IPv6 ND stateful address autoconfiguration

["Sandeep.P A" <sandeeppa at huawei.com>]

Hi,

Please go through the RFC excerpts below and answer the query in the end.

 

              RFC 4862

========

5.5.2. Absence of Router Advertisements

Even if a link has no routers, the DHCPv6 service to obtain addresses

may still be available, and hosts may want to use the service. From

the perspective of autoconfiguration, a link has no routers if no

Router Advertisements are received after having sent a small number

of Router Solicitations as described in [RFC4861].

Note that it is possible that there is no router on the link in this

sense, but there is a node that has the ability to forward packets.

In this case, the forwarding node's address must be manually

configured in hosts to be able to send packets off-link, since the

only mechanism to configure the default router's address

automatically is the one using Router Advertisements.

 

RFC 4861

=========

6.3.7. Sending Router Solicitations

...

Once the host sends a Router Solicitation, and receives a valid

Router Advertisement with a non-zero Router Lifetime, the host MUST

desist from sending additional solicitations on that interface, until

the next time one of the above events occurs. Moreover, a host

SHOULD send at least one solicitation in the case where an

advertisement is received prior to having sent a solicitation.

Responses to solicited advertisements may contain more information

than unsolicited advertisements.

 

If a host sends MAX_RTR_SOLICITATIONS solicitations, and receives no

Router Advertisements after having waited MAX_RTR_SOLICITATION_DELAY

seconds after sending the last solicitation, the host concludes that

there are no routers on the link for the purpose of [ADDRCONF].

However, the host continues to receive and process Router

Advertisements messages in the event that routers appear on the link.

 

 

Query :

If a host sends MAX_RTR_SOLICITATIONS solicitations, and receives "no

Router Advertisements" after having waited MAX_RTR_SOLICITATION_DELAY

Here "no Router Advertisements" Is it means, RA with Non-zero lifetime or RA with zero lifetime ?

 

 

 

Love,

Sandeep

********************************************************************************************************
 This e-mail and attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient's) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!

 

--------------------------------------------------------------------
IETF IPv6 working group mailing list
ipv6 at ietf.org
Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6
--------------------------------------------------------------------