I have an SG300-20 configured with 4 vlans, 1, 10, 20, 30. It is configured for L3. I use this for my home lab network. VLAN 1 is connected to my cable modem, and gets it's IP address and gateway via DHCP. I have a host on VLAN 10, and a host on VLAN 20. I can ping from one host to the other host just fine. I can ping from the switch to the hosts, and from the switch to the cable modem and internet. I cannot ping from either of the hosts to the cable modem or internet.
Yep you are absolutely right and now I feel like an idiot. The source IP never gets changed, and the gateway device has no route back. I knew it was going to be something simple I had overlooked. Time to go set up a VM to do the NAT.
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