N+I Shownet NLA2 report 2000
Network Name
N+I Shownet
History
In Networld+Interop(N+I) 2000 Tokyo, which is held in the
Convention Center(Makuhari Messe) in 2000.6.7-9, fully
supported IPv6 backbone as following was provided.
- IPv6 was available everywhere in the convention center.
- IPv6 native network based on commercial products.
- Terminal Cluster
- Translation(TCP relay) service to access the IPv4 Internet.
Network Topology
The IPv6 backbone of N+I Shownet was constructed separately from
the IPv4 backbone.
To the users(exhibitors and visitors), both reachability of
IPv6 and IPv4 were available on each network medium.
Routing
To the hosts, default route was advertised by RA.
Between the backbone routers and the routers of exhibition
companies, default route and subnet routes were exchanged
by RIPng.
Address Assignment
Address prefixes were assigned according to the purposes, and were
advertised with RA.
| Prefix | purpose |
| 2001:0200:0123:0000::/56 | Backbone |
| 2001:0200:0123:0100::/56 | Ethernet(Hall 1-3) |
| 2001:0200:0123:0200::/56 | Ethernet(Hall 7,8) |
| 2001:0200:0123:0300::/56 | Ethernet(Hall 4-6) |
| 2001:0200:0123:0400::/56 | IPv6 ShowCase |
| 2001:0200:0123:1000::/52 | ADSL |
| 2001:0200:0123:2000::/52 | Terminal Cluster |
Four exhibition companies which demanded the subnetwork were
provided with a prefix with a length of 60-64 bits,
respectively.
| Prefix | Exhibition Company |
| 2001:0200:0123:0380::/64 | A |
| 2001:0200:0123:1080::/60 | B |
| 2001:0200:0123:1090::/64 | C |
| 2001:0200:0123:10a0::/64 | D |
Trouble
Since the notices of the prefixes assigned to the exhibition
companies were mistaken, a prefix of the subnetworks overlapped.
Consequently, the problem that reachability was lost for
either two corresponding subnetworks arose.