I have a self built XG at home and I'm using a RED Tunnel to a Sophos UTM (server) at another Site. The XG is "RED legacy client".
My XG has 2 internet connections: primary is a VDSL 100 (Germany), second is backup with LTE.
I've configured the LTE connection as backup only when all active WAN interfaces fail because I have limited data transfer volume on the LTE connection.
Sadly there is a short disconnection (about 10-60 seconds) on the main line after 24h hours (enforced by the provider, called "Zwangstrennung").
Recently I've noticed that my LTE data volume was exhausted although the main line has been available all the time.
After some research I've found out that the RED connection seems to switch to the LTE line when the main line has the "Zwangstrennung" and does not switch back when it is available again.
So how can I force the RED tunnel to the main line as long as it is available?
Otherwise my data volume is exhausted after about 10-15 days and the backup line is useless for the rest of the month.
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