The following list shows the mapping of VyOS tunnel encapsulation modes to the corresponding Linux mode.
```
VyOS Linux
gre gre
gre-bridge gretap
ipip ipip
ipip6 ipip6
ip6ip6 ip6ip6
ip6gre ip6gre
sit sit
```
Besides `gre-bridge` this is pretty consistent. As bridge interfaces are also called tap interfaces `gre-bridge` will be renamed to `gretap` to make the post-processing much easier.