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IPv6 with SIT tunnel

As I had an incident I cleaned out my ESXi machine and installed the lab a new. With R80.20 On SmartCenter and Gateway this time.

Now I am in the process of adding IPv6 to it.

And this seems to be challenging.

The Colo offers a /64 subnet but just that. So it only works on the outside and I need to NAT IPv6 (yuk) if I want to use it.

More troublesome is that the IPv6 default gateway is not part of the local subnet. And I have no way to make it work in IPv6. I sort of get it to work on Ipv4 but it is a kludge.

See also: https://docs.ovh.com/gb/en/dedicated/network-ipaliasing/

and https://docs.ovh.com/gb/en/dedicated/network-ipv6/ 

So the next best thing is to setup a network with a HE ipv6 tunnel but there is a catch in GAIA. Make sure you fill in a reasonable big number in the TTL field. I used 8 and it wasn't enough. It turned out that I had 9 hops to the other end of the tunnel so the packets never made it. So I went for 16 instead.

So I have IPv6 connectivity on the firewall. Now the next order of business is to educate all my other devices in the lab about their IPv6 connectivity and see much trouble I get.

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2 Replies
Admin
Admin

Re: IPv6 with SIT tunnel

So you have your gateway getting IPv6 via he.net and a tunnel?

Will have to try that myself.

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Admin
Admin

Re: IPv6 with SIT tunnel

I had not planned to go down this route, but for similar reasons to you, I ended up doing so. 

Wasn't too difficult to set up, but I had an extra firewall to configure policy-wise.

Fortunately, I know the guy who's in charge of it Smiley Happy

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