1
1中国电信集团公司（ China Telecom Corporation）
IPv6 study in China Telecom
赵慧玲 解冲锋
2中国电信集团公司（ China Telecom Corporation）
Content
The significance of IPv6 to telecom
operators
The Challenges for IPv6
The works of China Telecom
Further research
3中国电信集团公司（ China Telecom Corporation）
The significance of IPv6 to ISP
Large address Space
Efficient routing
Improved QoSsupport
Security support
Mobility support
etc.
4中国电信集团公司（ China Telecom Corporation）
Large address space
A global-reachable address for everything.
Enables end-to-end reachability and end-to-end
communications.
support multiple levels of hierarchy inside the
address space.
Aggregation of prefixes announced in the global
routing table,efficient and scalable routing.
Multiple simultaneous addresses for hosts,
More flexibility,new functionalities.
others...
5中国电信集团公司（ China Telecom Corporation）
Efficient routing
Simple packet header
–Extension headers
–No checksum at the IP layer.
–Routing extension header
No recalculations by the routers.
No packet segmentation in routers
Provides routing efficiency,performance
and forwarding rate scalability.
Enables faster forwarding rate and end-
nodes processing.
6中国电信集团公司（ China Telecom Corporation）
Improved QoS support
A new flow label inside the IP header.
–Enables per flow processing for differentiation
at the IP layer.
IPv6 header is designed to optimize
software implementation
But does not solve the QoSproblem
completely
–Still under discussion
2
7中国电信集团公司（ China Telecom Corporation）
IPv6 Security support
AH and ESP extension header used with
IPsec
Built-in on IPv6
–Means any node can use it.
End-to-end network security (integrity,
authentication,confidentiality),
8中国电信集团公司（ China Telecom Corporation）
Mobility support
Built-in on IPv6
–indicates any node can use it
No foreign agent
Solve the problem of,triangle routing”in
mobile IPv4
Efficient routing means performance for
end-users.
Others...
9中国电信集团公司（ China Telecom Corporation）
The Challenges for IPv6
As a new technique,IPv6 is also market-
driven,
–IPv6 application is sparse,no specific
application which can only be based on IPv6,
–According to our estimation,the IPv4 address
will still be enough by the end of 2008.
–Current 3G deployment and NGN equipment is
mainly based on IPv4.
10中国电信集团公司（ China Telecom Corporation）
The works of China Telecom
Address application
Equipment test
IPv6 testbed
Technical Experiments
11中国电信集团公司（ China Telecom Corporation）
Address application
China Telecom filled the IPv6 allocation
request form and successfully received the
address block from APNIC in Sept,2002.
2001:0c68::/32
12中国电信集团公司（ China Telecom Corporation）
IPv6 testbed of China Telecom
China Telecom has built a IPv6 testbed in
Hunan for IPv6 network and service trial.
–Composed of equipments from GSR to Access
devices
–Interconnection with other IPv6 networks
–Access network:ADSL,LAN,WLAN,
–Provide access service to end users
3
13中国电信集团公司（ China Telecom Corporation）
Network topology
14中国电信集团公司（ China Telecom Corporation）
Service and Application
Currently,multiple services have been
supported by this network
–Web / VoIP / Streaming media/ Video
conferencing / PDA
–But these products and services are
experimental
15中国电信集团公司（ China Telecom Corporation）
Technical Experiments
In addition to Network experiment,China
Telecom also done some experiments
focused on specific IPv6 techniques,such as
–IPv6 in Broadband Access Network
–IPv4/IPv6 transition
–IPv6 Security
–IPv6 QoS
–IPv6 Application
16中国电信集团公司（ China Telecom Corporation）
Some Results
Current IPv6 deployment in ADSL scenario
are not mature,more work need to be done
to support more terminals over various
access networks.
Tunneling and double stack mechanism
have been widely supported in current IPv6
routers,but few BAS equipment support
IPv6,Automatic tunneling will be useful for
double stack user to visit IPv6 network.
17中国电信集团公司（ China Telecom Corporation）
Some Results
Some equipments have QoS functions
similar to IPv4,but whether IPv6 QoS
functions can meet future requirements is
still doubted.
IPv6 IPsec has been partly implemented in
Microsoft Windows and FreeBSD operating
system,but have not been widely supported
in Router equipments.
18中国电信集团公司（ China Telecom Corporation）
Some Results
Various IPv6 based applications products
has emerged,such as Web,VoIP,Video
conferencing,and Streaming media,But
there is still a great gap to transform these
applications into commercial services.
4
19中国电信集团公司（ China Telecom Corporation）
Further research
IPv6 Access solution
IPv4/IPv6 transition/Interconnection with
other networks
Business model
20中国电信集团公司（ China Telecom Corporation）
IPv6 Access solution
IPv6 solution in access network is very important,
which is the point that IPv6 will show its
advantages.
Multiple access solution will be designed,for
–there are Different access method,ADSL,LAN,
WLAN,3G,satellite,etc
– there are various user terminals,PC,mobile phone,
PDA,home devices,automobile,etc
The issues that should be addressed by each access
solution are address allocation,naming,AAA and
mobility.
21中国电信集团公司（ China Telecom Corporation）
IPv4/IPv6 transition
Applications and services is the engine of
IPv4/IPv6 transition.
Smooth transition maybe be only a dream.
Telecom operators should find a way to
integrate various transition techniques to
create a transition plan for future transition
Different operators have different transition
procedures due to the difference between
their networks.
22中国电信集团公司（ China Telecom Corporation）
Business model
Business model will be the most important
for IPv6 success,which is the drive for
IPv4/IPv6 transition.
The future IPv6 network will support more
wide variety of services than current IPv4
network.
Different IPv6 applications have different
business model,
23中国电信集团公司（ China Telecom Corporation）
Suggestions
Continues to research and doing experiment.
Emphasize the cooperation with other ISPs,
equipment vendors,universities and
research communities.
Focus on IPv6 application and service
development and business model.
24中国电信集团公司（ China Telecom Corporation）
THANK YOU ！
1中国电信集团公司（ China Telecom Corporation）
IPv6 study in China Telecom
赵慧玲 解冲锋
2中国电信集团公司（ China Telecom Corporation）
Content
The significance of IPv6 to telecom
operators
The Challenges for IPv6
The works of China Telecom
Further research
3中国电信集团公司（ China Telecom Corporation）
The significance of IPv6 to ISP
Large address Space
Efficient routing
Improved QoSsupport
Security support
Mobility support
etc.
4中国电信集团公司（ China Telecom Corporation）
Large address space
A global-reachable address for everything.
Enables end-to-end reachability and end-to-end
communications.
support multiple levels of hierarchy inside the
address space.
Aggregation of prefixes announced in the global
routing table,efficient and scalable routing.
Multiple simultaneous addresses for hosts,
More flexibility,new functionalities.
others...
5中国电信集团公司（ China Telecom Corporation）
Efficient routing
Simple packet header
–Extension headers
–No checksum at the IP layer.
–Routing extension header
No recalculations by the routers.
No packet segmentation in routers
Provides routing efficiency,performance
and forwarding rate scalability.
Enables faster forwarding rate and end-
nodes processing.
6中国电信集团公司（ China Telecom Corporation）
Improved QoS support
A new flow label inside the IP header.
–Enables per flow processing for differentiation
at the IP layer.
IPv6 header is designed to optimize
software implementation
But does not solve the QoSproblem
completely
–Still under discussion
2
7中国电信集团公司（ China Telecom Corporation）
IPv6 Security support
AH and ESP extension header used with
IPsec
Built-in on IPv6
–Means any node can use it.
End-to-end network security (integrity,
authentication,confidentiality),
8中国电信集团公司（ China Telecom Corporation）
Mobility support
Built-in on IPv6
–indicates any node can use it
No foreign agent
Solve the problem of,triangle routing”in
mobile IPv4
Efficient routing means performance for
end-users.
Others...
9中国电信集团公司（ China Telecom Corporation）
The Challenges for IPv6
As a new technique,IPv6 is also market-
driven,
–IPv6 application is sparse,no specific
application which can only be based on IPv6,
–According to our estimation,the IPv4 address
will still be enough by the end of 2008.
–Current 3G deployment and NGN equipment is
mainly based on IPv4.
10中国电信集团公司（ China Telecom Corporation）
The works of China Telecom
Address application
Equipment test
IPv6 testbed
Technical Experiments
11中国电信集团公司（ China Telecom Corporation）
Address application
China Telecom filled the IPv6 allocation
request form and successfully received the
address block from APNIC in Sept,2002.
2001:0c68::/32
12中国电信集团公司（ China Telecom Corporation）
IPv6 testbed of China Telecom
China Telecom has built a IPv6 testbed in
Hunan for IPv6 network and service trial.
–Composed of equipments from GSR to Access
devices
–Interconnection with other IPv6 networks
–Access network:ADSL,LAN,WLAN,
–Provide access service to end users
3
13中国电信集团公司（ China Telecom Corporation）
Network topology
14中国电信集团公司（ China Telecom Corporation）
Service and Application
Currently,multiple services have been
supported by this network
–Web / VoIP / Streaming media/ Video
conferencing / PDA
–But these products and services are
experimental
15中国电信集团公司（ China Telecom Corporation）
Technical Experiments
In addition to Network experiment,China
Telecom also done some experiments
focused on specific IPv6 techniques,such as
–IPv6 in Broadband Access Network
–IPv4/IPv6 transition
–IPv6 Security
–IPv6 QoS
–IPv6 Application
16中国电信集团公司（ China Telecom Corporation）
Some Results
Current IPv6 deployment in ADSL scenario
are not mature,more work need to be done
to support more terminals over various
access networks.
Tunneling and double stack mechanism
have been widely supported in current IPv6
routers,but few BAS equipment support
IPv6,Automatic tunneling will be useful for
double stack user to visit IPv6 network.
17中国电信集团公司（ China Telecom Corporation）
Some Results
Some equipments have QoS functions
similar to IPv4,but whether IPv6 QoS
functions can meet future requirements is
still doubted.
IPv6 IPsec has been partly implemented in
Microsoft Windows and FreeBSD operating
system,but have not been widely supported
in Router equipments.
18中国电信集团公司（ China Telecom Corporation）
Some Results
Various IPv6 based applications products
has emerged,such as Web,VoIP,Video
conferencing,and Streaming media,But
there is still a great gap to transform these
applications into commercial services.
4
19中国电信集团公司（ China Telecom Corporation）
Further research
IPv6 Access solution
IPv4/IPv6 transition/Interconnection with
other networks
Business model
20中国电信集团公司（ China Telecom Corporation）
IPv6 Access solution
IPv6 solution in access network is very important,
which is the point that IPv6 will show its
advantages.
Multiple access solution will be designed,for
–there are Different access method,ADSL,LAN,
WLAN,3G,satellite,etc
– there are various user terminals,PC,mobile phone,
PDA,home devices,automobile,etc
The issues that should be addressed by each access
solution are address allocation,naming,AAA and
mobility.
21中国电信集团公司（ China Telecom Corporation）
IPv4/IPv6 transition
Applications and services is the engine of
IPv4/IPv6 transition.
Smooth transition maybe be only a dream.
Telecom operators should find a way to
integrate various transition techniques to
create a transition plan for future transition
Different operators have different transition
procedures due to the difference between
their networks.
22中国电信集团公司（ China Telecom Corporation）
Business model
Business model will be the most important
for IPv6 success,which is the drive for
IPv4/IPv6 transition.
The future IPv6 network will support more
wide variety of services than current IPv4
network.
Different IPv6 applications have different
business model,
23中国电信集团公司（ China Telecom Corporation）
Suggestions
Continues to research and doing experiment.
Emphasize the cooperation with other ISPs,
equipment vendors,universities and
research communities.
Focus on IPv6 application and service
development and business model.
24中国电信集团公司（ China Telecom Corporation）
THANK YOU ！
