Encapsulation Rule Conditions
Encapsulation conditions are specific to tunnel rules.
These conditions control certain types of plaintext, passthrough tunnels by their encapsulation protocol. You must choose at least one protocol to match before you can save the rule. You can choose:
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GRE (47)
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IP-in-IP (4)
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IPv6-in-IP (41)
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Teredo (UDP (17)/3455)