network: fix ipv6 tunnel encapsulation limit (#19087)
The encapsulation limit of IPv6 tunnel can not be set to 4, which is the default value of the encapsulation limit. (cherry picked from commit 6b1ed5e7)
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The encapsulation limit of IPv6 tunnel can not be set to 4, which is the default value of the encapsulation limit. (cherry picked from commit 6b1ed5e7)