[time-nuts] SLIP vs Ethernet for NTP
phk at phk.freebsd.dk
Sun Oct 23 13:15:29 UTC 2011
In message <4EA411F5.1030303 at rubidium.dyndns.org>, Magnus Danielson writes:
>On 10/23/2011 02:37 PM, Tijd Dingen wrote:
>The danger of Ethernet is that it has high capacity and a interconnect
>friendly interface. Thus, you might feel inclined to toss data over it
>carlessly causing packet delays and you can hook it into a switch and
>get delays and packet losses there.
I usually cure that by using fiber-based ethernet, which leaves a lot
less to plug it into. Also firewall rules preventing anything but
port 123 packets helps a lot.
RS-232 has surprisingly bad jitter.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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