Thanks for both repsonse.
I didn’t change any off the default network config about offloading.
So i can take a look at that if something changes.
After that i change ix0 to LAN there is no problem with a constant ping.
So i guess it has to be something with offloading or that all 4 nic ports are on the same soc.
Last thing that i can check if something changes when i use ix2 or ix3 for WAN and ix0 or ix1 for LAN
But if you guys have another idea i will like to hear it.