MacOS – OS X 10.10.3 connects to wireless router but unable to resolve domain names

dnsmacmacosNetwork

I can connect my daughter's MacBook to the wireless router but not browse the internet with two different browsers (Firefox and Safari). This is a recent development as she has successfully browsed the net with this MacBook earlier. She says that she didn't change any settings.

Her MacBook is given an IP address by the wireless router's DHCP server. I can ping other computers on the LAN as well as on the WAN (but only using an IP address with the ping command). In other words, I can ping 8.8.8.8 but not google.com. My router's log does not log any requests from her macbook.
Other computers on this LAN have unrestricted access to internet browsing.

ifconfig en1 returns… 

en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
     ether 00:23:12:55:3b:a0
     inet6 fe80::223:12ff:fe55:3ba0%en1 prefixlen 64 scopid 0x5
     inet 192.168.1.9 netmask 0xffffff00 broadcast 192.168.1.255
     nd6 options=1<PERFORMNUD>
     media: autoselect
     status: active

I've tried rebooting the computer and the router.
Any help trouble shooting this would be greatly appreciated.
to clarify my original question based on comments that I've gotten…

@Buscar I was only connected via wifi when I ran the ifconfig so the en1 must be wifi.

@Jamie I checked the DNS servers listed in the router status and got 208.180.42.68 208.180.42.100 and I can ping these from my daughter's macbook. It is curious that my Netgear router doesn't log any requests from the macbook. Also, the App Store on the macbook indicates that there are 2 items in the queue (icon in the dock) but when I click on that icon the App store doesn't finish loading (probably because it cannot connect [on a different port than 80???]).

I also tried dig and nslookup. These both had connection time outs.
Thanks again for your help

Best Answer

Ok, I've figured the problem out in my daughter's macbook. System>Network>Wi-Fi>Advanced DNS tab. I removed the existing DNS servers and used Google's 8.8.8.8, 8.8.4.4. Reopened the browser and it is working now. nslookup and dig also work. Not sure where the DNS servers that I replaced were from or how they got there. I also noticed that in my macbook (one of the ones that were working fine), the DNS server is the wifi router ipaddress. I'm not sure if I should use that or just stick with Googles. Hope this helps someone.

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