[time-nuts] SLIP vs Ethernet for NTP

Poul-Henning Kamp 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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