USG20w bridge with Linksys Extender?? (Pls HELP!)

Hi, I just swapped my parents NBG5715 with a brand new USG20w, after configuring It exactly like the NBG I'm able to have the Linksys WES-610n bridge connect to the wireless but I get a DNS error while using it.. I can ping the Linksys from the USG20w but not the other way around, as if something's blocking the traffic from the Linksys to the USG..Please help as my father is getting on my nerves and ZyXel is closed for holidays