Re: [gentoo-user] {OT} A simple routing problem

[Nilesh Govindrajan <me@nileshgr.com>]

On Tuesday 18 December 2012 09:40:44 AM IST, Kevin Brandstatter wrote:
> On 12/17/2012 08:00 PM, Nilesh Govindrajan wrote:
>> On Tuesday 18 December 2012 09:24:41 AM IST, Kevin Brandstatter
>> wrote:
>>> On 12/17/2012 07:44 PM, Nilesh Govindrajan wrote:
>>>> On Tuesday 18 December 2012 09:09:16 AM IST, Kevin
>>>> Brandstatter wrote:
>>>>> On 12/17/2012 07:26 PM, Nilesh Govindrajan wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I'm stuck with a routing issue:
>>>>>>
>>>>>> I have a DD-WRT router, which has one WAN port and four
>>>>>> LAN ports with WiFi.
>>>>>>
>>>>>> I have a fiber connection which is connected by dialing
>>>>>> PPPoE using pppd on the router, so I have no choice but to
>>>>>> connect the fiber connection on WAN port.
>>>>>>
>>>>>> I have yet another (much slower) ADSL link, with it's own
>>>>>> router (LAN-only). I'm trying to connect the router to the
>>>>>> DD-WRT router's LAN port. I'm able to access the router,
>>>>>> but routing through the gateway (the ADSL router) fails.
>>>>>>
>>>>>> Here's a simple diagram:
>>>>>>
>>>>>> The LAN network I'm using on DDWRT is 192.168.0.0, which
>>>>>> is the LAN network for the internal side and WiFi.
>>>>>>
>>>>>> The fiber connection is obviously public network.
>>>>>>
>>>>>> The other ADSL connection can be configured to change
>>>>>> subnet, it has a LAN side and WAN side.
>>>>>>
>>>>>> How I can I route through the ADSL router without requiring
>>>>>> a separate NIC/network for it?
>>>>>>
>>>>> what exactly are you trying to route? traffic out to the
>>>>> internet over the ADSL? or just trying to connect the
>>>>> machines on that router to the fiber line and route all
>>>>> traffic from both out on the fiber?
>>>>>
>>>>> -Kevin
>>>>
>>>>
>>>> Actually my fiber connection has a smaller limit than the ADSL
>>>> connection. I am trying to use the fiber connection for all
>>>> activities except some torrent downloading for which I want to
>>>> use my ADSL connection. Once I'm able to route through the
>>>> ADSL gateway, it would be easy for me to setup another ip on
>>>> eth0 on my machine on which transmission could listen. All
>>>> traffic on that ip would be routed through ADSL and otherwise
>>>> the fiber.
>>>>
>>>> -- Nilesh Govindarajan http://nileshgr.com
>>>>
>>> well in that case if you know how to set it up so that the
>>> dd-wrt router can see the ADSL gateway you can set a route on
>>> your box to route traffic on a specific device to that gateway.
>>> In fact, you might even be able to static route the torrent ports
>>> to that gateway from dd-wrt
>>>
>>> -Kevin
>>
>>
>> I tried that. As the simplest test, I added this on ddwrt:
>>
>> route add -host 8.8.8.8 gw 192.168.0.32
>>
>> Where 192.168.0.32 is the private IP of my ADSL router. But when I
>> say ping 8.8.8.8 from ddwrt, I don't get any response. Any idea why
>> this happens?
>>
>> -- Nilesh Govindarajan http://nileshgr.com
>>
> is the ADSL configured to forward to the internet? how is the gateway
> set up? it needs to be configured to route the outbound traffic to the
> internet
>
> -Kevin

Yes, I have a static IP on the ADSL connection and it is setup for the 
same. Connects using MER and NAT is enabled.
If I connect the router to DD-WRT's WAN port and change subnet of the 
ADSL private network (matching the same on WAN interface), then it 
works properly.

--
Nilesh Govindarajan
http://nileshgr.com