35.1.3 Internet Protocol Version 6 (IPv6)
- <Structure of this section>
(1) IPv6 Packet Format
The formats and settings of IPv6 packets sent by the Switch conform to RFC8200. The following figure describes the format of an IPv6 packet.
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![[Figure Data]](./GRAPHICS/ZU315180.GIF)
(2) IPv6 packet header validity checking
The 40-octet IPv6 header contains eight fields and two addresses. The following figure shows the format of an IPv6 header.
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![[Figure Data]](./GRAPHICS/ZU315190.GIF)
The Switch checks the validity of the IPv6 headers in IPv6 packets when IP packets are received. The following table describes the IPv6 packet header items that are checked.
|
IPv6 packet header field |
Check item |
When a check error occurs Packet processing |
Whether to send an ICMPv6 message for a discarded packet |
|---|---|---|---|
|
Version |
Be version = 6 |
Discarded |
Do not send |
|
Traffic class |
Not checked. |
- |
- |
|
Flow label |
Not checked. |
- |
- |
|
Payload length |
Compare with the packet length. If the payload length is greater than the packet length, the packet is discarded. |
Discarded |
Do not send |
|
Compare with the packet length. The payload length must be less than the packet length. |
Discarded |
Do not send |
|
|
Next header |
Not checked. |
- |
- |
|
Hop limit |
The hop limit of the received packets directed to the local device is not checked. |
- |
- |
|
Source address |
The address is not a multicast address. |
Discarded |
Do not send |
|
Destination address |
The following conditions must be satisfied:
|
Discarded |
Do not send |
Legend:-: Not applicable
(3) IPv6 Extension Header Supported
The following table describes the IPv6 extension headers supported by the Switch.
|
IPv6 extension header |
Type of IPv6 packet |
|
|---|---|---|
|
With the departing station of the equipment Packet to be |
When the Switch arrives at the station Packet to be |
|
|
Hop-by-Hop Options Header |
OK |
OK |
|
Routing Header |
NG |
NG |
|
Fragment Header |
OK |
OK |
|
Authentication Header |
NG |
NG |
|
Encapsulating Security Payload Header |
NG |
NG |
|
Destination Options Header |
NG |
OK |
(Legend) OK: Supported NG: Not supported-: No header processing