Edge-Core ECS4660-28F Management Manual page 1702

| IP Interface Commands
C 49
HAPTER
IPv6 to IPv4 Tunnels
tunnel ttl
show ipv6 tunnel
This command configures the TTL (Time to Live) value stored in the IPv4
header of a packet used for tunneling IPv6 traffic. Use the no form to
restore the default value.
S
YNTAX
tunnel ttl ttl-value
no tunnel ttl
ttl-value - The TTL value of the IPv4 encapsulating packet.
(Range: 0-255, where zero means that the TTL value is taken from
the Hop Limit set in the IP header of the encapsulated IPv6 packet)
D S
EFAULT ETTING
0
C M
OMMAND ODE
Interface Configuration (IPv6/v4 Tunnel)
C U
OMMAND SAGE
The command sets the hop limit for the IPv4 encapsulating packet.
However, note that IPv6 over IPv4 tunnels are modeled as a "single-hop."
That is, the IPv6 hop limit is decremented by only one when an IPv6 packet
traverses the tunnel. The single-hop model serves to hide the existence of
a tunnel. The tunnel is opaque to users of the network, and is not
detectable by network diagnostic tools such as traceroute.
E
XAMPLE
Console(config)#interface tunnel 2
Console(config-if)#tunnel ttl 5
Console(config-if)#
This command displays the status and configuration settings for all IPv6
over IPv4 tunnels.
C M
OMMAND ODE
Privileged Exec
E
XAMPLE
Console#show ipv6 tunnel
Tunnel:1
Tunnel Current State
Tunnel Source Address
Tunnel Destination Address
Time to Live
Tunnel Mode (Configured / 6-to-4 / ISATAP) : Configured
Console#
– 1702 –
: Up
: [VLAN1]192.168.0.3
: 192.168.0.2
: 255