FPT Telecom has deployed IPv6 throughout its core network, broadband network gateway (BNG), and customer premise equipment (CPE). At the BNG, IPv6 was deployed by combining the BNG with a DHCPv6 server. Over 818,000 IPv6 subscribers have been onboarded, accounting for 24.3% of FPT Telecom's total subscribers. Case studies examined issues with generating unique DHCP client identifiers and methods for selectively deploying IPv6 to only CPE devices ready to support it.

1. The Story of IPv6 at FPT Telecom
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Dat Nguyen Thanh – FPT Telecom
datnt11@fpt.com.vn

2. TABLE OF CONTENTS:
FPT TELECOM OVERVIEW
DEPLOYIPv6INCORENETWORK
DEPLOYIPv6ATBNG(BROADBANDNETWORKGATEWAY)
DEPLOYIPv6 ATCPE (CUSTOMERPROVIDEDEQUIPMENT)
RESULTS
CASES STUDY
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3. FPT TELECOM OVERVIEW
1,6 million broadband subscribers.
Services:
• High-speed Internet access
• IPLC
• VoIP
• IPTV
• Cloud
• OTT Services
• IoT products
3
NO.1 STORAGE
SERVICES IN VIETNAM
NO.2 ISP IN CAMBODIA
TOP 3 ISP IN VIETNAM
Website: www.fpt.vn

4. CE
v6
CE
v6
DEPLOY IPv6 IN CORE NETWORK
P P
P
P
PE
PE
PE
CE
v4
CE
v4
CE
v4
PE
CE
v4
IPv4 MPLS
6PE
6PE
6PE
6PE
Dual-Stack Router
Dual-Stack Router
CE
v4v6
CE
v4v6
4
iBGP/MBGP session

5. DEPLOY IPv6 IN BNG
5
PPPoE Exchange
Access Request
Access Accept
PPP IPCP
CPE BNG
RADIUS and DHCP SERVER
DHCP SOLICIT
RELAY-FORWARD (DHCP SOLICIT)
RELAY-REPLY (DHCP ADVERTISE)DHCP ADVERTISE
DHCP REQUEST
RELAY-FORWARD (DHCP REQUEST)
RELAY-REPLY (DHCP REPLY)
DHCP REPLY
Accounting Interim
DUALSTACK-OPEN
PPPoE LCP
PPP IPv6CP
Access Request
IPCP Open
IPv4 and IPv6 Data traffic can flow through session
IPv4 Data traffic can flow through session
Complicated at radius
Delay with dhcp
reply agent
model!!!

6. DEPLOY IPv6 IN BNG
PPPoE Exchange
Access Request
Access Accept
PPP IPCP
CPE RADIUS
BNG and DHCP SERVER
DHCP SOLICIT
DHCP ADVERTISE
DHCP REQUEST
DHCP REPLY
Accounting Interim
DUALSTACK-OPEN
PPPoE LCP
PPP IPv6CP
Access Request
IPCP Open
IPv4 and IPv6 Data traffic can flow through session
IPv4 Data traffic can flow through session
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Combine BNG with
DHCPv6 server

7. DEPLOY IPv6 AT CPEDevices inside CPE receives
IPv6 LAN from CPE via
DHCPv6 PD or ND/RA
BNG
ACCESS NETWORK
CPE
VLAN
WAN Link addrerss
using ND/RA
DHCPv6 prefix delegation
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8. RESULTS
818k
IPv6 subscribers
~477Gbps
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9. RESULTS
IPv6 deployment : 24.30%
(16th/240 entries)
(World IPv6 Launch measurement at 11th Jan 2017) 9

10. CASE STUDY:
DHCP Unique Indentifier
(DUID)
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11. CASE STUDY: DHCPv6 DUID
q Clients use DHCP Unique Indentifier (DUID) in Solicit message to get
an IP address from a DHCPv6 server
q Server compares DUID with its database and delivers configuration
data (address, lease times, DNS serviers,…) to client
q Thress types:
Ø LLT: Link-layer address + time
Ø EN: Vendor-assigned unique ID based on Enterprise number
q DUID must be globally unique!!!
Ø LL: Link-layer address
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12. PPPoE Exchange
Access Request
Access Accept
PPP IPCP
CPE RADIUS
BNG and DHCP SERVER
DHCP SOLICIT
DHCP ADVERTISE
DHCP REQUEST
DHCP REPLY
Accounting Interim
DUALSTACK-OPEN
PPPoE LCP
PPP IPv6CP
Access Request
IPCP Open
IPv4 and IPv6 Data traffic can flow through session
IPv4 Data traffic can flow through session
CASE STUDY: DHCPv6 DUID
A DHCPv6 client sends a
Solicit message in order to
locate DHCPv6 servers.
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13. CASE STUDY: DHCPv6 DUID
DHCPv6 Unique Indentifier (DUID)
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14. CASE STUDY: DHCPv6 DUID
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15. CASE STUDY : DHCPv6 DUID
à The CPE’s vendor must fix DUID generate process
Same DUID!!!! -- > Only 1 CPE
receive DHCPv6 PD
ACCESS NETWORK
DHCPv6 Server
CPE A
CPE B
Link-layer address:
aabb:ccdd:eeff
DUID:
00030001aabb3561eeff
Link-layer address:
aabb:xxyy:eeff
DUID:
00030001aabb3561eeff
By default, the DHCPv6 server will replace the
existing client entry (CPE A) with a new entry (CPE B)
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16. CASE STUDY:
Deploy IPv6 for selected CPE
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17. CASE STUDY: Deploy IPv6 for selected CPE
CPE C
CPE A
BNGCPE B
ACCESS NETWORKSAME
VLAN
NOT ready for IPv6
NOT ready for IPv6
Ready for IPv6
IPv4 Only
IPv4 and IPv6
How BNG know the
CPE is ready for IPv6
or not ???
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18. CASE STUDY: Deploy IPv6 for selected CPE
CPE BNG RADIUS
2 3
4
2, 3 – After finished PPPoE process (2), BNG send Access Request to
Radius (3). Subscriber’s username are included.
1 - By using TR069, Radius know CPE’s model, firmware version,
subscriber’s username configed on the CPE
4 – From the information at the 1st step, Radius send IPv4 or dual
IPv4/IPv6 dynamic profile to the BNG
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19. THANKS FORWATCHING
HAVEA NICEDAY
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