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IPv6 in Linux

The purpose of this article is to discuss the basics of IPv6 implementation in Linux, and to draw a comparison between IPv6 and IPv4 implementations in Linux.

The main issue that IPv6 solves is the "shortage of addresses" problem. Instead of 232 possible address in IPv4, we have 2128 possible addresses in IPv6. This enlarges the address space significantly, probably far more than will be needed in the next few decades.

Such a large address space will eliminate NAT (network address translation) usage in many cases. This can be an advantage in many situations. For example, it makes end-to-end connectivity of VOIP and other applications simple.

Usually in IPv4, mobile devices are behind NAT. By eliminating NAT when using mobile devices in IPv6, we avoid the traffic of sending KEEP ALIVE messages, which are sent in order to keep the NAT state active. These messages are quite frequent. They are sent periodically every 40-120 seconds. NAT elimination for mobile devices in IPv6 reduces power consumption of these mobile devices, and as a consequence significantly improves their standby time. Sometimes, with mobile devices, each application may send its own keep alive messages, which only makes the problem worse.

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wacky - just plain wacky

atang1 wrote:
Routers are obsoleted long time ago, when computer systems had more than ten computers connected.

Tell that to Cisco, Juniper, Alcatel, Foundry, etc. All of which have routers that run at FULL line speed with 10GigE networks.

And then of course there are Carrier grade routers moving (and inspecting) packets even faster.

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