Curl with ipv6 not working by default

Question

I am trying to curl ipv6 adresses, but without success.

If i try lets say:

curl https://google.com

I wait for a timeout and get network unreachable

If i force ipv4, everything is fine.

curl -4 https://google.com

Then again if i force ipv6, like this:

curl -6 https://google.com

i get:

curl: (7) Failed to connect to 2800:3f0:4001:806::1005: Network is unreachable

I suppose it has to do somehow with resolving ipv6 adresses.

I saw that on other computers that have a newer version of some linux distro, these requests go fine, so i'm guessing it has to do something with me using ubuntu 10.10, where this problem isn't solved.

I want to be able to curl normally without using the option: -4, what do i have to modify to be able to use curl normally with ipv6 adresses?

Answer 1

I have tried connecting to other networks and it worked.

In the mean time i updated my OS to MINT v15 and the problem still stayed.

Actually it even got weirder cause i could curl once, everything would be okay, than i would do it the second time and it would present the same old error.

At last i called my ISP and they set my modem to factory settings and updated the software.

Now everything seems to work fine.

Answer 2

If anybody finds this on Google like I did, to fix the issue I just had to tweak my firewall rules for IPv6.

By default I'd blocked everything on the incoming chain - after I added rules to allow established connections, ping requests and anything from localhost IPv6 connections started working!