Portal Network integration tracking

[GrapeBaBa]

Rationale

This is a sub task of #30908 , it will track all the portal network integration works.

Implementation

This is the current fork diff, we will make the smallest changes for geth.

• NAT stun
• discv5 whoareyou challenge
• expose discv5 func
• add a nodes cache
• no resp v5 call
• make discv5 resp timeout configurable
• portal hive test multicast address (may not need change in geth)

[KolbyML]

#30581 @KolbyML will make a spec PR.

I was referring to what I would do if I was you,

#30581 (comment)

Hmm. We have an explicit test that verifies the current Geth behavior, the node is supposed to respond to every handshake attempt with a new WHOAREYOU challenge.

This is also explicitly mentioned by the spec, in the Handshake Implementation Considerations section (sentence beginning with "Another important issue is the processing...")

I'm curious if this happens often. Possibly we could change the spec.

I was agreeing with this ^. I don't have time to make a PR to update that spec at the moment, currently my focus is benchmarking trin

[GrapeBaBa]

@KolbyML Got it. Here I need to confirm if you agree with the current behavior in spec? Do we need other implementations (rust, nim) to modify according to the spec?