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Re: ✘ntrip:// and tcp://

From: Gary E. Miller
Subject: Re: ✘ntrip:// and tcp://
Date: Sat, 16 Oct 2021 18:51:22 -0700

Yo Nick!

On Sat, 16 Oct 2021 11:46:26 +0100
Nick Taylor <> wrote:

> > Interesting.  But kplex is not in the Gentoo repository, and I
> > want to read from gpsd.  socat dies it fine:
> >
> > $ socat EXEC:'gpspipe -r' TCP-LISTEN:2948,reuseaddr,fork  
> Works great for me too - one of our guys found kplex but it's
> probably over complex for this simple application. Cheers for that
> guys!

I added socat examples to the gpspipe man page.  Othewrwise I'll forget.

> >> Then we can simulate different types of disconnects either by
> >> unplugging cable or using iptables to block comms out of the server
> >> running kplex  
> > iptables is pretty obsolete, netfilter is the way.  
> Good point - again one of our guys gave me an iptables command - more 
> learning :D

iptables is now just a shim over netfilter, so whatever works for you.

TBH, I have just been using the routing table.  To block conenctions

# ip route add blackhole

The to ubbloxk:

# ip route del blackhole

Of course that blocks everything to the host...

I remember that because that is how I blackhole abusive hosts attacking
my network.  It does leave dangling connects (SYN) so best not for
high traffic attacks.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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