ping6, ping ipv6 return code

Table 42 ping Test Characters (IPv6)

 

!	Each exclamation point indicates receipt of a reply.
.	Each period indicates that the network server timed out while waiting for a reply.
?	Unknown error.
@	Unreachable for unknown reason.
A	Administratively unreachable. Usually, this output indicates that an access list is blocking traffic.
B	Packet too big.
H	Host unreachable.
N	Network unreachable (beyond scope).
P	Port unreachable.
R	Parameter problem.
S	Source address failed ingress/egress policy.
T	Time exceeded.
U	No route to host.
X	Reject route to destination.

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Note Not all protocols require hosts to support pings. For some protocols, the pings are Cisco-defined and are answered only by another Cisco router.

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When the ping ipv6 command is enabled, the router attempts to resolve hostnames into IPv6 addresses before trying to resolve them into IPv4 addresses, so if a hostname resolves to both an IPv6 and an IPv4 address and you specifically want to use the IPv4 address, use the ping (IPv4) command.