Siemens SIMATIC NET - Positioning Devices and Cables for EMC

Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
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IPv4
IPv6
IP addresses per interface One IP address Multiple IP addresses
• LLA: Link Local Address (formed automatically) fe80::/64
Unique in the link, can however occur more than once
globally. With IPv6 is generated automatically for every
interface, serves for setting up the network by IPv6. A
ping to an LLU address requires specification of the ping
"interface" with %interfacenumber at the end of the desti-
nation address. Here, the host obtains information about
other IPv6 hosts and routers
• ULA: Unique Local Address - intended for NAT
that adopt the private addresses and may be routed but
not
but not globally unique. According to RFC 4193 routers
and firewalls should not pass these into the global Inter-
net
• GA: Global Unicast Address
that are globally unique and can be routed, currently eve-
ry address from the range 2000::/3 with the exception of
the ranges reserved for special purposes.
Header
• Checksum
• Variable length
• Fragmentation in the
header
• No security
• Checking at a higher layer
• Fixed preset size
• Fragmentation in the extension header
• IPsec via extension header
Security For encryption in IPv4
which is required for ex-
ample with VPN, is always
the responsibility of the
higher layers
With IPsec, IPv6 brings a direct integration via the extension
header
Fragmentation
Host and router
Only endpoint of the communication
Checksum in the header
yes
no
Options in the header
yes
no