Thanks to your help and my friend at work
Problem solved finally get to boot with ipxe to my server ‘fog’ between different Vlans.
after following the suggested roles of george1421:
"source net 172.16.16. 0/24 to destination host 172.16.17.250 protocol allow any state
And Then flip the rule to allow the FOG server to talk to the clients
source to destination host 172.16.17.250 net 172.16.16. 0/24 protocol allow any state "
and the tone of suggestion
“the get the associated next-server / filename and Option 66 / Option 67”
It was enough to put in pfsense side vlan 172.16.16. *
Additional BOOTP / DHCP Options
Number type Value
66 IPAdresse or host 172.16.17.250
67 Text undionly.kpxe
Thank works in perfection all
They can close the topic as resolved to help more people