DNAv6 Goals
JinHyeock Choi, Samsung AIT
jinchoe@samsung.com
2004.03.02
DNAv6 Overview
• Upon a new link layer connection, a host may or may
not have a valid IP configuration. It may ascertain the
validity of its IP configuration by checking link change.
DNAv6 Problems
• No means to represent a link
– In RA message, neither router address nor prefixes can do it.
– Link-layer hint can’t detect Link change by itself.
• The ambiguity of RA information
– Link local scope of router address
– Prefix omission
• The delay to check the reachability of current AR
– It’s difficult to detect something is NOT there.
– Roughly 3 secs for NUD
• Random Delay in RS/ RA exchange
• No agreed way to do DNAv6
DNAv6 Goals
1. DNA schemes should ascertain the validity of current IP
configuration by detecting currently attached link. It should
recognize and determine whether IP configuration change is
needed and initiate a new configuration if necessary.
2. DNA schemes should detect link change fast to prevent service
disruption.
3. DNA schemes should not assume link change erroneously.
4. DNA schemes should not cause undue signaling on a wireless link.
5. DNA schemes should make use of existing signaling mechanisms
where available.
6. DNA schemes should make use of signaling within the link
DNAv6 Goals
7. DNA schemes should be safe with respect to DAD.
8. DNA schemes should be compatible with existing IP security
schemes (SEND, IPSec)
9. A host configured for DNA should not expose the host to
additional man in the middle or identity revealing attacks.
10. A host or router configured for DNA should not expose itself or
other devices on the link to additional denial of service attacks
11. Routers Supporting DNA should work appropriately with hosts
using unmodified configuration schemes.
12. Hosts supporting DNA should be able to work with unmodified
routers and hosts which do not support DNA solutions.
Renumbering Issue
• Should DNAv6 solution take in consideration the
problems caused by renumbering?
• Maybe No
– Renumbering is usually well advertised beforehand.
– Renumbering has nothing to do with link change.
– Renumbering is independent of a new link-layer connection.