.
> 
> The laptop needs forwarding enabled:
> 10:13 [summer at numbat ~]$ grep ip_ /etc/sysctl.conf
> net.ipv4.ip_forward = 0
> 08:19 [summer at numbat ~]$
> Change that to 1. "man sysctl"
> 
> Hosts on each side need route set so the can find the other. "man route"
> 
> Use of tcpdump on the laptop can help sort out where packets are being
> lost. "man tcpdump"
> Something like this:
> tcpdump -i any host a and host b
> Hosts  a and be are on opposite sides of the laptop.
> 
> 
> 
> --
> 
> Cheers
> John
> 
> -- spambait
> 1aaaaaaa at coco.merseine.nu  Z1aaaaaaa at coco.merseine.nu
> 
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-- 

Cheers
John

-- spambait
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Please do not reply off-list