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-rw-r--r--res/layout/faq.xml8
-rw-r--r--res/values/strings.xml2
2 files changed, 10 insertions, 0 deletions
diff --git a/res/layout/faq.xml b/res/layout/faq.xml
index dc591318..c4fd57f0 100644
--- a/res/layout/faq.xml
+++ b/res/layout/faq.xml
@@ -34,6 +34,14 @@
<TextView
style="@style/faqhead"
+ android:text="@string/battery_consumption_title" />
+
+ <TextView
+ android:id="@+id/faq_battery"
+ style="@style/faqitem" />
+
+ <TextView
+ style="@style/faqhead"
android:text="@string/tap_mode" />
<TextView
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 69fb9e35..a0d1a4f0 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -227,4 +227,6 @@
<string name="translation">Translation</string>
<string name="openvpn_log">OpenVPN Log</string>
<string name="import_config">Import OpenVPN configuration</string>
+ <string name="battery_consumption_title">Battery consumption</string>
+ <string name="baterry_consumption">In my personal tests the main reason for high battery consumption of OpenVPN are the keepalive packets. Most OpenVPN servers have a configuration directive like \'keepalive 10 60\' which translates to a keepalive packet from client to server and server to client every ten seconds. &lt;p> While these packets are small and do not use much traffic, they keep the mobile radio network busy and increase the energy consumption. &lt;p> This keepalive setting cannot be changed on the client. Only the system administrator of the OpenVPN can change the setting. &lt;p> Unfortunatly using a keepalive larger than 60 seconds with udp has problems with some NAT gateways which terminate the state for a connnection after a short timeout (60s in my tests). Using TCP with long keepalive timeout works but has the TCP over TCP problem. (See &lt;a href=\"http://sites.inka.de/bigred/devel/tcp-tcp.html\">Why TCP Over TCP Is A Bad Ide&lt;/a>)</string>
</resources>