@lousylucky
The ICMP replies you can see in the WAN capture might be the gateway monitoring from pfSense. There is nothing redirected to the Proxmox IP without any DNAT rule.
The second line in the capture screenshot shows that the packets go out with the LAN address and the Outbound NAT screen shows no rule.
So for sure, there is nothing translated when packets go out on WAN and therefor if you set the rule on Proxmox for the LAN subnet, ping to public IPs will work.
@lousylucky said in Can ping Internet from Pfsense but cannot from LAN:
I can't get access to the internet (but as we can see data are going to the internet and stopped on pfsense)
Where do you think to see that?
pfSense should add outbound NAT rules automatically for internal networks to interfaces which have a gateway defined. A assume the Proxmox IP is set as gateway in the WAN interface settings, cause of the gateway monitoring, but check it again, please. Then go to the outbound NAT, select "automatic rule generation" and hit save and check if an auto-rule is generated.
If not switch to the hybrid mode and re-enable the manual rule.