pfSense/pfsense 4ec6eeesrc/usr/local/www system_advanced_network.php

Fix saving IPv6 over IPv4 tunneling NAT setting. Fixes #9264

(cherry picked from commit 3fcf5ad71216922921801d85d063d360fde5566f)
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+4-5src/usr/local/www/system_advanced_network.php
+4-51 files

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