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systemdis currently the standard, and the service name and syntax to use are different there.systemdas init andsystemctl restart networkingworks too.nslookup my.domain.tldreturns the new IP address whileping my.domain.tldgoes to the old one. Restarting the networking service fixes this.init.dmechanism, but it is unlikely to survive long into the future.nslookupwill always bypass any local caches and will instead read/etc/resolv.confand automatically contact the nameserver(s) found in there directly (unless the command line includes a specific nameserver to query). On the other hand,pingwill always use the currently configured resolver, which may or may not include a caching feature.