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Configuring Network
Configuring IPv6
Cisco CVR100W Wireless-N VPN Router Administration Guide
59
3
Configuring IPv6 Static Routing
You can configure static routes to direct packets to the destination network. A
static route is a predetermined pathway that a packet must travel to reach a
specific host or network.
Some ISPs require static routes to build your routing table instead of using
dynamic routing protocols. Static routes do not require CPU resources to
exchange routing information with a peer router.
You can also use static routes to reach peer routers that do not support dynamic
routing protocols. Static routes can be used together with dynamic routes. Be
careful not to introduce routing loops in your network.
To create an IPv6 static route:
STEP 1
Choose
Networking
>
IPv6 Configuration
>
IPv6
Static Routing
.
STEP
2
In the
IPv6 Static Routing
table, click
Add Row
.
STEP
3
Enter the following information:
Name
Enter the route’s name.
Destination
Enter the IPv6 address of the destination host or net-
work for this route.
Prefix Length
Enter the number of prefix bits in the IPv6 address that
define the destination subnet.
Gateway
Enter the IPv6 address of the gateway through which
the destination host or network can be reached.
Interface
Choose the interface for the route from the
drop-down menu:
LAN
,
WAN
, or
6to4
.
Metric
Enter the priority of the route by choosing a value
between 2 and 15. If multiple routes to the same desti-
nation exist, the route with the lowest metric is used.
Page 62 / 150
Configuring Network
Configuring IPv6
Cisco CVR100W Wireless-N VPN Router Administration Guide
60
3
STEP
4
Click
Save
.
STEP
5
To edit the settings of a route, select the route and click
Edit
. To delete a selected
route, click
Delete
. Click
Save
to apply your changes.
Configuring Routing (RIPng)
RIP Next Generation (RIPng) is a routing protocol based on the distance vector
(D-V) algorithm. RIPng uses UDP packets to exchange routing information through
port 521.
RIPng uses a hop count to measure the distance to a destination. The hop count is
referred to as metric, or cost. The hop count from a router to a directly-connected
network is 0. The hop count between two directly-connected routers is 1. When
the hop count is greater than or equal to 16, the destination network or host is
unreachable.
By default, the routing update is sent every 30 seconds. If the router receives no
routing updates from a neighbor after 180 seconds, the routes learned from the
neighbor are considered as unreachable. After another 240 seconds, if no routing
update is received, the router removes these routes from the routing table.
On the CVR100W, RIPng is disabled by default.
To configure RIPng:
STEP 1
Choose
Networking
>
IPv6 Configuration
>
Routing (RIPng)
.
STEP
2
Check
Enable
.
STEP
3
Click
Save
.
Active
Check to make the route active.
When you add a route in an inactive state, it gets listed
in the routing table, but is not used by the CVR100W.
You can always activate the route later.
This feature is useful if the network that the route con-
nects to is not available when you added the route.
When the network becomes available, you can enable
the route.
Page 63 / 150
Configuring Network
Configuring IPv6
Cisco CVR100W Wireless-N VPN Router Administration Guide
61
3
Configuring IPv6-to-IPv4 Tunneling
IPv6-to-IPv4 tunneling (6-to-4 tunneling) allows IPv6 packets to be transmitted
over an IPv4 network. 6to4 tunneling is typically used when a site or end user
wants to connect to the IPv6 Internet using the existing IPv4 network.
To configure IPv6-to-IPv4 tunneling:
STEP 1
Select
Networking
>
IPv6 Configuration
>
6 to 4 Tunneling
.
STEP
2
Check
Enable
.
STEP
3
Click
Save
.
Viewing IPv6 Tunnel Status
To view IPv6 tunnel status:
STEP 1
Choose
Networking
>
IPv6 Configuration
>
IPv6 Tunnels Status
.
This page displays information about the automatic tunnel set up through the
dedicated WAN interface. The table shows the name of tunnel and the IPv6
address that is created on the device.
STEP
2
Click
Refresh
to refresh the data on this page.
Configuring Router Advertisement
The Router Advertisement Daemon (RADVD) on the CVR100W listens for router
solicitations in the IPv6 LAN and responds with router advertisements as required.
This is stateless IPv6 auto configuration, and the CVR100W distributes IPv6
prefixes to all nodes on the network.
To configure the RADVD:
STEP 1
Choose
Networking
>
IPv6 Configuration
>
Router Advertisement
.
STEP
2
Enter the following information:
Page 64 / 150
Configuring Network
Configuring IPv6
Cisco CVR100W Wireless-N VPN Router Administration Guide
62
3
RADVD Status
Check
Enable
to enable RADVD, or check
Disable
to
disable RADVD.
Advertise Mode
Select one of the following modes:
•
Unsolicited Multicast:
Select this mode to
send Router Advertisements (RAs) to all
interfaces belonging to the multicast group.
•
Unicast Only:
Select this mode to restrict
advertisements to well-known IPv6 addresses
only (RAs are sent to the interface belonging to
the known address only).
Advertise Interval
If you choose
Unsolicited Multicast
as the advertise
mode, enter the advertise interval (4 to 1800). The
default is
30
. The advertise interval is a random value
between the Minimum Router Advertisement Interval
(MinRtrAdvInterval) and Maximum Router
Advertisement Interval (MaxRtrAdvInterval).
MinRtrAdvInterval = 0.33 * MaxRtrAdvInterval
RA Flags
Check
Managed
to use the administered/stateful
protocol for address auto configuration.
Check
Other
to use the administered/stateful protocol
of other, non-address information auto configuration.
Router Preference
Choose
low
,
medium
, or
high
from the drop-down
menu. The default is
medium
.
The router preference provides a preference metric for
default routers. The low, medium and high values are
signaled in unused bits in RA messages. This
extension is backward compatible, both for routers
(setting the router preference value) and hosts
(interpreting the router preference value). These values
are ignored by hosts that do not implement router
preference. This feature is useful if there are other
RADVD-enabled devices on the LAN.
Page 65 / 150
Configuring Network
Configuring IPv6
Cisco CVR100W Wireless-N VPN Router Administration Guide
63
3
STEP
3
Click
Save
.
Configuring Advertisement Prefixes
To configure the RADVD available prefixes:
STEP 1
Choose
Networking
>
IPv6 Configuration
>
Advertisement Prefixes
.
STEP
2
Click
Add Row
.
STEP
3
Enter the following information:
MTU
Enter the MTU size (0 or 1280 to 1500). The default is
1500
bytes.
The MTU is the size of the largest packet that can be
sent over the network. The MTU is used in RAs to
ensure all nodes on the network use the same MTU
value when the LAN MTU is not well-known.
Router Life Time
Enter the router lifetime value, or the time in seconds
that the advertisement messages exists on the route.
The default is
3600
seconds.
IPv6 Prefix Type
Choose one of the following types:
•
6to4:
6to4 is a system that allows IPv6 packets
to be transmitted over an IPv4 network. It is
used when an end user wants to connect to the
IPv6 Internet using their existing IPv4
connection.
•
Global/Local:
A locally unique IPv6 address
that you can use in private IPv6 networks or a
globally unique IPv6 Internet address.
SLA ID
If you choose
6to4
as the IPv6 prefix type, enter the
Site-Level Aggregation Identifier (SLA ID).
The SLA ID in the 6to4 address prefix is set to the
interface ID of the interface on which the advertise-
ments are sent.

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