Depreciation of site local address

Transcription

1 Depreciation of site local address Tomohiro Fujisaki Nippon Telegraph and Telephone Corporation

2 Contents What is site-local address? Why was site-local address depreciated? Substitute for site-local address

3 Site-Local Address One of IPv6 local-use unicast address Defined in RFC 3513 IPv6 Addressing Architecture designed to be used for addressing inside of a site without the need for a global prefix. Routers must not forward any packets with site-local source or destination addresses outside of the site.

4 Format of site-local address Subnet Subnet ID ID 10 bits fec0::/10 Format of Site-local address 54 bits 128 bits Interface ID ID 64 bits A subnet ID may be up to 54-bits long, it is expected that globally-connected sites will use the same subnet IDs for site-local and global prefixes. 16 bit subnet ID

5 Site-local address: What was the problem? Site-local address has so many problems Ambiguity: What is a site? Where is the site border? Address leaking problem IP layer, DNS, Upper Layer Site-border router issues Routing table, forwarding table lack of routing protocol functionality to handle it Mobile IP issue etc.

6 Site-local address: What was the problem? Site-local address has so many problems Ambiguity: What is a site? Where is the site border? Address leaking problem IP layer, DNS, Upper Layer Site-border router issues Routing table, forwarding table lack of routing protocol functionality to handle it Mobile IP issue etc.

7 Site-local address problem: Address Ambiguity Site boundary must be configured by administrators fec0::2 PC2 cannot communicate fec0::4 PC4 PC1 fec0::1 Possible to communicate Site Border Router fec0::3 PC3 Possible to communicate Site A

8 Site-local address: What was the problem? Site-local address has so many problems Ambiguity: What is a site? Where is the site border? Address leaking problem IP layer, DNS, Upper Layer Site-border router issues Routing table, forwarding table lack of routing protocol functionality to handle it Mobile IP issue etc.

9 Site-local address: What was the problem? Site-local address has so many problems Ambiguity: What is a site? Where is the site border? Address leaking problem IP layer, DNS, Upper Layer Site-border router issues Routing table, forwarding table lack of routing protocol functionality to handle it Mobile IP issue etc.

10 Site-local address problem: Site border router issues Complex implementation of Site border router fec0::/48 fec0::/48 fec0::2 PC2 fec0::4 PC4 PC1 fec0::1 Possible to communicate Site Border Router fec0::3 PC3 Possible to communicate Site A Site B Routing Table for Site A Routing Table for Site B Routing Table for Global Address

11 Site-local address: What was the problem? Site-local address has so many problems Ambiguity: What is a site? Where is the site border? Address leaking problem IP layer, DNS, Upper Layer Site-border router issues Routing table, forwarding table lack of routing protocol functionality to handle it Mobile IP issue etc.

12 Substitution for site-local address IPv6 Local address requirements: At 57 th IETF, requirements for local address was discussed Requirements Easy to Acquire Stable Multiple Link Support Well-known Prefix Global Uniqueness Provider Independence Applicable in Managed/Unmanaged Environments Compatible with Site Naming System Compatible with VPN Multiple Addressing described in draft-hain hain-templin-ipv6-limitedrange-00.txt

13 Proposed local address Unique Local IPv6 Unicast Address Globally unique address local and central allocation Use for local communications (inside of a site) not expected to be routable on the global Internet Draft-hinden hinden-ipv6-global-local-addr-02.txt This draft will be published as a WG draft Meets previous requirements

14 Unique Local IPv6 Unicast Address Prefix Prefix n bits Format of Unique Local IPv6 Unicast Address Global Global ID ID m bits Subnet Subnet ID ID 16 bits 128 bits Interface ID ID 64 bits /7 prefix and 41 bits Global ID are proposed (FC00::/7) Two type of Global ID FC00::/8 Centrally assigned FD00::/8 Locally assigned Each has 40 bit space to allocate

15 Info: IPv6 Documentation address 2001:0DB8::/32 can be used for documentation purpose examples of IP addresses in use, in technical books, articles, and training material Possible to use at any time without any application This address space is also proposed at IETF draft-huston huston-ipv6-documentation-prefix-00.txt

16 Conclusion IPv6 site-local address was depreciated Standardization of new local address is now in progress Unique Local IPv6 Unicast Address