[Firehol-support] Unable to let internal network access the internet via cable modem

Costa Tsaousis costa at tsaousis.gr
Mon Feb 10 20:03:31 GMT 2003

Hi John,

If your cable connection uses PPPoE (like ADSL) use this:

-- snip --

interface eth0 dsl
    client dhcp accept

interface ppp+ internet
    client all accept

internet eth1 lan
    policy accept

router lan2internet inface eth1 outface ppp+
    route all accept

--- snip ---

If your cable modem routes traffic directly to your eth0, use this:

-- snip --

interface eth0 internet
    client all accept

internet eth1 lan
    policy accept

router lan2internet inface eth1 outface eth0
    route all accept

--- snip ---

The difference of the two, is that DSL has a PPP device, while cable
normally does not have any PPP.

Read the docs to further restrict your firewall.

I don't however get where the sysctl error is. Can you help me?


John Zastrow said:
> Howdy,
> I've got the classic situation: eth0 on the linux box
> connected to a cable modem with dynamic IPs. eth1
> points to the internal network, which is currently one
> machine. That machine gets its IP from dhcpd and sees
> eth1 ( as its gateway. Linux box is
> running Redhat8.
> I would like to route to the internal machine full
> access to the linux box and internet, so I tried the
> firehol stock home_adsl config as a start (though I
> had to change the path for sysctl to /sbin/sysctl to
> stop firehol from complaining).
> Now the linux box sees the internet just fine through
> eth0. The internal box is getting its IP and I can ssh
> into the linux through eth1 just fine. But, the
> internal machine cannot see the internet. I also tried
> working through the tutorial config, but that didn't
> either.
> Nothing seems to be complaining, so it's obviously a
> config problem. Where do I start troubleshooting this?
>  The troubleshooting section is a little lite in this
> regard.
> TIA,
> -John
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