iptables masquerade with 2 internet nics (and ppp)

[Steven Alligood]

Chris Carey wrote:
> On Thu, Mar 20, 2008 at 1:49 PM, Dave Smith <dave at thesmithfam.org> wrote:
>
>   
>>  When I run this rule, all is well and wireless clients connected to eth1
>>  get internet access through eth0:
>>
>>  /sbin/iptables --table nat --append POSTROUTING --out-interface eth0 -j
>>  MASQUERADE
>>
>>  But when I use this rule, clients can't access the internet:
>>
>>  /sbin/iptables --table nat --append POSTROUTING --out-interface ppp0 -j
>>  MASQUERADE
>>     
>
> Do you have the FORWARD rule which allows eth1 to forward to ppp0?
>
>   
Also, don't forget the sysctl setting of

net.ipv4.ip_forward = 1

or the kernel will never send traffic from one interface to the other.
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