Hello, My laptop is connected to a LAN with Internet connection and it gets the IP stuff (address, routing, dns) via dhcp using the default systemd scripts on boot. I also have a 3G modem (USB) which I have created the ppp scripts to connect based on the Wiki article https://wiki.archlinux.org/index.php/3G_and_GPRS_modems_with_pppd Both connections work fine, except after switching to modem from LAN some applications (pidgin, xchat, ect. which were running) still uses the DNS nameserver from previous connection (LAN) meaning they still trying to send DNS queries to LAN router (which is not reachable at that time). This gets fixed after that application is closed and reopened. Is this behavior normal or a bug? Thanks. P.S. To disconnect/connect from LAN I either use:
# systemctl stop dhcpcd@wlan0 # systemctl start dhcpcd@wlan0 or # dhcpcd -k wlan0 # dhcpcd wlan0
To disconnect/connect I use poff/pon commands and the scripts are setup exactly as described on the Wiki. -- Sudaraka Wijesinghe.