Network and Protocol Attacks

Nothing is broken. The service received well-formed requests and answered the address it was handed, exactly as specified, so the next release behaves identically. Only narrowing who may ask, or proving the asker's address, helps.

It depends on the stack. Against an unhardened receiver the reset is far cheaper: any in-window value, no plausible acknowledgement, no application meaning, and one hit ends everything. Against an RFC 5961 receiver a reset needs an exact sequence match, so in-window data becomes the easier landing.

The ones that turn borrowed access into owned access: changing the password, enrolling a factor, editing a recovery address, granting delegated administration. The gate caps how durable the access becomes, and denies nothing the identity can already read or send.

Agree only if remembered-identifier retention is extended to cover the whole window, because a window without matching memory is pure exposure. Price the extra storage, write the retention bound into the interface agreement, and keep partner test keys unacceptable in production.

It cannot. A client validates no server identity and takes the first acceptable answer, so a misplaced staging server and a hostile one are identical on the wire. Rogue is a claim about ownership, not about the packets.

A typo wins one connection from one host by accident. WPAD is asked for automatically by many hosts, and its answer is a configuration URL deciding where web traffic goes.

An adversary class predicts shape and duration, not capability. A publicity-driven crew needs a visible outage an outsider can verify inside a named window, so expect cheap held slots against a browser-loadable surface, and a stopping rule tied to attention.

Stop arguing it on altruism and name what you capture: your address space's reputation, recurring abuse-handling cost, peer and contract pressure, and the customer-to-customer forgery the same validation stops inside your own estate.

Treat the registrar account as a root of trust: registry-level change locks on load-bearing domains, phishing-resistant sign-in, a company-controlled recovery address, two-person approval. Win it by buying marketing a fast approval path.

Accountability belongs with whoever creates the record, enforced by making the record part of the resource's lifecycle. A central zone team can gate and expire records but cannot know when a resource dies, so pure centralisation fails.

Peak volume no longer indicates resources. Very large short bursts are rented cheaply from fleets somebody else built and holds, so the headline number describes the seller's stock. Duration and adaptation are what imply a budget.

Decide it as a cost case you cannot justify on your own harm, because you have none. Weigh donated transit and peer or contract exposure against support cost, then change the provisioning default first.

Spend unilateral hardening everywhere first because no peer has to agree to it, buy hop-count checking on every peer who will accept a change window, and reserve keyed per-segment authentication for the sessions whose loss actually hurts and where you control both ends.

Set a finite absolute lifetime and defend it: an unbounded one prices one acquired session at everything that identity reaches, forever. Spend your few prompts on operations that create durable access, and differentiate by population rather than by seniority.