Brandon Nielsen wrote: > If the DNS servers provided by DHCP are trusted, why > would any plain NTP servers also provided by DHCP not be trusted? I can > do nefarious things with either. For DNS the solution is to not trust the DHCP-provided resolvers but validate DNSsec locally. A valid chain of DNSsec signatures tells you that the DNS record is authentic regardless of what servers it passed through on its way to you. Then you can use a DHCP-provided resolver without trusting it because the only nefarious thing it can do is to refuse to resolve a name for you, which just makes it a broken resolver. A similar approach for NTP would be if the stratum-1 servers would sign timestamps that secondary servers would cache and forward to clients, but caching timestamps doesn't work because the nature of a clock is that the time changes all the time. Thus I don't see how you can get out of trusting the NTP servers you use. Fedora's defaults should be chosen to keep users reasonably secure every way we can. If you as a sysadmin trust the DHCP server and every other device on the local network – including any device that may be connected in the future – then you should have the option to configure the system to trust DHCP-provided NTP and DNS servers. Björn Persson
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