All rights reserved.BSCI 2 Học viện mạng Bách Khoa - www.bkacad.com Objectives Integration and coexistence strategies presented in this chapter are divided into three classes: –Dual
Trang 1IPv6 Integration and Coexistence
Strategies
and Coexistence
Strategies
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Objectives
Integration and coexistence strategies presented in
this chapter are divided into three classes:
–Dual stack –Tunneling –Protocol translation
Trang 3Dual Stack
Trang 4© 2008 Cisco Systems, Inc All rights reserved.
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Cisco IOS Software Is IPV6-Ready:
Cisco IOS Dual Stack
this interface is dual-stacked.
Trang 5Dual Stack
Trang 6© 2008 Cisco Systems, Inc All rights reserved.
Trang 7Querying the Naming Service for an IPv6
Address
Trang 8© 2008 Cisco Systems, Inc All rights reserved.
Trang 9Dual Stack
The following is a list of applications that have dual -stack support
on the Cisco IOS Software:
–DNS resolver— The DNS resolver on the Cisco IOS Software may resolve host names into IPv4 or IPv6 addresses The DNS resolver on Cisco can be configured to reach naming services over IPv4 and IPv6 using the ip name-server ipv6-address
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Tunneling IPv6 Packets Over Existing
IPv4 Networks
The tunnel is deployed between two islands made up of IPv6
nodes over an IPv4-only network such as the Internet Edgerouters at the border of the IPv6 islands and the Internet canhandle the tunneling of IPv6 packets in IPv4
As described in RFC 2893, IPv6 Transi tion Mechanisms, the
protocol number assigned to the encapsulation of IPv6 packets
in IPv4 is 41
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Trang 11Deploying Tunnels
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Deploying the IPv6 Manually Configured
Tunnels
Router(config)#ipv6 route ipv6-prefix/prefix-length
interface-type interface-number
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Trang 13GRE/IPv4 Tunnel Support for IPv6 Traffic
well -known standardized tunnel technique that can ensure stable and secure point-to-point links
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Deploying 6to4
via IPv4 Clouds, here are the main characteristics of the 6to4 mechanism:
–6to4 prefixes are all based on the 2002: :/16 address space assigned by the IANA
–Each 6to4 site uses at least one global ly unicast IPv4 address assigned on a 6to4 router The final representation is 2002:
ipv4-address: : /48
– Each 6to4 site gets one /48 prefix based on its global ly unicast IPv4 addressing
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Trang 15Deploying 6to4
Trang 16© 2008 Cisco Systems, Inc All rights reserved.
Trang 17S0/0/0 172.16.12.2 /24
S0/0/1 172.16.23.2 /24
172.16.23.1 /24
S0/0/1
R1
R1(config-if)# interface tunnel 0
R1(config-if)# tunnel mode ipv6ip to 6to4
R1(config-if)# ipv6 address 2002:AC10:0C01:1::1/64
R1(config-if)# tunnel source s0/0/0
Exit
R1(config)# ipv6 route 2002::/16 tunnel 0
R3 R3(config-if)# interface tunnel 0 R3(config-if)# tunnel mode ipv6ip to 6to4 R3(config-if)# ipv6 address 2002:AC10:1703:1::3/64 R3(config-if)# tunnel source s0/0/1
Exit R3(config)# ipv6 route 2002::/16 tunnel 0
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Using 6to4 Relay
However, other aggregatable global unicast prefixes are used on
the IPv6 Internet such as 2001: : /16 (Production IPv6 Internet) and3ffe: : /16 (the 6bone)
Therefore, all these prefixes other than 2002: : /16 are
unreachable unless one of the 6to4 routers on the IPv4 Internet offers to act as a gateway to forward the 6to4 traffic to the IPv6 Internet
A 6to4 router providing traffic forwarding to the IPv6 Internet is
called a 6to4 relay
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Trang 19Finding a 6to4 Relay on the Internet
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Deploying ISATAP Tunnels
are as follows:
– Automatic tunneling— The tunneling is automatic, meaningthat there is no need to apply manual configurations on hostswhen ISATAP support is enabled
–Prefix— Represents the high-order 64-bit of the IPv6 address
One aggregatable global or site-local /64 prefix must beassigned for the ISATAP operation within the site
–Interface ID— Represents the low-order 64-bit of the IPv6address assigned to the ISATAP host
EUI-64 = 0000 (16 bits) + 5EFE (16 bits) + IPv4 Address (32 bits).
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Trang 21Deploying ISATAP Tunnels
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Translation – NAT-PT
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mechanism that sits between an IPv6 network and an IPv4 network
into IPv4 packets and vice versa.
Trang 23Using NAT-PT
Network Address Translation Protocol Translation, NAT-PT is a
type of NAT that translates IPv6 addresses into IPv4 addressesand vice versa
Trang 24© 2006 Cisco Systems, Inc All rights reserved Cisco Public BSCI Module 8
Trang 25–http://cisco.com/application/pdf/en/us/guest/tech/tk872/c1550/cdccont_0900aecd8026003d.pdf
–http://cisco.com/en/US/partner/tech/tk872/technologies_white_
paper0900aecd8054d37d.shtml
–http://cisco.com/application/pdf/en/us/guest/tech/tk872/c1482/cdccont_0900aecd80260042.pdf
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