My laptop has Ubuntu 10.10 and is connected to my router with full internet access, yet I can't ping it from other computers on my LAN. I tried the following:
- I can successfully ping those other computers from my Ubuntu laptop, so I didn't accidentally connect to someone else's network.
- I can successfully ping my Ubuntu laptop from itself, though I don't know if that means anything.
- I haven't messed with iptables at all, so it currently doesn't have any rules set that would cause it to reject anything.
- I made a DHCP reservation for my laptop's MAC address in my router to make sure I was always using the correct IP address.
Please note that I am using a "command line only" install of Ubuntu, so I can't use any GUI network config tools. The reason I want to ping it is because I am trying to run an NFS server on the laptop, yet despite correctly setting it up I cannot access the NFS volume on another computer because it isn't even visible on the network right now.