Allow fe80:: range as a valid ipv6 gateway for public config

[coesensbert]

Description

Upon setting the public config of a node, allow fe80:: range as 'Gateway IPv6'. This can be a valid configuration if the local setup allows it. Example: fe80::1

Temporary workaround

ip netns exec public ip -6 route del default via 2a01:4f8:10a:710::1
ip netns exec public ip -6 route add default via fe80::1 dev public

[zaelgohary]

Should be done once threefoldtech/tfgrid-sdk-ts#1154 is merged.

[A-Harby]

I tried adding this configuration a couple of times but kept getting that error.

Validation was passing, but after clicking the save button, the error shows up.

[A-Harby]

Blocked on threefoldtech/tfgrid-sdk-ts#1618

[coesensbert]

There is (i believe on-chain?) validation of your added network metrics. Your config from the screenshot can never work. The ip is the same ip as the gateway.

Why you choose to test this specific address? It's already in use. If it's just for testing, make sure to remove those kinds of tests/configs once your done with them.

[A-Harby]

I tried different IPV4 only and it was successful

Then I tried the same with fe80::1 and failed.

It's probably from chain validation.

[A-Harby]

It appears to be from tfchain public IP validation.

[sameh-farouk]

I understand that this range is typically used inside an internal network for the router's link-local address and that it is a Valid IPv6 Default Gateway Address as OP stated. I am also aware that these addresses are valid only for communications on a local link (within a subnetwork that a host is connected to) and cannot route on the Internet.
So what is being asked here in this ticket conflicted with what was asked before in this one, which implicitly requires a GW address to be a public IP address (It requires the host IP address to be public and the GW address to be In the same subnet as the host IP address). So I can't implement this one without dropping part of what previously asked by @muhamadazmy
@muhamadazmy @xmonader can you comment here?

[sameh-farouk]

@delandtj Azamy request your comment. Can you check.