Configuring Networking

Configuring IPv6

Cisco RV120W Administration Guide

42

2

Configuring IPv6

If you have an IPv6 network, see the following sections.

Configuring the IP Mode

To configure IPv6 properties on the Cisco RV120W, set the IP mode to IPv6:

STEP 1

Choose Networking > IPv6 > IP Mode.

STEP

2

Click the

IPv4 and IPv6 Dual-Stack

radio button.

STEP

3

Click Save.

Configuring IPv6 WAN Settings

Configuring WAN properties for an IPv6 network differs depending on which type

of Internet connection you have. See the sections below for detailed instructions.

The Cisco RV120W can be configured to be a DHCPv6 client of the ISP for this

WAN or a static IPv6 address provided by the ISP can be assigned.

Configuring DHCPv6

When the ISP allows you to obtain the WAN IP settings via DHCP, you need to

provide details for the DHCPv6 client configuration.

STEP 1

Choose IPv6 > IPv6 WAN (Internet).

STEP

2

In the WAN (Internet) Address (IPv6) field, choose DHCPv6.

STEP

3

Choose if the DHCPv6 client on the gateway is stateless or stateful.

If a stateful

client is selected, the gateway connects to the ISP's DHCPv6 server for a leased

address. For stateless DHCP, it is not necessary to have a DHCPv6 server

available at the ISP. Instead, an ICMPv6 discover message will originate from the

Cisco RV120W and is used for auto-configuration.

STEP

4

Click Save.

Configuring Networking

Configuring IPv6

Cisco RV120W Administration Guide

43

2

Configuring a Static IP Address

If your ISP assigns you a fixed address to access the Internet, choose this option.

The information needed for configuring a static IP address can be obtained from

your ISP.

STEP 1

Choose IPv6 > IPv6 WAN (Internet).

STEP

2

In the WAN (Internet) Address (IPv6) field, choose Static IPv6.

STEP

3

Enter the IPv6 IP address assigned to your firewall.

STEP

4

Enter the IPv6 prefix length defined by the ISP. The IPv6 network (subnet) is

identified by the initial bits of the address which are called the prefix (for example,

in the IP address 2001:0DB8:AC10:FE01::, 2001 is the prefix). All hosts in the

network have identical initial bits for their IPv6 address; the number of common

initial bits in the network’s addresses is set in this field.

STEP

5

Enter the default IPv6 gateway address, or the IP address of the server at the ISP

that this firewall will connect to for accessing the internet.

STEP

6

Enter the primary and secondary DNS server IP addresses on the ISP's IPv6

network. DNS servers map Internet domain names (for example, www.cisco.com)

to IP addresses.

STEP

7

Click Save.

Configuring IPv6 LAN Properties

In IPv6 mode, the LAN DHCP server is enabled by default (similar to IPv4 mode).

The DHCPv6 server assigns IPv6 addresses from configured address pools with

the IPv6 Prefix Length assigned to the LAN.

To configure IPv6 LAN properties:

STEP 1

Choose Networking > IPv6 > IPv6 LAN (Local Area Network).

STEP

2

Under LAN TCP/IP Setup, in the IPv6 Address field, enter the IP address of the

Cisco RV120W. The default IPv6 address for the gateway is fec0::1. You can

change this 128 bit IPv6 address based on your network requirements.

STEP

3

Enter the IPv6 prefix length. The IPv6 network (subnet) is identified by the initial

bits of the address called the prefix. By default, the prefix is 64 bits long. All hosts

Configuring Networking

Configuring IPv6

Cisco RV120W Administration Guide

44

2

in the network have the identical initial bits for their IPv6 address; the number of

common initial bits in the network's addresses is set by the prefix length field.

STEP

4

In the DHCPv6 field, choose to disable or enable the DHCPv6 server. If enabled,

the Cisco RV120W assigns an IP address within the specified range plus

additional specified information to any LAN endpoint that requests DHCP-served

addresses.

STEP

5

Choose the DHCP mode. If stateless is selected, an external IPv6 DHCP server is

not required as the IPv6 LAN hosts are auto-configured by the Cisco RV120W. In

this case, the router advertisement daemon (RADVD) must be configured on this

device and ICMPv6 router discovery messages are used by the host for auto-

configuration. There are no managed addresses to serve the LAN nodes.

If stateful is selected, the IPv6 LAN host will rely on an external DHCPv6 server to

provide required configuration settings.

STEP

6

(Optional) Enter the domain name of the DHCPv6 server.

STEP

7

Enter the server preference. This field is used to indicate the preference level of

this DHCP server. DHCP advertise messages with the highest server preference

value to a LAN host are preferred over other DHCP server advertise messages.

The default is 255.

STEP

8

Choose the DNS proxy behavior:

•

Use DNS Proxy—Check this box to enable DNS proxy on this LAN, or

uncheck this box to disable this proxy. When this feature is enabled, the

firewall acts as a proxy for all DNS requests and communicate with the ISP’s

DNS servers (as configured in the WAN settings page).

•

Use DNS from ISP—This option allows the ISP to define the DNS servers

(primary/secondary) for the LAN DHCP client.

•

Use below—If selected, the primary/secondary DNS servers configured

are used. If you chose this option, enter the IP address of the primary and

secondary DNS servers.

STEP

9

Enter the lease/rebind time. Enter the duration (in seconds) for which IP addresses

will be leased to endpoints on the LAN.

STEP 10

Click Save.

Configuring Networking

Configuring IPv6

Cisco RV120W Administration Guide

45

2

Configuring IPv6 Address Pools

This feature allows you to define the IPv6 delegation prefix for a range of IP

addresses to be served by the Cisco RV120W’s DHCPv6 server. Using a

delegation prefix, you can automate the process of informing other networking

equipment on the LAN of DHCP information specific for the assigned prefix.

STEP 1

Choose Networking > IPv6 > IPv6 LAN (Local Area Network).

STEP

2

In the IPv6 Address Pool Table, click Add.

STEP

3

Enter the starting IP address and ending IP address of the pool.

STEP

4

Enter the prefix length. The number of common initial bits in the network’s

addresses is set by the prefix length field.

STEP

5

Click Save.

Configuring IPv6 Routing

To configure IPv6 routing, see the following sections.

Configuring Dynamic Routing

RIPng (RFC 2080) 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 will remove these routes from

the routing table.

On the Cisco RV120W, RIPng is disabled by default.

Configuring Networking

Configuring IPv6

Cisco RV120W Administration Guide

46

2

To configure RIPng:

STEP 1

Select Networking > IPv6 > Routing.

STEP

2

Under RIPng, check Enable.

STEP

3

Click Save.

Configuring Static Routing

You can configure static routes to direct packets to the destination network. A

static route is a pre-determined 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 a static route:

STEP 1

Select Networking > IPv6 > Routing.

STEP

2

In the list of static routes, click Add.

STEP

3

Enter the route name.

STEP

4

If a route is to be immediately active, check the Active box. When a route is added

in an inactive state, it will be listed in the routing table, but will not be used by the

firewall. The route can be enabled later. This feature is useful if the network that the

route connects to is not available when you added the route. When the network

becomes available, the route can be enabled.

STEP

5

In the IPv6 destination field, enter the IPv6 address of the destination host or

network for this route.

STEP

6

In the IPv6 prefix length field, enter the number of prefix bits in the IPv6 address

that define the destination subnet.

STEP

7

Choose the physical network interface through which this route is accessible:

•

WAN—The route goes through the WAN interface.

•

LAN—The route goes through the LAN interface.