Re: [gentoo-user] Need networking help. Can't ping google.

[Dale]

Mick wrote:
> On 10 December 2010 09:40, Keith Dart<keith@×××××××××.biz>  wrote:
>
>> === On Fri, 12/10, Dale wrote: ===
>>
>>> I did this.  From smoker, I pinged google.  I got the IP address from
>>> that.  I then tried to ping google BY IP address on lightening.  It
>>> gives me the error "ping: unknown host 72.14.299.99".
>>>
>> ===
>>
>> That's a different error. That is not a valid address.
>>
>> So then, smoker is your router. But is your DSL modem also a router? Or
>> do you have PPPoE terminating in your smoker?
>>
>> Your DSL modem is probably a router with NAT. It will need a static IP
>> address back to your other network, next hop being smoker.
>>
>> Better would be to get a hub and connect all hosts (including modem, to
>> it.
>>
> As Keith says the easiest thing would be to go buy yourself a better
> ADSL router (because I suspect that you are running some cheap
> half-bridged ISP router) which will act as your ADSL modem, NAT
> router, DNS repeater, and LAN firewall, all-in-one.  You should be
> able to pick up a cheap cisco or netvanta from ebay.
>
> However, you ain't going to learn much network-wise if you do that.
> So, instead you may want to run something like this on smoker (check
> man iptables for details):
>
> iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
>
> Using the man pages you can add --match<parameters>  to only allow
> your lightning box to be processed and anything else dropped.
>
> You will also need to set an additional subnet for your LAN (between
> your smoker and lightning boxen).
>
> So all together it could look like this:
>
> Smoker:
>
> NIC eth2
>
> ip: 192.168.1.X
> Netmask : 255.255.255.0
> Broadcast: 192.168.1.255
> gateway: 192.168.1.254 (that's your ADSL router's IP address)
>
> for DNS use your ADSL router's IP address (if it acts as a local
> resolver) or your ISP's DNS server address, or OpenDNS ip addresses
> (google for it).
>
> Then you need to set up your second smoker NIC like this:
>
> NIC eth0
>
> ip: 192.168.2.X  (different subnet than your DSL network)
> Netmask : 255.255.255.0
> Broadcast: 192.168.2.255
> gateway: 192.168.1.254 (also your ADSL router's IP address)
>
> Finally, on your lightning box you need this:
>
> NIC ethX
>
> ip: 192.168.2.XX (same subnet as your eth0 NIC on smoker, but
> different IP of course)
> Netmask : 255.255.255.0
> Broadcast: 192.168.2.255
> gateway: 192.168.2.X  (same as the IP of your eth0 NIC on smoker)
>
> for DNS set up /etc/resolv.conf on lightning the same as for smoker above.
>
> The above should hopefully work.
>
>

OK.  I had a LONG day yesterday.  I took a nap.  I was getting a little 
goofy here.  Before I try all this, what is the best way to "undo" 
everything I have done with this so far?  I ask because I have tried two 
scripts and I don't know what all has been changed and what state things 
are in.

I also noticed this.  When I have lightening hooked to smoker and smoker 
hooked to the modem, I can't get to the internet until I restart eth2 
which is what connects smoker to the modem.  It acts like it is trying 
to use eth0 instead of eth2.

The modem I have is a Motorola Netopia 2210-02.  I took that info from 
the home page of the modem.  Just looking at it, it's the little silver 
colored thing and I did pay almost $80.00 for that thing.  It also says 
it has a DNS server and it is on.

Thanks

Dale

:-)  :-)