What kind of vpn are you using, is it openvpn? How did you establish it,
was it via the network-manager plugin? Or do you manually bring up an
openvpn client? If it's some other vpn, could you clarify how it is used
please?
Thanks
** Changed in: dnsmasq (Ubuntu)
Status: New => Incomplete
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Touch seeded packages, which is subscribed to dnsmasq in Ubuntu.
https://bugs.launchpad.net/bugs/1704288
Title:
Ubuntu 16.04 VPN : DNS information leaking through dnsmasq
Status in dnsmasq package in Ubuntu:
Incomplete
Bug description:
Hi,
After connecting the VPN
# killall -USR1 dnsmasq
# tail syslog.log
...
Jul 13 02:18:56 tp dnsmasq[1476]: time 1499905136
Jul 13 02:18:56 tp dnsmasq[1476]: cache size 0, 0/0 cache insertions re-used
unexpired cache entries.
Jul 13 02:18:56 tp dnsmasq[1476]: queries forwarded 154, queries answered
locally 1
Jul 13 02:18:56 tp dnsmasq[1476]: queries for authoritative zones 0
Jul 13 02:18:56 tp dnsmasq[1476]: server 198.18.0.1#53: queries sent 0,
retried or failed 0
Jul 13 02:18:56 tp dnsmasq[1476]: server 198.18.0.2#53: queries sent 0,
retried or failed 0
Jul 13 02:18:56 tp dnsmasq[1476]: server 192.168.0.254#53: queries sent 12,
retried or failed 0
The first two name server are provided by the vpn connection.
The last 192.168.0.254 name server is running on my local router and forward
request to my ISP (this is the default name server when VPN is not activated).
When I query the DNS, queries are sent to each name server which makes
a DNS information leaking to my ISP
I validated that by the mean of tcpdump on eth and tun interfaces and
also by using that site: https://www.dnsleaktest.com/
I tried to force the VPN DNS server IPs in the VPN configuration (edit Vpn
connection -> ipv4 - > Automatic Adresses only ..) but the result is the same.
dnsmasq must not have the local DNS present while VPN connection is
established.
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