Question  Hi I am using gns3 and Cisco IOS 3600 Software (C3640-IK9O3S-M), Version 12.4(13).   I want to create ab ACL to permit or deny IPv6 Extension Headers like Hop-by-Hop option. enable conf t ipv6 access-list ACL-Test permit hbh any any % Invalid input detected at '^' marker. where the mark is under "hbh"   Any idea how to fix the issue?!   Thanks       ... View more