I'm using Debian 9 Stretch Live from a USB Stick for testing hardware compatibility.
The firmeware for the Intel Wireless 2230 was not included in the Live image. Therefore I installed it offline from Binary firmware for Intel Wireless cards with
sudo dpkg -i firmware-iwlwifi_20161130-3_all.deb
After that I reinsert the Wifi module with
sudo modprobe -r iwlwifi ; sudo modprobe iwlwifi
The wifi adapter showed up in gnomes network manager and I could access my wlan. IP and subnet was correct via DHCP.
But I cannot ping hostnames like
I get 'hostname not found'. Ping via IP works fine and I receive packages
I changed '/etc/resolve.conf' to use 22.214.171.124 and 126.96.36.199 as nameservers and restarted networking with
I also tried
sudo resolvconf -u
At normal conditions a restart solved my issue. But with a Live Image a restart is a bit... repeating ; -)
Has someone an idea where I get wrong?