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On Sun, 22 Jan 2012, Julian Hall wrote:
On 22/01/2012 11:44, Gordon Henderson wrote:On Sun, 22 Jan 2012, Dan Dart wrote:And what will you do should you ever change ISP? You'll lose the IPv4 and IPv6 addresses you have and need to get new ones - there isn't any way right now to keep one for life without using a 3rd party tunnel/broker service...Get a real one from isp.
In a nutshell it's analogous to using an ISP email address? You can't take it with you to another ISP, so you're better off running your own domain (or using a webmail host) where the connectivity isn't related to the address so it will remain the same whatever Internet connection you have.
The issue with that (as I see it) is that you're doubling traffic over the Internet, or sending it via somewhat sub-optimal routes.
So say I use an IPv6 tunnel and the endpoint is in the UK... Data goes over my Internet line (via IPv4) to the endpoint when it's then routed (hopefully) native IPv6 to your chosen target. If the IPv6 tunnel service doesn't directly peer with the target then it might go a rather long way round. And what if the endpoint is in the US and you access a host in the UK... Data goes over your Internet line to the tunne endpoint US, back to the server in the UK, then the return data goes back to the US before coming back to you...
Geting native IPv6 is just the start - the next stage will be making sure the ISPs talk to each other and peer in the same way they currently peer for IPv4.
Heres an example:
From a server in Sheffield to a server in Telford:
IPv4: $ mtr -r -4 noc.enta.net HOST: dsr Loss% Snt Last Avg Best Wrst StDev 1. ge-1-3-0-32.shef1.as8553.net 0.0% 10 0.5 0.5 0.4 0.6 0.1 2. so-1-1-0-0.lon1.as8553.net 0.0% 10 6.8 7.0 6.8 7.4 0.2 3. lonap1.enta.net 0.0% 10 7.1 7.1 7.0 7.5 0.1 4. te5-3.telehouse-east2.core.e 0.0% 10 7.1 7.1 7.1 7.3 0.1 5. gi6-1.telford-dc1.core.enta. 0.0% 10 17.1 19.1 17.0 35.2 5.7 6. noc.enta.net 0.0% 10 17.2 17.2 17.0 17.6 0.2 IPv6: $ mtr -r -6 noc.enta.net HOST: dsr Loss% Snt Last Avg Best Wrst StDev 1. ge-1-3-0-32.shef1.ipv6.as855 0.0% 10 0.6 2.0 0.6 14.3 4.3 2. so-1-1-1-0.lon1.ipv6.as8553. 0.0% 10 6.9 7.0 6.9 7.3 0.1 3. 2001:978:2:21::11:1 0.0% 10 7.0 49.0 7.0 190.8 70.6 4. te3-2.ccr01.lon01.atlas.coge 0.0% 10 15.9 16.7 15.7 24.1 2.6 5. te0-2-0-4.ccr21.lon13.atlas. 0.0% 10 15.5 15.5 15.3 15.9 0.1 6. ::ffff:154.54.60.226 0.0% 10 15.5 15.5 15.4 15.8 0.1 7. te0-3-0-6.ccr21.par04.atlas. 0.0% 10 15.9 16.0 15.9 16.5 0.2 8. 2001:978:3::da 0.0% 10 15.7 17.9 15.7 37.2 6.8 9. if-ae2.2.tcore1.PYE-Paris.ip 0.0% 10 15.6 15.6 15.4 16.7 0.4 10. if-ae5.2.tcore1.L78-London.i 0.0% 10 15.8 15.8 15.7 16.1 0.1 11. if-5-0-0.mcore3.LDN-London.i 0.0% 10 15.9 15.8 15.6 16.1 0.1 12. 2001:5a0:c00:100::3e 0.0% 10 16.3 16.4 16.0 17.3 0.3 13. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 14. ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 15. 2001:4d48:1024:1024::1 0.0% 10 26.4 26.7 26.4 27.4 0.3 16. noc.enta.net 0.0% 10 26.5 26.6 26.4 26.9 0.1As you can see, the 2 ISPs peer with each other in IPv4 land, but not in IPv6 land - resulting in traffic going quite out of its way to get there. (and it looks like there's a bit of IPv4 in that route too - possibly an IPv6 tunnel over IPv4)
So getting there, but slowly... I think the "turn on and leave it on" in June this year will help to get the pace picked up a bit though.
Gordon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq