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man: add a warning to NetworkManager.conf manual for rp_filter and connectivity checking

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Thomas Haller 2019-02-08 16:05:36 +01:00
parent bba33ba20c
commit 4023012cd1
1 changed files with 8 additions and 0 deletions
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8
man/NetworkManager.conf.xml
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@ -1056,10 +1056,12 @@ managed=1
<refsect1>
<title><literal>connectivity</literal> section</title>
<para>This section controls NetworkManager's optional connectivity
checking functionality. This allows NetworkManager to detect
whether or not the system can actually access the internet or
whether it is behind a captive portal.</para>
<para>Connectivity checking serves two purposes. For one, it exposes
a connectivity state on D-Bus, which other applications may use. For example,
Gnome's portal helper uses this as signal to show a captive portal login
@ -1070,6 +1072,12 @@ managed=1
when being connected to WWAN and to a Wi-Fi network which is behind a captive
portal, WWAN still gets preferred until login.</para>
<para>Note that your distribution might set <literal>/proc/sys/net/ipv4/conf/*/rp_filter</literal> to
strict filtering. That works badly with per-device connectivity checking,
which uses SO_BINDDEVICE to send requests on all devices. A strict rp_filter
setting will reject any response and the connectivity check on all but the
best route will fail.</para>
<para>
<variablelist>
<varlistentry>