Howto Multi WAN on single WAN Interface

[maydo]

Hello,

i need to setup Multi WAN

• ISP1
  (Genexis FTTH Modem,
  PPPoE Vlan tagged)

• ISP2
  (Cisco VDSL Modem,
  Plain Ethernet)

• PfSense 2.3.2
  (Shuttle Barebone 1x LAN Interface, 1x WAN Interface)

• Netgear 8port managed Switch

So the Problem is there is just 1x single Wan Port on pfsense machine.

Can i handle this with the managed netgear switch ?
How can i setup for load balancing or failover ?

thx