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The system must not have 6to4 enabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22545 GEN007780 SV-45982r1_rule ECSC-1 Medium
Description
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.
STIG Date
SUSE Linux Enterprise Server v11 for System z 2012-12-13

Details

Check Text ( C-43264r1_chk )
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.
Fix Text (F-39347r2_fix)
Disable the active 6to4 tunnel.
# ip link set down
Add this command to a startup script, or remove the configuration creating the tunnel.