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Special Forums IP Networking How to route packets back to incoming interface? Post 302993422 by MadeInGermany on Thursday 9th of March 2017 01:28:20 PM
Old 03-09-2017
I would not add a default route for the tun0.
Once it is present, I would try to delete it, with
Code:
route delete default 10.200.195.1

or similar.
AFAIK in a standard IP stack there is no way to return packets to the incoming interface - it always follows the routing table.
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Route classifier in tc(8)					       Linux						 Route classifier in tc(8)

NAME
route - route traffic control filter SYNOPSIS
tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ] DESCRIPTION
Match packets based on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For any packet to be classified by this filter, a routing table lookup is performed and the returned realm is used to decide on whether the packet is a match or not. OPTIONS
action ACTION_SPEC Apply an action from the generic actions framework on matching packets. classid CLASSID Push matching packets into the class identified by CLASSID. from REALM fromif TAG Perform source route lookups. TAG is the name of an interface which must be present on the system at the time of tc invocation. to REALM Match if normal (i.e., destination) routing returns the given REALM. EXAMPLES
Consider the subnet 192.168.2.0/24 being attached to eth0: ip route add 192.168.2.0/24 dev eth0 realm 2 The following route filter will then match packets from that subnet: tc filter add ... route from 2 classid 1:2 and pass packets on to class 1:2. NOTES
Due to implementation details, realm values must be in a range from 0 to 255, inclusive. Alternatively, a verbose name defined in /etc/iproute2/rt_realms may be given instead. SEE ALSO
tc(8), ip-route(8) iproute2 21 Oct 2015 Route classifier in tc(8)
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