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New feature: Replace original IPv4 default route

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Adds "v4-defaultroute-replace" config/command-line setting (default disabled).
When enabled, it will unconditionally disable the pre-flight IPv4 connectivity
check, and ensure that any pre-existing IPv4 default routes are removed during
startup (and presumably replaced with the one pointing to the CLAT, unless
"v4-defaultroute-enable" has been disabled). Any IPv4 default routes that were
removed in this manner are restored when clatd is shutting down.
This commit is contained in:
Tore Anderson
2015-10-22 11:12:34 +02:00
parent 2f2a59ddf3
commit 9f1789f34d
2 changed files with 38 additions and 1 deletions
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README.pod
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@@ -266,6 +266,9 @@ system has IPv4 connectivity, disable this setting. You may instead use the
B<v4-defaultroute-enable> and B<v4-defaultroute-metric> settings to prevent
B<clatd> from interfering with native IPv4 connectivity.
Note that enabling B<v4-defaultroute-replace> will override
B<v4-conncheck-enable> and unconditionally disable IPv4 connectivity checking.
=item B<v4-conncheck-delay=seconds> (default: I<10>)
When performing an IPv4 connectivity check, wait this number of seconds
@@ -286,6 +289,23 @@ an environment where native IPv4 connectivity is also present, you might want
to disable this and instead control manually which IPv4 destinations is
reached through the CLAT and which are not.
=item B<v4-defaultroute-replace=bool> (default: I<no>)
Instructs B<clatd> to remove any pre-existing IPv4 default routes, replacing it
with one pointing to the CLAT (assuming B<v4-defaultroute-enable> is I<yes>).
The replacement is temporary, any pre-existing routes that were removed will be
restored when B<clatd> is shutting down.
Note that nothing prevents software like a connection manager or a DHCPv4
client daemon from re-adding any replaced routes while B<clatd> is running.
If you enable B<v4-defaultroute-replace> while at the same time disabling
B<v4-defaultroute-enable>, B<clatd> will remove any pre-existing IPv4 default
routes but not add any of its own.
Setting B<v4-defaultroute-replace> to I<yes>will disable the IPv4 connectivity
check.
=item B<v4-defaultroute-metric=integer> (default: I<2048>)
The metric of the IPv4 default route pointing to the CLAT. The default is