2005 VersionIPv6 Deployment Guideline
Case Study of IPv6 Usagein Operation Branch System in SOHO
Environment

March 2005

IPv6 Promotion Council of Japan
DP-WG

SOHO SWG

1Present State of Company A
In this section, we study an IPv6 deployment example of a shop network employed by a certain
travel agent.
Company A is a travel agent on a nationwide scale and runs nearly 1,000 branches throughout
the country.

They control the sales of each branch and reservation state centrally online.

Each operation branch has 5 - 10 staff, and PCs, printers and facsimile machines as officeterminals there.

One of A’s characteristics is that they close and merge branches frequently.

The network environment is in a Star type configuration centralized on the headquarters, andthey use broadband routers that support VPN and connect the Headquarters and operation
branches via the Internet VPN.

This VPN is composed as one segment, and IPv4 private

address is used for the IP address.
Company A performs NAT using broadband in order to reduce the operational burden caused bymoving, etc., and uses the same IPv4 network address at all bases (192.168.0.0/24).

In thiscompany, the network is created, removed or moved at the timing of closing or merging branches.

Issues of Company A
However, because they are not able to station IT staff at each branch on a full-time basis, thesystem management of many small operational branches such as this case causes a problem ofheavy operational burden such as the large amount of man-hours required to maintain terminals or
to setup at closing and merging branches.
Company A is thinking of deploying an auto maintenance system of terminals in order to realize adirect push distribution to each terminal, and to obtain the terminal status dynamically from theserver.
The requirements to realize this sort of system are;・operation of IP addresses in a fixed manner in order to specify terminals directly from a server・assignment of auto addresses in order to simplify operation.

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Solution Using IPv6
When IPv6 is used on an operation branch network such as that of Company A, it is possible torealize the system shown below.
1. Terminal addresses are fixed when IPv6 addresses are used.
Direct access from a server becomes possible based on fixed address.
Operational burden for assignment of fixed addresses is reduced.
2. Auto assignment of network prefix of the site
When Prefix Delegation is used, not only host addresses but also network prefixes canbe distributed automatically.
The burden from moving is reduced.
3. Influence of independent path control with IPv4 on existing networks is eliminated.
Separation from existing line of application traffic by using policy routing of Iv6 and Iv4

Network Concept When IPv6 is Used

Headquarters

Maintenance server

Access to terminals
of branches from aserver
・Content distribution
・State checkingOperation
Broadband routerbranchInternetVPNInternet(IPv4)

supporting IPv6PC

Operation
branchOperation
branchOperation
branchOperation
branchPrinter3

In this solution, IPv4 communication for business use and IPv6 communication for maintenanceof operation branches are put through on Internet VPN. In the network of the headquarters, only
the segment of the maintenance server is changed to support IPv6 and other segments inside thecompany are left as they are.

IPv6 communication of maintenance server is performed from agateway set in the headquarters using “IPv6 over IPv4 tunneling”.
A dual stack network is configured inside operation branches. Then, two types of protocols areused selectively according to the application used as IPv4 for business operation and IPv6 formaintenance. “IPv6 over IPv4 tunneling” terminates with the routers of each branch.

Configuration of Network

Operation branch

PC

IPv4
communication
single direction
initiate

Dual
IPv4
Stack
Tunnelnet
net router
Dual

VPN
GW
supporting
IPv6

Headquarters
Operation
serverTunnelrouter

IPv4
net
IPv6

Tunnelrouter

IPv6
net

MaintenanceserverIPv6
communication,
dual direction
initiation■ Inside Headquarters◆ Segment of maintenance server only is changed to support IPv6
◆ Network inside the company keeps IPv4 as it is◆ IPv6 communication of maintenance server is performed from GW using “IPv6 over IPv4”■ Inside operation branch◆ Communication is performed using Dual Stack◆ IPv6 and IPv4 are used selectively according to applications usedBusiness operation: IPv4, Maintenance: IPv64

Address Configuration
Addresses are configured as shown below.
IPv6 server segment
Reserve 2000:200:100:0::/56 (for 256 segments).
Assign one segment (/64) according to usage.
Address of base
For IPv6, reserve 2000:200:100:8000::/52 (for 4,096 segments).
Assign one segment (/64) to each base
For IPv4, fix address inside LAN at 192.168.0.0/24.
Router address is 192.168.0.1
Host address (/32) as address on WAN side

Concept of the System When Using IPv6Fig. below shows the establishment process of IPv6 for maintenance in this example case.

Businessapplication
Maintenanceapplication

PC

Routersupporting
IPv6

RADIUSDNSVPN GWsupporting
IPv6

IPv4
net

①Establishment of IPv4 connection②VPN setting request③ Authentication request④OK + IPv6 prefix assignment⑤IPv6 prefix (DHCP PD)⑥IPv6 prefix assignment⑦DNS registration of host address⑧Communication with IPv4 (NAT) for business application and IPv6 (P2P) for maintenance5Business server
MaintenanceserverEvaluation of Cost Reduction
The following is a cost comparison of former IPv4 network and above mentioned IPv6 solution.
Deployment cost:
Design cost – Cost for IPv6 is calculated as 1.3 times that for IPv4
Setup work cost – No need to change terminal settings (IP address) → reduction by 30%
Router purchased – Assuming router model is not changed, so no change for the case of IPv6 aswell.
Running cost:Line cost – No change in line cost because a tunnel on IPv4 is used.
Moving cost (when 100 bases move in half term, twice a year) – No terminal settings (IPaddress) are changed for IPv6 → reduction of setup work cost by 30%

Comparison of work
cost over 3 years

Cost factors


Deployment cost

Deployment cost: Once at beginning

Moving cost Design cost
Reductionby 15%

 Calculated as 1.3 times for IPv6
 Setup work cost
 No terminal setting (IP address) ischanged for IPv6
 Reduction by 30%
 Router purchased
 Assuming no router model ischanged, so no change in the caseof IPv6 either.

Running: Every month Line cost
 No change in line cost because atunnel on IPv4 is used.

Moving cost: Twice a year 100 bases move in half term Setup work cost
 No terminal setting (IP address) ischanged for IPv6
 Reduction by 30%

IPv4IPv6

The side-effects shown below will be received.
・Prevention of duplicate investment for propagation of IPv6 in future
Infrastructure is capable of supporting IPv6 and helpful in learning IPv6 skill.
・Easier usage of other new applications realized by IPv6
Hard IP phones, wireless LAN phones, sensor net and P2P secure communication will be easierfor the user.

6SWG Members of SOHO Segment, DP-WG(titles omitted)

SWG chair
Inomata (Fujitsu Limited)
Sakauchi (NEC Corporation)
Tsukioka (Hitachi, Ltd.)

Members
Arano (Intech NetCore, Inc.)
Nakai (NTT Communications Corporation)
Nakahara (NEC Corporation)
Kanaumi (NEC Corporation)
Ohira (Ricoh Co., Ltd.)Ito (Canon Inc.)
Yamamoto (Shimizu Corporation)
Yoshioka (Toyota Info Technology Center Co., Ltd.)
Ozaki (Fujitsu Limited)

Inquiries
For questions related to this Guideline, please send email to the following address:
IPv6 Promotion Council of Japan DP-WG / e-mail: wg-dp-comment@v6pc.jp

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