qr code c# tutorial Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunneling Teredo tunneling in Objective-C

Drawing Quick Response Code in Objective-C Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunneling Teredo tunneling

Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunneling Teredo tunneling
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NAT Proxying and Translation (NAT-PT)
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the former to the latter Table 24-2 briefly lists these Of these, the next two sections discuss dual stacking and manual tunneling, the two most common methods
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Routers running both IPv6 and IPv4 are referred to as being dual stacked Connecting IPv6 networks by
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tunneling it in IPv4 packets is referred to as 6to4 tunneling
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Dual Stacking In dual stacking, a device runs both protocol stacks: IPv4 and IPv6 Of all the transition methods, this is the most common one Dual stacking can be accomplished on the same interface or different interfaces of the device The top part of Figure 24-4 shows an example of dual stacking on a router, where NetworkA has a mixture of devices configured for the two different protocols, and the router configured in a dual stack mode Older IPv4-only applications can still work while
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Routing and IPv6
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FIGURE 24-4
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Dual stack NetworkA IPv4 and IPv6 RouterA IPv4 and IPv6 Host2: IPv6 IPv6-over-IPv4 tunneling IPv4 network NetworkB IPv4
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Dual stack and IPv6 tunneling
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Host1: IPv4
NetworkC IPv6
Host1 IPv6
RouterA
RouterB
Host2 IPv6
they are migrated to IPv6 by supporting newer APIs to handle IPv6 addresses and DNS lookups with IPv6 addresses The main disadvantage of dual stacking on a segment is that devices configured using only one stack must forward their traffic to a dual-stacked device, such as a router, which must then forward the traffic back to the same segment using the other stackThis is an inefficient use of bandwidth, but it does allow devices using both protocol stacks to coexist on the same network segment
IPv6 Tunneling IPv6 tunneling allows you to tunnel IPv6 packets by carrying them as payloads in an IPv4 packet, as shown at the bottom of Figure 24-4 Tunneling allows you to connect IPv6 networks together across an intermediate IPv4 network When tunneling IPv6 packets in an IPv4 payload, the IPv4 protocol field contains a value of 41, indicating that IPv6 tunneling is occurring The two routers performing the tunneling must be configured using dual stacking, since they need to communicate with both IPv6 and IPv4 devices on different segments If you are configuring the tunnel manually, you ll need to configure both the IPv4 and IPv6 addresses statically You ll also need to ensure that routing is performing normally to tunnel the IPv6 packets across the IPv4 network, as well as allowing the two IPv6 networks, as shown in Figure 24-4, to see each other s routes
24: IPv6
Cisco recommends against using IP unnumbered for the tunnel endpoints, since this can make it more difficult for you to troubleshoot problems when tunneling doesn t work
CERTIFICATION OBJECTIVE 2405
IPv6 Configuration
This section covers the basics of enabling IPv6 on your router, assigning IPv6 addresses to your interfaces, and enabling RIPng
Enabling IPv6 and Assigning Addresses
To use IPv6 on your router, you must, at a minimum, enable the protocol and assign IPv6 addresses to your interfaces, like this:
Router(config)# ipv6 unicast-routing Router(config)# interface type [slot_#/]port_# Router(config-if)# ipv6 address ipv6_address_prefix/prefix_length [eui-64]
The ipv6 unicast-routing command globally enables IPv6 and must be the first IPv6 command executed on the router The ipv6 address command assigns the prefix, the length, and the use of EUI-64 to assign the interface ID Optionally, you can omit the eui-64 parameter and configure the entire IPv6 address You can use the show ipv6 interface command to verify an interface s configuration Here s an example configuration, with its verification:
Router(config)# ipv6 unicast-routing Router(config)# interface fastethernet0/0 Router(config-if)# ipv6 address 2001:1cc1:dddd:2::/64 eui-64 Router(config-if)# end Router# show ipv6 interface fastethernet0/0 FastEthernet0/0 is administratively down, line protocol is down IPv6 is enabled, link-local address is FE80::207:EFF:FE46:4070 [TEN]
IPv6 Con guration
No Virtual link-local address(es): Global unicast address(es): 2001:1CC1:DDDD:2:207:EFF:FE46:4070, subnet is 2001:1CC1:DDDD:2::/64 [EUI/TEN] Joined group address(es): FF02::1 FF02::2
CertCam ON THE CD
2401The CD contains a multimedia demonstration of enabling IPv6 and configuring IPv6 on a router s interfaces To set up a static DNS resolution table on the router, use the ipv6 host command; you can also specify a DNS server with the ip name-server command:
Router(config)# ipv6 host hostname [port_#] ipv6_address1 [ipv6_address2 ] Router(config)# ip name-server DNS_server_IPv6_address
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