Solved My ISP giving a MTU of 576

Hello all,
I have a little server with one nic on WAN and the other LAN, my WAN is set on DHCP cause i dont have a static IP.
Now my ISP (cable) is passing the info but it set the MTU to 576 which give me all sort of problem so i try to force it to 1500 using ifconfig re1 mtu 1500.
which work for 2 sec before being rewrite by the DHCP is there a way to set just the MTU to static?

Thanks
 
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