On Fri, 20 May 2016, Jo-Philipp Wich wrote:
Hi Hans,
I wanted to preserve the ntp server behavior and only change the
behavior when configured in order to keep backwards compatibility. You
favour enabling DHCP ntp server config without explicit config ?
Personally I do because thats likely what most users expect, but then
trusting foreign NTP server advertisements might be a security sensitive
topic - on the other hand one trusts the default gateway and DNS
advertisements too, so I don't know.
NTP isn't signed.
If I can control your DNS, I can probably control your NTP by giving you the
wrong IP for the NTP server
If I can control your gateway, I can redirect all your NTP queries to someone
else (NAT, redirects, etc)
so why not trust the NTP server being provided?
David Lang
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