Siemens SIMATIC NET System Manual page 33

IP addresses per interface
Header
Security
Fragmentation
Checksum in the header
Options in the header
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
IPv4
One IP address
Checksum
•
Variable length
•
Fragmentation in the
•
header
No security
•
For encryption in IPv4
which is required for ex-
ample with VPN, is always
the responsibility of the
higher layers
Host and router
yes
yes
Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
IPv6
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.
Checking at a higher layer
•
Fixed preset size
•
Fragmentation in the extension header
•
IPsec via extension header
•
With IPsec, IPv6 brings a direct integration via the extension
header
Only endpoint of the communication
no
no
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