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

[Pandu Poluan]

On Dec 18, 2012 11:59 AM, "Nilesh Govindrajan" <me@××××××××.com> wrote:
>
> On Tuesday 18 December 2012 09:52:43 AM IST, Nilesh Govindrajan wrote:
> > 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
>
> Wait, it just worked. Looks like I missed out something yesterday.
> Thanks for your help.
>

Most likely, it's just route caching. I forgot the exact command, but it
goes like 'ip route cache flush'.

Rgds,
--