Telstra is working to fully deploy IPv6 in its mobile network and telco cloud. So far it has enabled IPv6 on most major content providers and its mobile network. However, challenges remain around complexity in the network from value added services, network function virtualization, and the need for IPv6 support across the network underlay and overlay. Telstra's goal is the full removal of IPv4 from its network and enabling of IPv6 across all network domains including transport and fog computing as 5G networks require. There is still a long journey ahead to fully realize an IPv6-enabled mobile network and telco cloud.

1. Telstra Unrestricted Copyright Telstra©
IPv6 in the Telco Cloud
APNIC 44 – September 2017

2. Sunny Yeung
Senior Technology Specialist, Telstra Wireless Network Engineering
Sunny.Yeung@team.telstra.com
Technical lead for
Wireless IPv6 deployment
Wireless Mobile Edge and Telco Cloud IP Architecture
Introduction
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3. What does a IPv6 Mobile Network look like?
Where are we at with deployment?
What challenges lies ahead? Where else do we need to consider IPv6?
Executive Summary
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4. Telstra Unrestricted Copyright Telstra©
IPv6 for a Mobile Network
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5. As IPv4 addresses deplete, it will be more expensive to extend IPv4
resources
Dual-Stack is an effective transition technology but does not solve the
IPv4 depletion problem
Introducing IPv6:
• Reduced dependency on NAT
• Remove the need for regionalisation
• Pushes applications to move to IPv6
IPv6 for a Mobile Network
Why?
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6. IPv6 for a Mobile Network
Traffic Flow
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IPv4 Public Internet
Carrier Network
(IPv4 + IPv6)
IPv6 Public InternetIBR
NAT64
Public IPv6 to Public IPv4
Native IPv6
Radio Network
(IPv4 transport)
EPG
Single – Bearer
IPv6 only user plane
IPv6

7. Two existing APNs – one for Handsets, one for Mobile Broadband and Tethering
or
464XLAT + NAT64 + DNS64 for the Handset APN only
IPv6 enabled DNS for all other APNs
IPv6 for a Mobile Network
Different APNs for different purposes
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Telstra.WAP
Telstra.Internet
NAT64/
DNS64
464XLAT Internet
DNS-DS/
NAT44
Internet

8. Telstra Unrestricted Copyright Telstra©
What have we achieved so far?
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9. Most major content providers are providing IPv6 reachability
Some providers have mandated IPv6 support in their app stores and all
new apps must support native IPv6
Networks are evolving to support new IPv6 connections – SS or DS
Devices are beginning to support IPv6 natively
What have we achieved so far?
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10. What have we achieved so far?
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Source - https://www.google.com/intl/en/ipv6/statistics.html

11. So what is there left to do?
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Complexity in the network
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13. Value Added Services or packet processing requires manual steps today
Each path may require a unique VPN or PBR to define its path. The more
services, the more convoluted this becomes.
Complexity in the network
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InternetMobile Network
PGW
FW
Video
Optimizer
Parental
Control
Border Router

14. Complexity in the network
Network Function Virtualization
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Virtualisation may reduce the cost
of such network functions, but does
not necessarily reduce the network
complexity
Each path may require a unique
VPN or PBR to define its path. The
more services, the more convoluted
this becomes.
vFW
vVideo
Optimizer
vParental
Control
vPGW
Internet ProviderMobile Network
PE
Leaf
BR
vCGN
Leaf
Spine Spine

15. Complexity in the network
SDN only solves one of many problems
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Software-Defined Network means
many different things to many
people.
Service Function Chaining is the
equivalent of PBR for SDN.
1. Identify the user
2. Allocate a service chain to the
user according to their
subscription
3. Program the network to direct
the packets of this user to the
appropriate VNFs
vFW
vVideo
Optimizer
vParental
Control
vPGW
Internet ProviderMobile Network
PE
Leaf
BR
vCGN
Leaf
Spine Spine
If Service A
then vFW
then vCGN
then Internet
If Service B
then vFW
then vParental Control
then vCGN
then Internet
If Service C
then vVideo Optimizer
then vParental Control
then vCGN
then Internet
Openflow
Switch

16. Let’s dive deeper…
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17. Complexity in the network
Underlay and Overlay
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Underlay can be IPv4 only. But why?
Can we do Point-to-Point /127 and do
away with IPv4 altogether?
Is VXLAN over EVPN the best solution
for a Telco Cloud? What about service
chaining?
This should all be contained within a
single AS. What routing protocol is run
between VTEPs?
If this is entirely IPv6, can we leverage
Segment Routing for SDN control?vFW
vVideo
Optimizer
vParental
Control
vPGW
Internet ProviderMobile Network
PE
Leaf
BR
vCGN
Leaf
Spine Spine
SR?

18. Complexity in the network
Underlay and Overlay
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Openstack is somewhat ready for IPv6
– neutron supports IPv6 subnets and
DHCPv6, as well as SLAAC
You can begin to onboard tenants that
can be IPv6 enabled.
Really there is only two options –
Dual-Stack everything, or Conditional
Dual-Stack.
API endpoints
Databases
Automation
Interfaces
IPv4/IPv6
IPv4/IPv6
IPv4/IPv6
IPv4/IPv6

19. Does not support the use of an external IPAM module for IPv6 to allocate
the subnet.
OVS tunnel types do not support IPv6 endpoints until OVS 2.6.0+
Single-stack IPv6 tenant networking not fully available.
VPN support not good until at least Kilo.
NAT on OvS for IPv4.
Complexity in the network
Openstack does not fully support IPv6
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20. Telstra Unrestricted Copyright Telstra©
Fog and Transport
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21. Fog
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5G requires super low latency
depending on the network slice
required and the application behind it.
At some point, we must move the
cloud even closer to the user
Telco Cloud:
1. Service Functions in VNFs
2. Virtualised Packet Core Nodes
3. Media Cache
4. Value Added Services
Transit Provider Content Provider
MPLS Core
Internet
Aggregation
PE
Border Router
Roaming Gateway
CRAN
Telco
Cloud

22. Transport
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IPv6 SS for transport layer ? (6PE)
SRIPv6 to replace traditional
MPLS?
6VPE required to ensure services
provided by different VPNs have
IPv6 support
Transit Provider Content Provider
MPLS Core
Internet
Aggregation
PE
Border Router
Roaming Gateway
CRAN
Telco
Cloud

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What is our goal?
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24. The full removal of IPv4 private and public addressing from the entire
network
Enable NAT translations for only what is necessary
IPv4aaS
What is our goal?
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25. There is a long journey yet for IPv6, this is just the start…
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26. Telstra Unrestricted Copyright Telstra©
Thanks!
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