Links
Links to other networks. A link is an agreement between two administrators: neither end can carry traffic without a passphrase the other gave them.
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Reading this instance's links.
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Sign in as an administrator. A link names somebody else's server and whether their passphrase is working, which is theirs to disclose rather than ours.
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Configured links
Sent and received are counted separately because one is not evidence of the other. A link that has sent thousands of frames and received none is either working perfectly on a quiet network or unauthenticated at the far end, and no single number tells those apart. Rejected is the one to watch: a steady trickle almost always means the two ends disagree about the passphrase.
Offer a peering
A peering carries traffic between this network and another club's. Neither end can carry anything until both administrators hold the same passphrase, so this generates an offer, not a connection — nothing happens until the other operator accepts it and sends you their own details back. The passphrase is shown once here and is not stored anywhere you can read it again.
Generates an invitation to send the other administrator, and the passphrase behind it. They travel separately. The invitation is safe to email; the passphrase is not, and is shown here once.
Invitation — send this by email
Passphrase — send this another way
This passphrase is shown once and is not stored anywhere you can read it back. Send it over something you would send a password over, not the same email as the invitation.
Accept a peering
Paste what the other administrator sent you. Reading it shows who is asking and what they propose to exchange; nothing is written until you agree to it. The passphrase should have arrived by a different route from the invitation — if they came in the same email, ask for a new one.
Paste an invitation and the passphrase that came separately. Nothing is written until you confirm what it says.
Leave this empty when you are pasting a reply to an offer you made yourself — there is nothing to type, because your own server generated it.
Send this back to them
They paste this into their own Accept a peering box. They do not need the passphrase again — it is the one they sent you, and their server still has it.