DHCPv6 Relay Agent #787
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DHCPv6 Relay Agent #787
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tahmed-dev
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Jun 29, 2021
lguohan
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Jul 1, 2021
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| # Overview | ||
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| SONiC currently supports DHCPv4 Relay via the use of open source ISC DHCP package. However, DHCPv6 specification does not define a way to communicate client link-layer address to the DHCP server where DHCP server is not connected to the same network link as DHCP client. DHCPv6 requires all clients prepare and send a DUID as the client identifier in all DHCPv6 message exchanges. However, these methods do not provide a simple way to extract a client's link-layer address. Providing option 79 in DHCPv6 Relay-Forward messages will help carry the client link-layer address explicitly. The server needs to know the client's MAC address to allow DHCP Reservation, which provides pre-set IP address to specific client based on its physical MAC address. The DHCPv6 relay agent is able to read the source MAC address of DHCPv6 messages that it received from client, and encapsulate these messages within a DHCPv6 Relay-Forward message, inserting the client MAC address as option 79 in the Relay-Forward header sent to the server. |
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Please add details on why we think opensource ISC package is not a right fit for this DHCP6 relay enhancements.
lguohan
reviewed
Jul 21, 2021
| 3. Request, Renew, Rebind: DHCPv6 client sends a REQUEST message to request configuration parameters(IP address or delegated prefixes) from the DHCPv6 server | ||
| 4. Reply: DHCPv6 server sends a REPLY message containing assigned addresses and configuration parameters in response to a CONFIRM message that confirms or denies that the addresses assigned to the client are appropriate to the link to which the client is connected. REPLY message acknowledges receipt of a RELEASE or DECLINE message. | ||
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please upload the image to this folder images directory.
lguohan
reviewed
Jul 21, 2021
| type inet6:ip-address; | ||
| } | ||
| leaf options { | ||
| type uint16; |
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does this only allow one option, what if we have other options? I suggest to define option79 true/false. some options needs parameter. it is difficult to define a universal way to define options.
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Updated option 79 to have a bool type! Future options added can define its own parameter.
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tahmed-dev
reviewed
Jul 30, 2021
tahmed-dev
approved these changes
Aug 10, 2021
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