make the VPN feature work more reliable and secure#54

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asfgit merged 6 commits intoapache:masterfrom

remibergsma:master

Dec 9, 2014

Commits on Dec 8, 2014

remove biglock usage from ipsectunnel.sh
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renamed $leftgw to $leftnexthop to make clear what it does
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starting the tunnel will make it keep trying until it connects
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add a flag -c whether or not to check the VPN on create
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prevent CloudStack from removing the VPN connection
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made iptables for the VPN connection more secure
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