One might want remote access to a network, even if a "server" is not used. For example, I use a VPN, to connect to my local network. However, directly accessing computers on the local network gets messy, if only one IP is available and port forwarding has to be used. Since I added IPv6, I can now reach all my computers from elsewhere. I have 2^72 addresses available (that's a trillion times the entire world wide IPv4 internet) on my subnet. I have already used 6 of 'em! ;-)
I use a tunnel broker that provides an IPv6 /56 subnet using 6in4 tunneling (IP protocol 41). On my notebook computer, I also run a single address client that provides one IPv6 address. So, between the two, I can use IPv6 to reach my home computers. Even my Google Nexus One can use IPv6, when connected to my home WiFi.
I use the client software from http://gogonet.gogo6.com, but there are others, such as http://he.net. The client software I use is available for Linux, Windows, Mac, Unix etc.
You can also use WiFi routers, such as the D-Link DIR-825 to provide IPv6 via 6in4 tunnels.
I run the 2 IP cable modem to a 8 port 10/100 Switch, then out to a pair of Linksys Gig-E Wireless N routers, one is single band, the other dual band.
Turn of DHCP on 1 of them.
Set them both to the SAME subnet on the backside as in 192.168.0.X
And bridge them together as well to expand the port and out to a couple of Gig-e switches as well.
I have 2 public IP's.
One feeds a WHS2K3 and the feeds an SBS2K8
Give me remote access to either server.
Lets mail in to the SBS and remote to the WHS.
I sometimes balance all the lan clients to different gateways in case 1 router is saturated with P2P and BT stuff.
2 IPs are sweet!
Never had Shaw or the cable modem ISP reseller on my case for running servers.
I have a registered .CA domain that points to the SBS and the WHS uses the homeserver.com domain.
2nd ip is only really of any use to people using a switch instead of a router or if they are just switching the cat 5 from their pc to their xbox or whatever. For most users, it isn't really of much use. It won't improve speeds or change bandwidth.
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