actually I think that reliance on mangle can be avoided since routing table 
selection can be done by source address rather than firewall marks. marks are 
good to differentiate different types of traffic but in our case all traffic 
should be trated the same.
there is difference in how traffic from the vpn vm is routed. this leads to two 
different attack vectors by a potentially compromised server. for the official 
solution routing tables can be manipulated, for Rudd-O's tool problems may 
arise from martian packets. some thought need to be given to proper firewalling.

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