On Fri, 07 Dec 2012 13:02:12 +0530 Sudaraka Wijesinghe <sudaraka.wijesinghe@xxxxxxxxx> wrote: > 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? I think it is normal. If you suspect DNS is the problem, just use a static resolv.conf with google/comodo dns nameservers (add "nohook resolv.conf" to /etc/dhcpcd.conf to forbid dhcpcd to touch the file). > > 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. > > So, you become root everytime you change network? If you need this kind of dynamic connectivity, you'll be much better off using networkmanager... -- Leonid Isaev GnuPG key: 0x164B5A6D Fingerprint: C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
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