Rule ID
SV-45982r1_rule
Version
V1R12
CCIs
6to4 is an IPv6 transition mechanism involving tunneling IPv6 packets encapsulated in IPv4 packets on an ad-hoc basis. This is not a preferred transition strategy and increases the attack surface of the system.
Check the system for any active 6to4 tunnels without specific remote addresses. # ip tun list | grep "remote any" | grep "ipv6/ip" If any results are returned the "tunnel" is the first field. If any results are returned, this is a finding.
Disable the active 6to4 tunnel. # ip link set <tunnel> down Add this command to a startup script, or remove the configuration creating the tunnel.