[Swan] What is the meaning of "leftprotoport=17/0" ?

[ChenHao]

Hi All:
Based on example of /etc/ipsec.d/v6neighbor-hole.conf , the traffic of "ICMPv6 Neighbor Solicitation" or "ICMPv6 Neighbor Solicitation" in encrypted.  Right ? 
So I think "leftprotoport=17/0" means all UDP traffic is NOT protected by IPSec. Right? 

Thanks and regards
Hao Chen
 
 		 	   		  
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