Siemens SIMATIC NET System Manual page 34

Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
ICMP
Ports
Router discovery
Quality of Service
Types of frame
Identification of DHCPv6 cli-
ents/server
34
IPv4
ICMP
UDP
RIP: UDP 520
optional
Type of Service (ToS) for
prioritization
Broadcast, multicast,
unicast, anycast
Client ID:
MAC address
IPv6
ICMPv6
Router Solicitation (ICMPv6 type 133)
Sent by a client to localize servers.
Router Advertisement Messages (ICMPv6 type 134)
Sent by a server as response to a Solicit message to indicate
availability.
Neighbor Solicitation Messages (ICMPv6 type 135)
Node send Neighbor Solicitation messages to obtain the data
link layer address of a neighbor node. Neighbor Solicitation
messages are used to establish whether a neighbor node is
still reachable via a buffered data link layer address. Neigh-
bor Solicitation messages are also used to recognize dupli-
cate addresses.
Neighbor Advertisement Messages (ICMPv6 type 136)
A node sends Neighbor Advertisement messages as a reac-
tion to a Neighbor Solicitation message. The node can also
send unsolicited Neighbor Advertisement messages, to make
a change in the data link layer address known.
Redirect Messages (ICMPv6 type 137)
Use Redirect messages to inform hosts of a better first hop to
a destination or to inform them that the destination is located
on the same link.
DHCP, ports client 546 & server 547
RIPng: 521
mandatory
When router discovery is used in addition, the node is in-
formed of the following
further IPv6 addresses
•
router addresses
•
further configuration parameters e.g. via DHCP
•
The prioritization is specified in the header field "Traffic
Class".
Multicast, unicast, anycast
DUID + IAID(s) = exactly one interface of the host
DUID = DHCP unique identifier
Identifies server and clients uniquely and should not change.
No modification when replacing network components.
IAID = Identity Association Identifier
at least one per interface is generated by the client and re-
mains unchanged when the DHCP client restarts
Three methods of obtaining the DUID
DUID-LLT
•
DUID-EN
•
DUID-LL
•
System Manual, 09/2019, C79000-G8976-C242-10
Industrial Ethernet