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Planning for IPv6 Migration
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Step 7: Migrating from ISaTap to Native Ipv6
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Finally, when all your network infrastructure devices support IPv6, you can begin to decommission your ISATAP routers because you no longer need them . Whether you will also migrate your infrastructure and hosts to support only pure-IPv6 is a decision best left for the distant future . diReCt FRoM tHe SoURCe
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Tips and Tricks for Transitioning from IPv4 to IPv6
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Mike Owen, Network Engineer
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hen transitioning a network from Ipv4-only to dual stack, there are several areas that need special attention.
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This is actually one area that gets easier with Ipv6 due to the huge address space that it offers. In general, you will want to add to each individual network segment a single Ipv6 /64 prefix, even in cases in which you have more than one Ipv4 subnet assigned to the same network (for example, by using the secondary keyword on Cisco routers). You should not need to use unique local addresses, even for lab networks. One exception might be that you do not want to use a routable /64 prefix for a segment that is not connected to your organization s globally routable space (that is, it is physically separate).
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Firewalls
Deploying Ipv6 can present issues for an organization s security team. Because Ipsec services are available in all Ipv6 stacks, it is more common to see end-to-end security implemented with Ipv6-enabled desktops. When faced with end-to-end encryption, a firewall administrator has one of two choices: Either deny the traffic and drop it at the perimeter or allow it through unchecked, thus bypassing the access control lists (aCLs) and other security enabled on the firewall. Note that this problem exists even with Ipv6-enabled firewalls.
Tunneling Technologies
Many transition technologies, such as ISaTap, 6to4, and manually configured Ipv6-in-Ipv4 tunnels, encapsulate Ipv6 packets inside Ipv4 to transport them across an Ipv4-only part of your network. These packets are identified by the use of Ip protocol 41 in the encapsulating packet. If firewalls, aCLs, or other devices in your network are not configured to forward these packets, then communications using these technologies will break. Many home routers, for example, are configured by default to only forward UDp and TCp protocols.
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Deploying IPv6
Here s a real-life example: after configuring a router to provide Ipv6 services at an IaNa meeting in Florida, Ipv6 connectivity was not working. after some troubleshooting with the service provider, I determined that their router was dropping Ip protocol 41, thus preventing Ipv6 connectivity across the service provider s Ipv4only network.
Network Applications
When deciding to Ipv6-enable an existing workflow or application, make sure to consider all parts of the process. For example, while upgrading a Web front end to support Ipv6, don t forget to enable the separate file store and back-end database servers as well, otherwise the workflow may appear to support Ipv6 from the front end but actually will not be completely tested.
Many DNS products today support the aaaa records which are used to store nameto-address mappings for Ipv6 end systems. However, that does not mean that they support Ipv6 lookups against the database in some cases, this functionality must be enabled through a configuration setting or an upgrade to the product itself. This is another part of an end-to-end Ipv6 workflow that needs to be considered.
Address Management
a simple way to enable Ipv6 autoconfiguration on your hosts is to configure your edge routers to advertise an Ipv6 prefix via Router advertisements. This enables Ipv6-enabled operating systems, including Windows Vista, Windows Server 2008, and Windows 7, to configure themselves with an Ipv6 address. This method of configuration is considered stateless because the router will not track which Ipv6 addresses are configured on which end system. When performing address auditing against these systems (to investigate a security incident, for example), it is impossible to determine which host was assigned a given Ipv6 address at a particular time. at best, if you are lucky, the router s aRp tables will contain the necessary information, but more often than not, you will be unable to track a specific Ipv6 address to the host on which it was configured. Here s a real-life example: at a previous job, I was contacted by the local office of the U.S. Secret Service to investigate a threat made against a government official. I was able to track the Ipv4 address that they provided to a high school in the school district where I worked and to a specific classroom at a certain time, based on DHCp logs and switch CaM tables. a student was subsequently identified as being in the classroom alone at the time and admitted to sending the messages, which turned out to be a hoax. Tracking down autoconfigured Ipv6 addresses at this level of detail is nearly impossible.
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