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This tests the RFC3706 DPD implementation, with dpdaction=restart on east,
and dpdaction=hold on west.
West will trap, while east will attempt to restart the connection when
DPD times out.
Order of Operations:
1) East sets up for tunnel
2) West initiates tunnel to east
3) We idle for 20 seconds, to prove that DPD R_U_THERE/R_U_THERE_ACKs work.
4) West blocks traffic on eth0
5) Both sides trigger a DPD Timeout:
East attempts to restart/reinitiate
West puts the eroute into %trap
6) West removes the traffic block
7) West will receive the packets from east, and should renegotiate the tunnel
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