Our UTM 9 has 6 configured DSL (PPPoE) connections and so we're using uplink balancing. We configured the reconnect in pairs (DSL 1 & 4 at 3:00, DSL 2 & 5 at 4:00, and DSL 3 & 6 at 5:00). The problem is that we have short connectivity issues at these times.
My assumption: The reconnect process doesn't clear the route cache (with some routes over the DSL connection in question) and so some destinations are only reachable again when the DSL connection is back up.
The configuration option "binding timeout" got me thinking in this direction (net.ipv4.route.gc_timeout, http://vincent.bernat.im/en/blog/2011-ipv4-route-cache-linux.html).
Any hints and opinions are very welcome!
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