IPv4/IPv6 Transition Mechanisms. Luka Koršič, Matjaž Straus Istenič
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1 IPv4/IPv6 Transition Mechanisms Luka Koršič, Matjaž Straus Istenič
2 IPv4/IPv6 Migration Both versions exist today simultaneously Dual-stack IPv4 and IPv6 protocol stack Address translation NAT44, LSN, NAT64 Tunneling IPv6 over IPv4 (RFC 2893) IPv6 over GRE (RFC 2473) IPv4-compatible addresses (RFC 2893) IPv6 address is calculated from IPv4 address (:: ) 6to4 (RFC 3056) 6rd IPv6 Rapid Deployment (RFC 5569) ISATAP (RFC 5214) Teredo NAT traversal (RFC 4380) MPLS 6PE (RFC 4798) 6VPE (RFC 4659) 2
3 Address Translation
4 Address Translation IPv4/IPv4 Address Translation Classic NAT/PAT NAT 44 (Large Scale NAT - LSN) NAT the whole access network is behind NAT NAT444 (LSN + NAT44) A+P (Address + Port) dynamic port sharing on the same IPv4 address IPv4/IPv6 Address Translation Enables communication between IPv4-only and IPv6-only devices NAT-PT (RFC 2766) deprecated NAT64 Framework for IPv4/IPv6 Translation (RFC 6144) IPv6 Addressing of IPv4/IPv6 Translators (RFC 6052) DNS64: DNS Extensions for Network Address Translation from IPv6 Clients to IPv4 Servers (RFC 6147) IP/ICMP Translation Algorithm (RFC 6145) 4
5 Stateless NAT64 Stateless no session preservation Algorythm for translating between IPv4 and IPv6 addresses Each IPv6 address is translated to exactly one IPv4 address Only IP and ICMP header is translated Direction of operation IPv6 è IPv4 internet IPv4 internet è IPv6 IPv6 è IPv4 IPv4 è IPv6 Header fields translation Addresses Hop Limit ó TTL Payload Length Header Length Total Length
6 Tunneling
7 Manual Tunneling RFC 2893 Transition Mechanisms for IPv6 Hosts and Routers interface tunnel 100 ipv6 address 201:300::1/64 (no) ipv6 nd ra suppress tunnel source tunnel destination tunnel mode ipv6ip interface tunnel 100 ipv6 address 201:300::2/64 (no) ipv6 nd ra suppress tunnel source tunnel destination tunnel mode ipv6ip 7
8 GRE Tunneling RFC 2473 Generic Packet Tunneling in IPv6 Specification GRE (Generic routing Encapsulation) interface tunnel 2002 ipv6 address 201:300::1/64 tunnel source e0/0 tunnel destination tunnel mode gre ip interface tunnel 2002 ipv6 address 201:300::2/64 tunnel source e0/0 tunnel destination tunnel mode gre ip 8
9 6to4 1/3 RFC 3056 Connection of IPv6 Domains via IPv4 Clouds Features Automatic tunnel provisioning IPv6 address is calculated from IPv4 (2002: ::/48) Public 6to4 anycast relay è 2002:c058:6301:: (RFC3068) Elements Hosts Routers Relays 9
10 6to4 2/3 Connecting remote IPv6 LANs interface tunnel 2002 ipv6 address 2002:c80f:0f01::1/128 tunnel source ethernet0/0 tunnel mode ipv6ip 6to4 interface ethernet 0/0 ip address interface ethernet 1/0 ipv6 address 2002:c80f:0f01:100::2/64 interface tunnel 2002 ipv6 address 2002:c80b:0b01::1/128 tunnel source ethernet0/0 tunnel mode ipv6ip 6to4 interface ethernet 0/0 ip address interface ethernet 1/0 ipv6 address 2002:c80b:0b01:100::2/64 10
11 6to4 3/3 IPv6 Internet Access CE and 6to4 Relay configuration interface tunnel 2002 ipv6 address 2002:c80f:0f01::1/128 tunnel source ethernet0/0 tunnel mode ipv6ip 6to4 interface ethernet 0/0 ip address interface ethernet 1/0 ipv6 address 2002:c80f:0f01:100::2/64 interface Loopback0 ip address ipv6 address 2002:c058:6301::1/128 interface tunnel 2002 ipv6 unnumbered Loopback0 tunnel source Loopback0 tunnel mode ipv6ip 6to4 ipv6 route 2002::/16 tunnel2002 ipv6 route 2002::/16 tunnel2002 ip route ::/0 2002:c058:6301::1 11
12 IPv6 Rapid Deployment (6rd) 1/4 RFC 5969 IPv6 Rapid Deployment on IPv4 Infrastructure (6rd) Protocol Specification Features Automatic tunnel provisioning ISP IPv6 address space IPv6-only access network Elements Hosts 6rd Customer Equipment (CE) 6rd Border router (BR) 12
13 IPv6 Rapid Deployment (6rd) 2/4 Connecting remote IPv6 LANs ipv6 general-prefix 6rd-prefix 6rd Tunnel 1 ipv6 unicast routing ipv6 cef interface Tunnel 1 ipv6 enable tunnel source Ethernet 1/0 tunnel mode ipv6ip 6rd tunnel 6rd prefix 2001:db8::/32 tunnel 6rd ipv4 prefix-len 16 interface Ethernet 0/0 description LAN1 ipv6 address 6rd-prefix ::1/64 interface Ethernet 1/0 description Towards LAN2 ip address 200:15:15: ipv6 route 2001:db8::/32 tunnel 1 13
14 IPv6 Rapid Deployment (6rd) 3/4 IPv6 Internet Access CE configuration ipv6 general-prefix 6rd-prefix 6rd Tunnel 1 ipv6 unicast routing Ipv6 cef Interface Tunnel 1 ipv6 enable tunnel source Ethernet 1/0 tunnel mode ipv6ip 6rd tunnel 6rd prefix 2001:db8::/32 tunnel 6rd ipv4 prefix-len 16 tunnel 6rd br interface Ethernet0/0 description Users ipv6 address 6rd-prefix ::1/64 interface Ethernet1/0 description ISP ip address ipv6 route 2001:db8::/32 tunnel1 ipv6 route ::/0 tunnel1 2001:db8:1:: 14
15 IPv6 Rapid Deployment (6rd) 4/4 IPv6 Internet Access 6rd BR Configuration ipv6 general-prefix 6rd-prefix 6rd Tunnel 1 ipv6 unicast routing Ipv6 cef Interface Tunnel 1 ipv6 enable tunnel source Loopback0 tunnel mode ipv6ip 6rd tunnel 6rd prefix 2001:db8::/32 tunnel 6rd ipv4 prefix-len 16 interface Ethernet0/0 description IPv6 Internet ipv6 address 2001:db9::1/64 interface Loopback0 description BR Address ip address ipv6 route 2001:db8::/32 tunnel1 ipv6 route ::/0 2001:db9::2 15
16 Teredo RFC 4380 Teredo: Tunneling IPv6 over UDP through Network Address Translations (NATs) Features NAT traversing Supported by default on Microsoft OS Slow UDP Elements Hosts/servers Relays Host-specific relays 16
17 ISATAP RFC 5214 Intra-Site Automation Tunnel Addressing Protocol (ISATAP) Features Corporate & academic environments Single administrative domain Elements Hosts Routers IPv6 Source IPv6 Destination fe80:5efe: fe80:5efe: IPv4 Source IPv4 Destination
18 6PE 1/2 RFC 4798 Configuring IPv6 Islands over IPv4 MPLS Using Provider Edge Routers Features Core remains IPv4 Edge devices (6PE) must support dual-stack IPv6 packets transported over LSP IPv4 Control plane (IGPv4, LDPv4, MP-BGP) Fast Re-Route (FRR), Traffic Engineering (TE) 18
19 6PE 2/2 Connecting remote LANs 6PE1 & 6PE2 Configuration ipv6 cef interface loopback0 ip address router bgp neighbor 2001:f00d:1::1 remote-as neighbor remote-as 100 neighbor update-source lo0 address-family ipv6 neighbor activate neighbor send-label ipv6 cef interface loopback0 ip address router bgp neighbor 2001:db8:1::1 remote-as neighbor remote-as 100 neighbor update-source lo0 address-family ipv6 neighbor activate neighbor send-label 19
20 6VPE 1/5 RFC 4659 BGP-MPLS IP Virtual Private Network (VPN) Extension for IPv6 VPN Features IPv6 VPN provisioning over IPv4/MPLS Edge devides (6VPE) must support dual-stack Same MPLS VPN features as for IPv4 VRF, RT, RD MP-NGP Mainly used in enterprises 20
21 6VPE 2/5 Connecting remote IPv6 VPN LANs CE1 configuration ipv6 unicast-routing ipv6 cef interface Ethernet0/0 description To the ISP ip address ipv6 address 2001:db8:cafe:1::1/64 interface Ethernet1/0 description ipv6vpn ip address ipv6 address 2001:db8:beef:1::1/64 ipv6 rip ipv6vpn enable router bgp 500 neighbor 2001:db8:cafe:1::2 remote-as 100 neighbor remote-as 100 address-family ipv4 redistribute eigrp 100 neighbor activate exit-address-family address-family ipv6 neighbor 2001:db8:cafe:1::2 activate redistribute rip ipv6vpn exit-address-family 21
22 6VPE 3/5 Connecting remote IPv6 VPN LANs 6VPE1 VRF configuration vrf definition ipv6vpn rd 200:1 address-family ipv4 route-target export 200:1 route-target import 200:1 exit-address-family address-family ipv6 route-target export 200:1 route-target import 200:1 exit-address-family 22
23 6VPE 4/5 Connecting remote IPv6 VPN LANs 6VPE1 Configuration ipv6 unicast-routing ipv6 cef interface Loopback0 ip address interface Ethernet0/0 description To the ipv6vpn on CE1 ip address ipv6 address 2001:db8:cafe:1::2/64 interface Ethernet2/0 description To the ISP ip address mpls ip router ospf 1 log-adjacency-changes redistribute connected subnets passive-interface Loopback0 network area 0 23
24 6VPE 5/5 Connecting remote IPv6 VPN LANs 6VPE1 BGP configuration router bgp 100 neighbor remote-as 100 neighbor update-source lo0 address-family ipv4 neighbor activate no auto-summary no synchronization exit-address-family address-family vpnv4 neighbor activate neighbor send-community ext exit-address-family address-family vpnv6 neighbor activate neighbor send-community ext exit-address-family address-family ipv4 vrf ipv6vpn redistribute connected neighbor remote-as 500 neighbor activate exit-address-family! address-family ipv6 vrf ipv6vpn neighbor 2001:db8:cafe:1::1 remote-as 500 neighbor 2001:db8:cafe:1::1 activate exit-address-family 24
25 Operator & ISP networks
26 Goal Native IPv6 Access Aggregation Core 26
27 Access 1/4 NAT 44 (Large Scale NAT) Holding on to IPv4 27
28 Access 2/4 NAT64 AFT Address Family Translation Stateless NAT64 Cisco 28
29 Access 3/4 6rd IPv6 Rapid Deployment Swiss Telecom (in production this year) 29
30 Access 4/4 DS-Lite Dual-Stack Lite NAT 44 A+P 30
31 Access - PPPoE 1/3 RFC 2472 IP version 6 over Point to Point Protocol (PPP) PPPoE PPP over Ethernet 31
32 Access - PPPoE 2/3 IPv6 over PPPoE CPE Lack of CPEs that support IPv6 over PPPoE Dual-stack IPv4/IPv6 Access and aggregation Core No upgrade required IPv4/IPv6 Addressing subscriber devices SLAAC (Stateless Address Autoconfiguration) DHCPv6-PD 32
33 Access - PPPoE 3/3 Basic authorization and DHCP-PD Source: Cisco 33
34 Access - IPv6oE 1/2 1:1 VLAN + DHCP-PD Source: Cisco 34
35 Access - IPv6oE 2/2 N:1 VLAN + DHCP-PD + AAA Source: Cisco 35
36 Cable Access IPv6 in cable networks exists for some time now Lack of IPv4 private address space IPv4 (big cable operators) DOCSIS 3.0 IPv6 on CM (Cable Modem) IPv6 on CMTS (Cable Modem Termination System) IPv6 on terminal devices Addressing SLAAC DHCPv6 36
37 Core 1/3 IPv4 Separated IPv6 network (new devices) IPv6 tunneling IPv6 over IPv4 (RFC 2893) GRE (RFC 2473) L2TPv3 Dual-stack core devices Careful planning with network resources! MPLS Native IPv6 MPLS Poor support IPv6 over AToM (Any Transport over MPLS) IPv6 provider edge router (6PE) over MPLS IPv6 VPN provider edge (6VPE) over MPLS 37
38 Core 2/3 IPv6 Provider Edge Router (6PE) over MPLS Edge devices (PE) are dual-stack, core remains IPv4/MPLS 38
39 Core3/3 IPv6 VPN provider edge (6VPE) over MPLS BGP/MPLS VPN + 6PE J Core remains IPv4/MPLS 39
40 Thank you!
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