An administrator is configuring inter-VLAN routing using router-on-a-stick and creates the following subinterfaces on a router: 'g0/0.10' with 'encapsulation dot1q 10' and 'g0/0.20' with 'encapsulation dot1q 20'. However, hosts in VLAN 10 cannot ping hosts in VLAN 20, even though both subinterfaces show as "up/up." What is the most likely missing configuration?
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