Administrator Guide

Feature and Functionality Dell EMC Networking OS
Release Introduction
Documentation and Chapter
Location
S3100 series
Command Line Reference
Guide.
Telnet server over IPv6 (inbound
Telnet)
9.7.(0.1) Configuring Telnet with IPv6
Control and Monitoring in the
Dell EMC Networking OS
Command Line Reference
Guide.
Secure Shell (SSH) client
support over IPv6 (outbound
SSH) Layer 3 only
9.7.(0.1) Secure Shell (SSH) Over an
IPv6 Transport
Secure Shell (SSH) server
support over IPv6 (inbound
SSH) Layer 3 only
9.7.(0.1) Secure Shell (SSH) Over an
IPv6 Transport
IPv6 Access Control Lists 9.7.(0.1) IPv6 Access Control Lists in the
Dell EMC Networking OS
Command Line Reference
Guide.
IPv6 Multicast
MLDv1/v2 9.7.(0.1)
IPv6 PIM in the Dell EMC
Networking OS Command Line
Reference Guide.
ICMPv6
ICMP for IPv6 combines the roles of ICMP, IGMP and ARP in IPv4. Like IPv4, it provides functions for reporting delivery and forwarding
errors, and provides a simple echo service for troubleshooting. The Dell EMC Networking 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 the destination 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 Neighbor Discovery and Multicast Listener
Discovery. These messages also include Echo Request and Echo Reply messages.
The Dell EMC Networking OS ping and traceroute commands extend to support IPv6 addresses. These commands use ICMPv6
Type-2 messages.
Path MTU discovery
The size of the packet that can be sent across each hop in the network path without being fragmented is called the path maximum
transmission unit (PMTU). The PMTU value might differ for the same route between two devices, mainly over a public network,
depending on the network load and speed, and it is not a consistent value. The MTU size can also be different for various types of traffic
sent from one host to the same endpoint.
Path MTU discovery (PMTD) identifies the path MTU value between the sender and the receiver, and uses the determined value to
transmit the packets across the network. Path MTU, in accordance with RFC 1981, defines the largest packet size that can traverse a
transmission path without suffering fragmentation. Path MTU for IPv6 uses ICMPv6 Type-2 messages to discover the largest 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 the processing efficiency because each packet carries more data while protocol overheads (for example, headers) or
underlying per-packet delays remain fixed.
IPv6 Routing
365