[Techtalk] routing question

[Sarah Newman]

I'm a routing luddite, but my guess would be that the routing table on 
either the laptop or the router is not complete.  Beyond that I'm just 
throwing out ideas.

Does the laptop's wired and wireless interfaces have to be on different 
class C networks, or is it OK to have both the interfaces be on the same 
class C?  I'm wondering that because I don't know if with wireless the 
router would decide to send packets with 192.168.2.x over the wireless 
indiscriminately, even if it didn't know of a computer with that 
address.  Probably not given it is a router and router's aren't supposed 
to do that.

I can enable logging for my router; maybe that could help you figure out 
who/why is dropping packets from the PC and/or unable to send out 
packets to the PC?  Is it possible to look at the routing table for the 
router and manually add new routes?

I don't know the tools for trying this on Linux off the top of my head, 
sadly.

Carla Schroder wrote:
> I want to use a wireless laptop as a temporary router for a wired PC. But my 
> poor old brain has forgotten how. Here is the setup:
> 
> Internet
> |
> local router/WAP: 192.168.1.10, 192.168.2.10, 12.34.56.78 (Internet)
> |
> |
> laptop 192.168.2.25 (wireless), 192.168.3.10 (wired)
> |
> wired PC 192.168.3.11
> 
> I have IP forwarding turned on in the laptop. The laptop and wired PC can ping 
> each other, and the PC can ping both laptop addresses. But I can't get past 
> that- can't ping the router or get Internet. The laptop has Internet and can 
> access the rest of the LAN. I have the default gateway on the wired PC set to 
> 192.168.3.10.
> 
> So what am I doing wrong? Or better, how do I do it right?
> 
> thanks!
> Carla