143| IPv6 Support AOS-W 6.5.3.x| User Guide
k. Select the router preference as High, Medium, or Low.
6. Click Apply.
In the CLI
Execute the following CLI commands to configure the neighbor discovery and RA options for a VLAN interface:
To configure neighbor discovery reachable time:
(host)(config) #interface vlan <vlan-id>
(host)(config-subif)#ipv6 nd reachable-time <value>
To configure neighbor discovery retransmit time:
(host)(config-subif)#ipv6 nd retransmit-time <value>
To configure IPv6 recursive DNS server:
(host)(config-subif)#ipv6 nd ra dns X:X:X:X::X
To configure RA hop-limit:
(host)(config-subif)#ipv6 nd ra hop-limit <value>
To configure RA interval:
(host) (config-subif)#ipv6 nd ra interval <value> <min-value>
To configure RA lifetime:
(host)(config-subif)#ipv6 nd ra life-time <value>
To enable hosts to use DHCP server for stateful address autoconfiguration:
(host)(config-subif)#ipv6 nd ra managed-config-flag
To configure maximum transmission unit for RA:
(host)(config-subif)#ipv6 nd ra mtu <value>
To enable hosts to use DHCP server for other non-address stateful autoconfiguration:
(host)(config-subif)#ipv6 nd ra other-config-flag
To specify a router preference:
(host)(config-subif)#ipv6 nd ra preference [High | Low | Medium]
To view the IPv6 RA status on the VLAN interfaces:
(host) #show ipv6 ra status
IPv6 Router Advertisement Proxy
An IPv6 network deployment typically has one or more upstream routers to delegate IPv6 prefixes through
Router Advertisements (RA) to clients. When a client connects to the network, it would begin with sending
Router Solicitations or DHCP IPv6 requests. In case of Stateless Address Auto-configuration (SLAAC) using RAs
where clients sends Router Solicitations (RS), upstream routers can either respond with unicast (L2/L3) RA or
with multicast RA. Whenever a new client joins the network, a unicast or a multicast RA is sent to from the
router to the client. If it is a multicast packet then existing clients also receive the RA, which results in increasing
the traffic. Starting from AOS-W 6.5.1.0, this issue is addressed by enabling IPv6 proxy RA to snoop incoming
unsolicited Router Advertisement and Router Solicitations packets.
You can enable IPv6 RAproxy using the CLI and WebUI.
In the WebUI
1. Navigate to the Configuration > Advanced Services > Stateful Firewall page and select the Global
Setting tab.
2. Select IPV6 Proxy Router Advertisement Enable check box.
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