• Able to ping the Cradlepoint LAN IP from a remote network
• Cannot ping client device(s) on the Cradlepoint LAN from a remote network

• Device(s) on the LAN have the wrong default gateway
  • When a device receives traffic from an IP that is not on the same network, it will forward traffic to its default gateway IP. 
  • Typically, the default gateway IP is the IP address of the upstream router

1. Verify the default gateway IP on the client device(s)
   1. Log in to the Cradlepoint UI
   2. Navigate to System > System Control > Device Options
   3. Click "Device Console" 
   4. Use tcpdump utility to identify the client device(s) default gateway:
      1. tcpdump -i <interface> host <client device IP> -nn
      2. E.g. tcpdump -i eth0.2 host 1.2.3.4 -nn
   5. Ping the client device from a device on a remote network
   6. Investigate tcpdump output:
      1. tcpdump should show traffic leaving the Cradlepoint and ARP requests from the client device for its default gateway IP. For example:
      • ​
2. Configure correct default gateway on client device(s)
   1. Log into client device(s) and set the default gateway to the Cradlepoint's LAN interface IP

• NCOS: CLI - Introduction to TCPdump provides more information about using tcpdump