Feature andFunctionality Documentation andChapter LocationSecure Shell (SSH) serversupport over IPv6(inbound SSH) Layer 3onlySecure Shell (SSH) Overan IPv6 TransportIPv6 Access ControlListsIPv6 Access Control Listsin the Dell NetworkingOS Command LineReference Guide.IPv6 MulticastMLDv1/v2 IPv6 PIM in the DellNetworking OSCommand LineReference Guide.ICMPv6ICMP for IPv6 combines the roles of ICMP, IGMP and ARP in IPv4. Like IPv4, it provides functions forreporting delivery and forwarding errors, and provides a simple echo service for troubleshooting. The DellNetworking OS implementation of ICMPv6 is based on RFC 4443.Generally, ICMPv6 uses two message types:• Error reporting messages indicate when the forwarding or delivery of the packet failed at thedestination or intermediate node. These messages include Destination Unreachable, Packet Too Big,Time Exceeded and Parameter Problem messages.• Informational messages provide diagnostic functions and additional host functions, such as NeighborDiscovery and Multicast Listener Discovery. These messages also include Echo Request and EchoReply messages.The Dell Networking OS ping and traceroute commands extend to support IPv6 addresses. Thesecommands use ICMPv6 Type-2 messages.Path MTU DiscoveryPath MTU, in accordance with RFC 1981, defines the largest packet size that can traverse a transmissionpath without suffering fragmentation. Path MTU for IPv6 uses ICMPv6 Type-2 messages to discover thelargest MTU along the path from source to destination and avoid the need to fragment the packet.The recommended MTU for IPv6 is 1280. Greater MTU settings increase processing efficiency becauseeach packet carries more data while protocol overheads (for example, headers) or underlying per-packetdelays remain fixed.446 IPv6 Routing
