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IPv6

  • 28-11-2011 2:42pm
    #1
    Hijpo
    Registered Users, Registered Users 2 Posts: 4,015 ✭✭✭


    What are your pros and cons to the big switch and what will it mean for home users having to understand a bit more about keeping there machines secure? I dont think simply installing a firewall and letting it do its bit will suffice.


Comments

  • #2
    FSL
    Registered Users, Registered Users 2 Posts: 1,456 ✭✭✭FSL


    Out of interest what is the basic difference between having a public IPv4 address, which may or may not be fixed and an IPv6 address?

    The IPv6 address will presumably be fixed.


  • #3
    Hijpo
    Registered Users, Registered Users 2 Posts: 4,015 ✭✭✭Hijpo


    FSL wrote: »
    Out of interest what is the basic difference between having a public IPv4 address, which may or may not be fixed and an IPv6 address?

    The IPv6 address will presumably be fixed.

    Also you wont use NAT on ipv6 so your actual ip is displayed on the internet.


  • #4
    brianwalshcork
    Registered Users, Registered Users 2 Posts: 611 ✭✭✭brianwalshcork


    Hijpo wrote: »
    Also you wont use NAT on ipv6 so your actual ip is displayed on the internet.

    This is going to cause a lot of problems if routers aren't properly configured, there's a lot of soft targets with ip6 enabled sitting behind hardened nat devices.


  • #5
    Cuddlesworth
    Registered Users, Registered Users 2 Posts: 14,012 ✭✭✭✭Cuddlesworth


    Hijpo wrote: »
    Also you wont use NAT on ipv6 so your actual ip is displayed on the internet.

    Where did you get that from? It's doubtful that home ISP's are going handing out loads of IPV6 addresses to each connection and device on their network. NAT simplifies routing, its not going anywhere. And IPV6 has its own private address range to accommodate it.


  • #6
    Hijpo
    Registered Users, Registered Users 2 Posts: 4,015 ✭✭✭Hijpo


    Cuddlesworth wrote: »
    Hijpo wrote: »
    Also you wont use NAT on ipv6 so your actual ip is displayed on the internet.

    Where did you get that from? It's doubtful that home ISP's are going handing out loads of IPV6 addresses to each connection and device on their network. NAT simplifies routing, its not going anywhere. And IPV6 has its own private address range to accommodate it.

    I was of the understanding ISPs only hand out your 64bit prefix's the rest is made up of your MAC by removing the dash, splitting it in half, adding fffe in the middle.
    You convert the second hex digit into binary, you take the 3rd binary digit and compliment it then convert back to hex. Put that value back in place of the hex digit you fiddled with. Break it into standard ipv6 format with colons and add it to the prefix passed down from your router.


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  • #7
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,552 Mod ✭✭✭✭Capt'n Midnight


    brianwalshcork wrote: »
    This is going to cause a lot of problems if routers aren't properly configured, there's a lot of soft targets with ip6 enabled sitting behind hardened nat devices.
    it's already caused problems with routers that don't understand IPv6 passing through the packets regardless since they couldn't check them


    have any of the big Irish ISP's even got plans to give IP6 to home users ?
    IIRC some plan to NAT all the way down


  • #8
    Hijpo
    Registered Users, Registered Users 2 Posts: 4,015 ✭✭✭Hijpo


    Capt'n Midnight wrote: »
    it's already caused problems with routers that don't understand IPv6 passing through the packets regardless since they couldn't check them


    have any of the big Irish ISP's even got plans to give IP6 to home users ?
    IIRC some plan to NAT all the way down

    Thats why protocols like 6in4 tunnels have been developed. I dont think any of the irish ISP's have even begun to think about the conversion to IPv6 seen as some rather optimistic companies going out of business has freed up huge chunks of addresses they'd hoarded (Nortel punted over 666,000 earlier in the year for around $11 per IP)
    In my view thats given irish ISP's some thinking time on how to adjust to the IPv6 roll out. I hope there not being the "typical irish" and not being proactive.


  • #9
    oscarBravo
    Technology & Internet Moderators Posts: 28,830 Mod ✭✭✭✭oscarBravo


    Cuddlesworth wrote: »
    It's doubtful that home ISP's are going handing out loads of IPV6 addresses to each connection and device on their network.
    Why not? It's not like there's a shortage of them.

    The most likely scenario for rolling out IPv6 is that each customer will get either a /48 or a /56 network allocated to them. That's either 256 or 65,536 /64 address blocks. The vast majority of customers will only need one /64, and nobody's going to need more than 65,536.

    There's no reason not to allocate all these addresses to a customer. The ISP will be allocating them from a /32 block, which means there are 65,536 /48s available to allocate, or 16,777,216 /56s. Finally, there are as many /32 blocks as there are IPv4 addresses.

    Like I say, no shortage.
    NAT simplifies routing...
    In what way? In my experience, NAT makes routing a bloody nightmare.
    Capt'n Midnight wrote: »
    have any of the big Irish ISP's even got plans to give IP6 to home users ?
    IIRC some plan to NAT all the way down
    I don't know about the big ones, but some of the smaller ones are already fully live and making it available. Airwire is a pioneer in this regard, and we (WestNet) are actively testing (I have IPv6 at home).

    The biggest challenge is the ability of retail-grade routers to support it. There are also questions about the capabilities of stateless autoconfig versus DHCP. These are issues that will be ironed out with use, though.
    Hijpo wrote: »
    Thats why protocols like 6in4 tunnels have been developed.
    I've been running a SixXS tunnel at home for three or four years now; I only turned it off at the weekend when I got the native v6 connection up and running. It's been pretty cool to see more and more traffic heading that way over those few years.
    I dont think any of the irish ISP's have even begun to think about the conversion to IPv6 seen as some rather optimistic companies going out of business has freed up huge chunks of addresses they'd hoarded (Nortel punted over 666,000 earlier in the year for around $11 per IP)
    In my view thats given irish ISP's some thinking time on how to adjust to the IPv6 roll out. I hope there not being the "typical irish" and not being proactive.
    There's no real time to buy. APNIC have issued their last v4 block; RIPE will run out this year. The only option is the move to v6, and I think there's finally the momentum to make it happen.

    In some respects the smaller ISPs will find it easier to make the switch - they can be more agile in terms of how they do things. The cable and DSL operators probably have their plans fairly well advanced, although they have a much bigger installed base of legacy equipment (in customers' homes) that will probably never handle v6.

    The mobile operators are probably kicking the can down the road and waiting for LTE, which should support v6 natively.


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