Unfortunately malware tends to be the one kind of No-Ip client that actually has (lots of) redundancy built into its peer discovery mechanism. Malware authors

Unfortunately malware tends to be the one kind of No-Ip client that actually has (lots of) redundancy built into its peer discovery mechanism. Malware authors anticipate their communication channels to fail and usually account for it with a whole series of fallbacks. Quite unlike your NetGear or LinkSys home router, which many people suddenly can't reach anymore from e.g. their vacation home...