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How does IPv6 even work?

edfoxedfox Member
edited July 2017 in Help

Okay, so I was working on tidying up my servers and stuff when I decided to finally try out IPv6 on a couple of NAT servers. This way i can use my only IPv6+IPv4 server to proxy all the stuff from the servers and be a happy fox.

However, I'm so stupid that i can't even make two vpses ping each other.

I used netstat -A inet6 -rn to discover my external IPv6 addresses.

```ed@yiff:~$ netstat -A inet6 -rn
Kernel IPv6 routing table
Destination Next Hop Flag Met Ref Use If
fe80::/64 :: U 256 0 0 ens3
::/0 :: !n -1 1 68065 lo
::1/128 :: Un 0 2 478 lo
fe80::33ff:fef0:2081/128 :: Un 0 1 0 lo
ff00::/8 :: U 256 1255870 ens3
::/0 :: !n -1 1 68065 lo


Nice, it looks like we have an ip address. Let's fire up the other machine so we can ping the server.

ed@murr:~$ ping6 fe80::33ff:fef0:2081
connect: Invalid argument


Mkay. So I've read online a couple of pages to try to learn more about IPv6 and it looks like that the address i have is actually a whole subnet just for my vps!

http://www.gestioip.net/cgi-bin/subnet_calculator.cgi

Using this nice calculator i discover that i can use any address between fe80::33ff:fef0:2081:0 and fe80::33ff:fef0:2081:ffff!

```ed@murr:~$ ping6 fe80::33ff:fefe:3801::0
ping: fe80::33ff:fefe:3801::0: Name or service not known

Fuck. Now i'm stuck here. What am i doing wrong?

Comments

  • hzrhzr Member

    ifconfig -a | grep inet6

    Your "route" is ::/0.

  • IshaqIshaq Member

    That's the link local.

  • WSSWSS Member

    You are on a local link, dude..

  • edfoxedfox Member

    @hzr said:
    ifconfig -a | grep inet6

    inet6 fe80::33ff:fef0:2081/64 scope link

    @Ishaq said:
    That's the link local.

    Welp, don't make me feel more like a retard

  • MagicalTrainMagicalTrain Member

    fe80 is a link-local address. Its not your public IP.

    curl -6 icanhazip.com will tell you your public IP.

  • WSSWSS Member

    What OS/dhcp are you using? What provider?

  • IshaqIshaq Member
    edited July 2017

    @edfox said: Welp, don't make me feel more like a retard

    Everyone starts somewhere. What's the output of ifconfig

  • edfoxedfox Member

    @MagicalTrain said:
    curl -6 icanhazip.com will tell you your public IP.

    curl: (7) Couldn't connect to server on both my machines

    @WSS said:
    What OS/dhcp are you using? What provider?

    I'm using Debian Stretch/Testing, provider is Wishosting

  • IshaqIshaq Member

    I don't think a publicly routable IPv6 is configured on your system.

  • MagicalTrainMagicalTrain Member

    @edfox Then you dont have ipv6 working currently.

    I dont think wishosting actually does ipv6 on their nat servers. Or am I mistaken?

  • WSSWSS Member

    So. are you starting a dhcp daemon capable of taking an IPv6? What's your /etc/network/interfaces look like (even if it is deprecated)

  • edfoxedfox Member
    edited July 2017

    @MagicalTrain said:
    @edfox Then you dont have ipv6 working currently.

    I dont think wishosting actually does ipv6 on their nat servers. Or am I mistaken?

    I remember sending a ticket telling @exception0x876 that IPv6 didn't work properly and he fixed it in some way.

    @WSS said:
    So. are you starting a dhcp daemon capable of taking an IPv6? What's your /etc/network/interfaces look like (even if it is deprecated)

    ed@murr:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
  • DigitalJoseeDigitalJosee Member
    edited July 2017

    @MagicalTrain said:
    @edfox Then you dont have ipv6 working currently.

    I dont think wishosting actually does ipv6 on their nat servers. Or am I mistaken?

    My Wishosting NAT have IPv6 just fine, and I can see it using your curl command.

    Thanked by 1MagicalTrain
  • WSSWSS Member

    There's not a single ipv6 dhcp request in there.

    Add: iface eth0 inet6 dhcp

  • edfoxedfox Member

    @WSS said:
    There's not a single ipv6 dhcp request in there.

    Add: iface eth0 inet6 dhcp

    ed@murr:~$ sudo ifconfig [sudo] password for ed: eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.5.xxx netmask 255.255.255.0 broadcast 192.168.5.255 inet6 fe80::216:3cff:fe29:83eb prefixlen 64 scopeid 0x20<link> ether 00:16:3c:29:83:eb txqueuelen 1000 (Ethernet) RX packets 1974 bytes 154192 (150.5 KiB) RX errors 0 dropped 13 overruns 0 frame 0 TX packets 111 bytes 15849 (15.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    Done but nothing happened (i restarted network, and rebooted just to make sure)

  • DigitalJoseeDigitalJosee Member

    Is your IPv6 not working at all? Or you just can't find your address?
    Can you curl -6 google.com?

    On my Online.net dedi, I have no IPv6 connection at all, so curl -6 have no results.

  • WSSWSS Member

    Assuming that your route hasn't changed. I'd ask WIS to see if your MAC is even being vended an address. I'd try to be more helpful but I refuse to endure systemd without pay, so.. I'm outta.

  • EdmondEdmond Member

    @edfox said:

    @WSS said:
    There's not a single ipv6 dhcp request in there.

    Add: iface eth0 inet6 dhcp

    ed@murr:~$ sudo ifconfig [sudo] password for ed: eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.5.xxx netmask 255.255.255.0 broadcast 192.168.5.255 inet6 fe80::216:3cff:fe29:83eb prefixlen 64 scopeid 0x20<link> ether 00:16:3c:29:83:eb txqueuelen 1000 (Ethernet) RX packets 1974 bytes 154192 (150.5 KiB) RX errors 0 dropped 13 overruns 0 frame 0 TX packets 111 bytes 15849 (15.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    Done but nothing happened (i restarted network, and rebooted just to make sure)

    Do they even provide a IPv6 address? Only shows a local IPv6 address. Could set up a tunnel for it, but you should double check with your host.

  • rm_rm_ IPv6 Advocate, Veteran

    It's not necessarily so that you need to use DHCPv6 to obtain IPv6. It varies between hosts, and those requiring DHCPv6 are actually in a minority. Check with yours.

    And yes currently you do not have any global IPv6 on that machine.

  • edfoxedfox Member

    @DigitalJosee said:
    Is your IPv6 not working at all? Or you just can't find your address?
    Can you curl -6 google.com?

    On my Online.net dedi, I have no IPv6 connection at all, so curl -6 have no results.

    $ curl -6 google.com
curl: (7) Couldn't connect to server

    :(

  • IkoulaIkoula Member, Host Rep
    edited July 2017

    +1 Your hosting company must offers ipv6 on the service you're using to be able to set it up on your server.

    Thanked by 1Clouvider
  • JanevskiJanevski Member

    @edfox Pass https://ipv6.he.net/certification/ it's really fun and it teaches you while you learn.

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