1. An Address Management Mechanism for Blocking External Communications in IPv6 Networks 1

2. Outline Introduction Related work External communication blocking Implementation result Conclusions References 2

3. Introduction IPv4 address allocation has officially ended, IPv6 network users are increasing. Using RA(Router Advertisement) message to block external communication of a host. 3

4. Related work ICMPv6 (Internet Control Message Protocol for IPv6) RA 4

5. Related work(Conf.) SLAAC(Stateless Address AutoConfiguration) 5

6. External communication blocking 6

7. External communication blocking(conf.) 7

8. Implementation result 8

9. Conclusions The mechanism has blocked the external communication of the malicious host by using two modified RA messages. 9