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Old 1st February 2009
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,975
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Having experimented, I have determined it is possible to avoid RFC1918 collisions or interference with any other IPv4 address: Use IPv6 addressing on the tun device instead of IPv4. But unless you also set up a gif(4) tunnel for IPv4, NAT is the only way to ensure no routing problems.

Having played with tunneling ipv4 over ipv6 with gif; I find it easier to set up IPSec.
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