Quick Routing Question

[Jason Morgan]

On Tue, Nov 01, 2005 at 12:42:27PM -0500, Steve Bertrand wrote:
> 
> > Ok, it looks like it was an issue with the default settings 
> > on the Linksys (and is still somewhat of an issue). I can now 
> > connect to systems in each of the two subnets and I also have 
> > routing to the outside world from both subnets. My only 
> > remaining issue is getting to the web app setup for the 
> > Linksys - I can only do it from a local address (meaning a 
> > 192.168.1.x address).  The Linksys refuses connections from 
> > my 10.0.0.x subnet. Is this a NAT issue?
> 
> No, this is not a NAT issue.
> 
> You are not doing NAT in this situation (on exception through to the
> Internet)...the 10/24 and 192.168.1/24 subnets are routed (not NAT'd)
> through the FBSD box. They are communicating directly to one another,
> with no translation at all.
> 
> The problem here (my opinion only), is that the Linksys sees the 10.x
> address and is not familiar with it (unless explicitly told to do so).
> 
> What you need to do, is set a static route inside the Linksys that
> states that 10.0.0.x/24 should be routed to 192.168.1.2 (aka FBSD fw),
> out the LAN side of the device. Otherwise, what will happen is that the
> Linksys sees 10/24 as an *outside* address range, and it will forever
> trying to send it out it's WAN side, to it's default GW, even if there
> is not one configured.
> 
> The Linksys may try to give up searching for the 10 network because the
> only addresses it knows how to route through the LAN side will be the
> 192 network.
> 
> I hope I haven't confused you here. I've gotten quite busy so I'm typing
> faster tham I'm able to think :)
> 
> Anyway, it's been a while since I've played with a Linksys, but I am
> certain you can add static routes.
> 
> Again, what you want is a route that states:
> 
> - if it needs to go to 10.0.0.0, 255.255.255.0, send it to 192.168.1.2.

Got it. I'll try that. The Linksys does allow you to specify static 
routes.

-Jason

> 
> Now, one more thing...it may be possible that the Linksys interface may
> ONLY allow connection from it's own subnet, but you'll be able to
> enlighten me here :)
> 
> > Thanks again for all the help. tcpdump helped a lot.
> 
> No problem. I'm glad I could be of help.
> 
> Truly, what you are learning here is how the Internet as a whole works
> (as far as routing is concerned). The only difference is that you are
> playing with private IP address allocations, as opposed to public
> addresses.
> 
> Steve
> 
> > 
> > Jason
> > 
> > > 
> > > Cheers, and good luck!
> > > 
> > > Steve
> > > 
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>