Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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And the default gw of the linux box is the PC, right?
OK.... here's the deal:
When you ping something, say... your isp's ip address, packets will go to your gateway (cause it will be outside of your scope, right?). The server will take those packages through this chains:
If you had enabled forward (cat 1 > /proc/sys/net/ipv4/ip_forward), the packet will go on to the next chain.
FORWARD (they are ment to go to another host): ACCEPT.
and then the packet goes out to the lan..... BUT the packet didn't change it's source address. It should have been changed to the PC's so that the packet is handled the PC (remember your laptop is not reachable in the LAN). Why did this happen? There's no MASQUERADE rule in the POSTROUTING chain (according to what you wrote).