Hello,
First of all i'm really glad to see that Arch is available for Raspberry Pi.
I tried to change DNS like the usual way. https://wiki.archlinux.org/index.php/resolv.conf
I reboot the Raspberry but the "ping" command (google) always listen my local ISP.
It seems like arch ignore the resolv.conf.
Maybe its important to know i didn't use dhcp . I use static ip addresses.
On a Desktop PC i'm getting the IP directly from google.com. ( 80.228.65.183 )
The Raspberry resolve domain with pieces of my ISP. ( **ISP**.cache.google.com )