News archive April 2014 - Koos van den Hout

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2014-04-29 My first succes in radio connection via amateur satellite 6 years ago
I made my first satellite QSO yesterday evening. I saw an upcoming SO-50 pass which was right overhead for me, northwest to southeast. This is the ideal direction for following a pass in the backyard. And there would also be a big overlap for when it would be in view from the Cambridge hams on Lewis Island, maidenhead locator IO68UL. That's a distance of around 1010 kilometers.

When I started to hear the satellite I heard some CQ's from different callsigns. I tried calling CQ myself once but heard no clear answer. The pass was reaching the zenith, the moment of the highest change in doppler shift. Then I heard GS3PYE/P in another contact. When that contact was over I answered with G S 3 Papa Yankee Echo, this is Pappa Delta 4 Kilo Hotel/Portable and heard the answer Pappa Delta 4 Kilo Hotel/Portable ... followed by noise.

I made a little yell which made my wife come out to see what was happening. But there was still the question whether my callsign got across and logged as a valid contact. That was answered minutes later: the contact was visible in the 2014 - Lewis Logbook - Camb-Hams DX blog. I will send a QSL card and request one.

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2014-04-28 (And my first successful satellite QSO was made to this fun DXpedition, found myself in the log as PD4KH...) 6 years ago
Google+Koos van den Hout : And my first successful satellite QSO was made to this fun DXpedition, found myself in the log as PD4KH/P at http://dx.camb-hams.com/dx-peditions/lewis-dxpedition-2014-overview/logbook/ I will request a card via bureau and send one. M0MJH +Mark Hickford was the operator at the other side using callsign GS3PYE/P.

I was in the backyard on an SO-50 pass right overhead. I think the neighbours have heard my yell of happyness and can use some explanation.

The hardest part in making that first satellite QSO for me was hearing callsigns in the noise. After that comes dealing with doppler shift which changes the most right in the part of the pass which has the best reception due to the distance to the satellite being the shortest.
2014-04-28 (#) 6 years ago
Not really distributed SSH scanning this morning:
[Fail2Ban] SSH: banned 61.174.51.219
[Fail2Ban] SSH: banned 61.174.51.224
[Fail2Ban] SSH: banned 61.174.51.223
Whois data:
inetnum:        61.174.51.192 - 61.174.51.255
netname:        HANGZHOU-SRT-TECHNOLOGY-CO-LTD
country:        CN
descr:          HANGZHOU SRT TECHNOLOGY CO., LTD

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2014-04-27 (#) 6 years ago
I had a look at creating a simpler QSL card which I could print with my own printer. I still want 4 cards per page. The earlier qsl card designs are nice and an inspiration for when I get around to having cards printed. But I want a few things different, like a mention of my amateur radio website http://pd4kh.idefix.net/, on the card. And space for notes about contacts. And when I use my own printer and heavy enough paper I want to print 4 cards per A4 page. Having 4 the same cards on one page meant wanting to use \LaTeX and a \newcommand so I define the card once and use it four times all of them on the same printer page. I found A QSL card backside made in LaTeX - DJ1YFK's Ham Radio Stuff which has a nice QSL card design in \LaTeX which I could use with some adjustments. This \LaTeX file defines the page size as 14cm*9cm landscape, the official size of a QSL card. I first tried changing this to an a4 page with 4 14cm*9cm \fbox in it, but this didn't give me the right result. I now create 4 pages of 14cm*9cm and create an A4 page from this with:
$ pstops -pa4 "4:0L@1.0(30cm,0)+1L@1.0(30cm,14.85cm)+2L@1.0(40cm,0)+3L@1.0(40cm,14.85cm)" qsl.ps qsl-4.ps
Which has about the right result: 4 cards on one page. No frames around the cards yet.

I use the coloured Veron logo, but it prints fine in grayscale on my black and white printer.

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2014-04-24 (Interesting idea: using a telescope tracker mount as an azimuth/elevation rotator for tracking satellites...) 6 years ago
Google+Koos van den Hout : Interesting idea: using a telescope tracker mount as an azimuth/elevation rotator for tracking satellites. Needs support for the specific protocol used by the tracker in the software. +Eric Grumling demonstrates gpredict with hamlib and support for NexStar protocol.
2014-04-23 Trying to find the Lituanicasat-1 6 years ago
I just noticed: LituanicaSAT-1 FM transponder test - Amsat UK which mentions an upcoming test of the FM transponder on LituanicaSAT-1 tomorrow April 24th between 13:30 UTC and 15:00 UTC. And I may be able to at least listen to one pass in that time period, there is a pass for me between 13:55 and 14:05 UTC with max elevation 47⁰. Would be really nice if the transponder would still be active the next pass since that will be at max elevation 84⁰.

After updating gpredict does know about the orbital elements of Lituanicasat-1 but not about the transponder. So I added that myself. The format of the .trsp files isn't very complicated, so I created /home/koos/.config/Gpredict/trsp/39571.trsp with:
[Mode V/U FM Voice]
DOWN_LOW=435175500
UP_LOW=145950000
MODE=FM, PL 67.0 Hz

Update: .. no signal. I received nothing and heard no response to my CQ. I notified the LituanicaSAT-1 team of my experience. Who quickly answered with the question 'are you tracking the right satellite'.
Which was indeed the problem: Gpredict had the name 'LITUANICASAT-1' for Norad catalog number 39571 but it is now 39569. I also renamed the transponder file to /home/koos/.config/Gpredict/trsp/39569.trsp. Searching for LituanicaSAT-1 finds a few more places where it is listed with Norad catalog number 39571 so I guess there has been a change in the listed information.

Using strikeout a lot so I hope I won't add to the confusion.

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2014-04-22 Combining websdr and fldigi 6 years ago
Combining a websdr with fldigi gives me great views of PSK31 traffic, but this evening I also tried receiving APRS, with the audio routed from the java plugin to fldigi using padsp multimon. This crashes a lot, but disabling the scope helps, padsp multimon -s SCOPE. But the 2 meter signal from HF/VHF/UHF WebSDR at the Maxwell Foundation in Eindhoven was too noisy and had interference from other signals to decode anything. I have listened to 2 meter stations via this websdr just fine so I think this could work when the current interference is gone.

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2014-04-18 Differences in orbits when tracking the ISS 6 years ago
Another ISS pass and I was already aware the orbit may be changing a bit since gpredict and hamsatdroid were disagreeing on the time of the pass.

And indeed, the ISS pass started around the later time from gpredict. I heard the AFSK data clearly. The signal from the ISS is strong enough that I can receive it most of the pass with the arrow antenna just pointing directly up. Maybe I can use this to record an entire pass and decode the AFSK data.

I guess celestrak.com (used by gpredict by default) is better up to date than amsat.org (first option in hamsatdroid). Since hamsatdroid can also use the celestrak.com data I switched to this source. The fun part is that satellite names aren't the same. 'SO-50' according to amsat is 'SAUDISAT 1C (SO-50)' according to celestrak.

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2014-04-18 (#) 6 years ago
A bit of searching later found the right incantation to make gnuplot adjust color based on a third value (signal level in my case). It isn't very complicated:
set size square
set angles degrees
set polar
set grid polar 30
set xtics axis 0,30
set ytics axis 0,30
unset border
unset param
set xrange[-90:90]
set yrange[-90:90]
set rrange[0:360]
set trange[0:90]

set title "GPS satellite tracks"
set xlabel "Azimuth"
set ylabel "Elevation"
set terminal png size 600,600
set output "gpsazelsig.png"
plot "gpsazelsig.dat" using 1:2:3 palette notitle
But the resulting plot isn't very helpful for my original question: in which direction radio signals are obstructed. There are some obstructions in the Southwest, but they are comparable to what is in the Northeast.

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2014-04-16 (#) 6 years ago
I want to get an idea of the 'radio shadow' around our backyard to get a better idea of the minimum elevation to receive from and transmit to amateur radio satellites. Since there still is a gps receiver on the roof of the shed and the earlier ntp experiments aren't running at the moment I decided to stop ntp and log the $GPGSV GPS satellites in view messages from the gps unit. My idea is that the radio signals from GPS satellites get obstructed by houses at least the same as UHF signals, so a GPS satellite reception plot will be interesting. Something like the VisualGPS plot I made at a previous house with a different GPS unit. Note that the plotted satellite tracks are way outside the plotted contour which I recall was a nice approximation of the view during the test.

Now to get this data plotted with gnuplot in a polar plot. I found out the orientation of $GPGSV messages (true north is 0 degrees, east is 90 degrees, south is 180 degrees, west is 270 degrees) does not match the azimuth range available by the polar plot in gnuplot (0 degrees is to the right, 90 degrees is up, 180 degrees is to the left). And the horizon is 0 in $GPGSV messages and maximum range in gnuplot. Time for some perl massaging of the $GPGSV lines to gnuplot orientation:
#!/usr/bin/perl -w

use strict;

while (<>){
    chomp;
    if (/^\$GPGSV,\d+,\d+,\d+,([\d,]+)\*[0-9A-Z]{2}$/){
        my @fields=split(/,/,$1);
        while ($#fields>0){
            my $sv=shift @fields;
            my $elevation=shift @fields;
            my $azimuth=shift @fields;
            my $signal=shift @fields;
            if ($signal){
                warn sprintf "SV %d elevation %d azimuth %d signal %d\n",$sv,$elevation,$azimuth,$signal;
                $azimuth=90-$azimuth;
                if ($azimuth<0) {
                    $azimuth+=360;
                }
                printf "%3d %3d\n",$azimuth,90-$elevation;
            }                   
        }               
    }           
}       
And indeed we have data:
SV 33 elevation 27 azimuth 205 signal 38
SV 29 elevation 83 azimuth 100 signal 44
SV 31 elevation 48 azimuth 227 signal 45
SV 21 elevation 47 azimuth 169 signal 44
SV 25 elevation 29 azimuth 122 signal 41
And azimuth/elevation in a file that gnuplot can handle:
245  63
  8   9
283  40
226  44
326  64
The azimuth/elevation data, modified for gnuplot. And the next step is a gnuplot plotscript:
set size square
set angles degrees
set polar
set grid polar 30
set xtics 30
unset border
unset param
set xrange[-90:90]
set yrange[-90:90]
set rrange[0:360]
set trange[0:90]

set title "GPS satellite tracks"
set xlabel "Azimuth"
set ylabel "Elevation"
set terminal png size 600,600
set output "gpsazel.png"
plot "gpsazel.dat" using 1:2 notitle
Which indeed gives a nice plot of some recent data.

Main conclusion: this sirf star II gps is 'too good' for this application. For example, one measurement:
SV 5 elevation 4 azimuth 86 signal 37
Satellite 5 seen at an elevation of 4 degrees above the horizon in easterly direction with a signal/noise ratio of 37 dB. There are high buildings (4 floors) in the easterly direction so I think I'm seeing the gps receiver being way too good at this.

The good part is that I'm not the first one to think of this: GPS Skyline: A Panorama in 1.6GHz Microwave-"Light" which suggests I need to find the right cutoff value for my type of GPS unit.

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2014-04-16 (Another nice video of how to work amateur satellites. He mentions +K7AGE and his videos on working amateur...) 6 years ago
Google+Koos van den Hout : Another nice video of how to work amateur satellites. He mentions +K7AGE and his videos on working amateur satellites.
On programming an HT: I have my Wouxun KG-UVD1P programmed with several adjacent memories for SO-51, each with a doppler-shifted UHF frequency for receive and the VHF frequency+PL tone for transmit. The programming software (chirp) calls these 'split' memories.
2014-04-15 (#) 6 years ago
Modern times, attacks on hosts via both IPv4 and IPv6:
Apr 15 15:23:56 greenblatt kernel: [4741660.011622] FW reject: IN=ppp0 OUT= MAC= SRC=175.44.9.137 DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=6517 DF PROTO=TCP SPT=49363 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Apr 15 15:23:57 greenblatt kernel: [4741660.370701] FW reject: IN=ppp0 OUT= MAC= SRC=175.44.9.137 DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=8371 DF PROTO=TCP SPT=49363 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Apr 15 15:23:58 greenblatt kernel: [4741660.768693] FW reject: IN=ppp0 OUT= MAC= SRC=175.44.9.137 DST=xx.xx.xx.xx LEN=48 TOS=0x00 PREC=0x00 TTL=115 ID=10428 DF PROTO=TCP SPT=49363 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Apr 15 15:23:58 greenblatt kernel: [4741660.924225] FW reject: IN=ppp0 OUT= MAC= SRC=2002:af2c:0989:0000:0000:0000:af2c:0989 DST=xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx LEN=68 TC=0 HOPLIMIT=120 FLOWLBL=0 PROTO=TCP SPT=50764 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Apr 15 15:24:01 greenblatt kernel: [4741662.117101] FW reject: IN=ppp0 OUT= MAC= SRC=2002:af2c:0989:0000:0000:0000:af2c:0989 DST=xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx LEN=68 TC=0 HOPLIMIT=120 FLOWLBL=0 PROTO=TCP SPT=50764 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Apr 15 15:24:07 greenblatt kernel: [4741664.510439] FW reject: IN=ppp0 OUT= MAC= SRC=2002:af2c:0989:0000:0000:0000:af2c:0989 DST=xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx LEN=68 TC=0 HOPLIMIT=120 FLOWLBL=0 PROTO=TCP SPT=50764 DPT=21 WINDOW=8192 RES=0x00 SYN URGP=0
Same source via IPv4 and IPv6 with 6to4.

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2014-04-15 (#) 6 years ago
It has been ages since I wrote about pump'n'dump spam where spammers try to inflate prices of stock for their own personal gain. It looked like the problem had almost gone away, but the last few weeks one stock is spammed again. Someone is set on making a profit or at least investing money in minimizing the damage with the RCHA stock (Rich Pharmaceuticals, Inc) and has been at it since at least 4 April 2014 now.

Dynamoo has a good write-up: RCHA / Rich Pharmaceuticals, Inc pump-and-dump spam - Dynamoo with graphs. Stock price and volume is following the pattern of a pump and dump scam.

Even the company itself is now reporting about the spam: Rich Pharmaceuticals Warns Investors of Unauthorized Spam Stock Promotion - Press release via Reuters. I consider the stock market a form of gambling anyway so I'll skip the links to "serious" stock advice about the RHCA stock.

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2014-04-14 (#) 6 years ago
When documenting something I have to look up the full path of some file and have it ready for cut-and-paste. I found out the easy way to canonicalize a filename:
koos@greenblatt:~$ readlink -f ../../etc/radvd.conf
/etc/radvd.conf

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2014-04-14 Listening to the International Space Station 6 years ago
This evening had no high Saudisat SO-50 passes at friendly times but it did have a nice overhead ISS pass around 22:15 localtime. I noticed the AFSK signal later than I expected according to the azimuth/elevation calculated by gpredict and reception stayed fine when gpredict said elevation had dropped to about 1 degree above the Eastern horizon. There are high buildings in this direction, so I guess the orbit has changed a bit compared to the latest data I had. AFSK reception was fine, maybe I should try to record the outgoing audio somehow so I can decode it later.

I have programmed the ISS region 2 voice frequency from the ISS Frequencies - ISS Fan Club into my radio so I could hear voice communications or even try to make a contact when the ISS is overhead. Reading the Recorded ISS radio contacts - ISS Fan Club page shows some radio amateurs have been trying that for 2 years before succeeding so it won't happen easily.

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2014-04-07 Trying to hear amateur satellites and the right way to make contacts 6 years ago
Trying to hear and work the SO-50 satellite as PD4KH portable has one downside: certain types of weather don't agree. The first pass this evening was really nice, straight overhead. But closer to earth there were serious rainclouds overhead causing a downpour so I opted to skip that one. A pass later in the evening started dry so I went outside. During the pass it started to rain again a bit so I had to dry my laptop after I was done! It was a low West-North pass and those are harder to follow from our house. But I did hear some voices and I think I understood at least one callsign, but checking the live oscar satellite status page shows no callsign matching what I think I heard.

Update 2014-04-08: Another nicely timed West-North pass, without rain this time. I heard some interference, including someone who decided that whistling at the satellite was a good idea. Probably taken directly from the "what NOT to do with amateur satellites" handbook.

The pages maintained by Mike Rupprecht DK3WN about amateur satellites have some realaudio samples of good and bad use of the amateur satellites: SaudiSat 41, 42, 50 - Mike Rupprecht - Amateurfunk Betrieb über FM Satelliten - Mike Rupprecht - Amateurfunk I don't agree with the quoted statement by LA2QAA in the last article of being proud of never using the "easy" FM amateur satellites. A more positive approach is needed in my opinion.

One "mental" switch I have a problem with: with the squelch completely open I hear noise when I'm either not listening to the satellite or the satellite is not in use by another amateur. With listening to "earth" FM repeaters at normal squelch settings I'm used to noise meaning that someone is trying to use the repeater but failing. This means pressing the transmit button when hearing noise on the satellite is a bit "unnatural" to me.

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2014-04-06 (+Hans PD0AC writes about chirp (tested under Linux, which is also what I use). I couldn't agree more...) 6 years ago
Google+Koos van den Hout : +Hans PD0AC writes about chirp (tested under Linux, which is also what I use). I couldn't agree more with him, it's a great program to edit memory channels and extra options in lots of radios.
And I never have to boot into Windows just to fix a memory channel on my radio.
2014-04-06 (#) 6 years ago
The fact I can't get status information from the fritz.box such as linespeed in a way I can use in scripts annoy me, especially since the linespeed changed tonight (to 22381 down 1402 up). I'd like to at least have access to those statistics for my pretty graphs again. I did find Universal Plug and Play How to get Status-Information from the FRITZ!Box which uses the Perl Net::UPnP::ControlPoint module. The downside is this module wants to discover upnp devices by itself via multicast. So I need to setup a specific route for 224.0.0.0/4 from the server. It does discover the Fritz!Box, but thinks it has no further information:
$ ./get_upnp_info.mcast .
Device = FRITZ!Box Fon WLAN 7360
No possible actions. Digging a bit into the code reveals the problem is probably in the XML parsing bit. Changing the xml parser to search in namespace urn:dslforum-org:service-1-0 gives a tiny bit more:
$ ./get_upnp_info.mcast .
Device = FRITZ!Box Fon WLAN 7360
URL = http://192.168.178.1:49000/l2tpv3SCPD.xml
urn:any-com:serviceId:l2tpv31::GetInfo:ServerInstanceId = 0000001F8BF6F4502F99CFB2F71DC374ECD623A957E08803247CDC9AD3856FF4DDA943C535C22E937DE07643AB2A6BBFEC45DED2FBF0E95AC5C2B3B28699F07
urn:any-com:serviceId:l2tpv31::GetInfo:ServerIP = 192.168.178.1
urn:any-com:serviceId:l2tpv31::GetInfo:RemoteEndIds = fritz.box:guest
But no DSL upstream and downstream yet.

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2014-04-03 (I recently bought myself an arrow satellite antenna and tried it a few times, trying to receive SO-50...) 6 years ago
Google+Koos van den Hout : I recently bought myself an arrow satellite antenna and tried it a few times, trying to receive SO-50. And wrote about the experiences.
2014-04-02 A new and better antenna for amateur satellite work 6 years ago
I ordered and received an Arrow Antenna: hand held portable dual band 2m/70cm Yagi satellite antenna. It came in last Saturday afternoon. And now I constantly look at the amateur satellite trackers on my laptop and tablet to see when passes come up for satellites that I can receive in FM. First receiving: I don't want to be the proverbial alligator on the amateur satellites (all mouth and no ears).

Our house being in a quite built-up area means when the elevation doesn't get above around 20 degrees there will not be a lot of chance to receive the satellite.

What I am looking for is satellites I can receive (and work) with the FM handheld transceiver. I focus on Saudisat-1c, the International Space Station and Oscar-11. Oscar-11 is an older amateur satellite but I could be lucky with receiving telemetry in AFSK format.

This evening had an 'easy' pass of Saudisat-1c usually known as SO-50, straight over my head. The obvious upside is: no buildings in the way. The less obvious upside: a shorter distance to the satellite, less signall loss. With headphones to hear the incoming audio in both ears I was able to hear callsigns. I'm not sure I heard a complete QSO. What I learned was that the moment the reception is clearest (shortest radio path) is also the moment of the biggest Doppler shift in receive frequency.

I also had a reasonably easy pass Saturday evening. I reported both passes to the OSCAR Satellite Status page by KD5QGR.

Update 2014-04-04: This evening I heard the AFSK1200 noises from an ISS pass! Amazing how fast the enormous mass of the International Space Station flies across the horizon. In 6 minutes it passed from azimuth 218⁰ (southwest) to 80⁰ (north of east).

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2014-04-02 Configuratie voor VDSL van xs4all met het eindpunt op een linux server 6 years ago
Deze configuratie is ondertussen achterhaald: de firmware updates voor de 7360 maken telnet toegang en een startup script in /var/flash/debug.cfg onmogelijk. Mijn huidige configuratie staat in Xs4all VDSL met DrayTek Vigor 130 VDSL modem en PPP eindpunt op Linux (ubuntu) server.

Mijn configuratie is natuurlijk gebaseerd op PPPoE passthrough op Fritz!Box 7360 voor XS4all VDSL maar ik gebruik (Ubuntu) Linux.

Mijn huidige /var/flash/debug.cfg op de Fritz!Box 7360:

sleep 120
killall dsld
sleep 10
brctl addif lan ptm_vr9
ifconfig ptm_vr9 up
De Fritz!Box 7360 hangt aan een 802.1q geschikte switch die vlan 2 native en vlan 6 tagged accepteert op deze poort. Uiteindelijk komen beide vlans uit bij de server, en die heeft voor deze vlans de volgende configuratie in /etc/network/interfaces:
iface eth0.2 inet static
        address 10.0.0.150
        netmask 255.255.255.0
        broadcast 10.0.0.255
        up ifconfig $IFACE -multicast
        up ip addr add dev eth0.2 192.168.178.11/24

auto eth0.6
iface eth0.6 inet static
        address 0.0.0.0
        netmask 0.0.0.0
        broadcast 255.255.255.255
De configuratie voor eth0.6 geeft een foutmelding maar resulteert wel in een beschikbare eth0.6 zonder IP adres erop.

Voor de ppp sessie heb ik in /etc/network/interfaces:

auto pppoe
iface pppoe inet ppp
        provider xs4all-vdsl
Dit start dus pppd met als configuratie /etc/ppp/peers/xs4all-vdsl, deze file is natuurlijk grotendeels afgeleid van de adsl/pppoa naar pptp configuratie die ik eerder gebruikte. De inhoud van /etc/ppp/peers/xs4all-vdsl:
plugin rp-pppoe.so modem
user koos@xs4all.nl
noipdefault
ipv6 ,
ipv6cp-use-persistent
defaultroute
persist
maxfail 0
noproxyarp
ipparam xs4all
lcp-echo-interval 10
lcp-echo-failure 3
pty "pppoe -I eth0.6"
mtu 1492
mru 1492
Vervolgens moet er IPv6 adresruimte aangevraagd worden via DHCPv6 met prefix delegation. Om dat proces te bespoedingen geef ik vanuit /etc/ppp/ipv6-up.d/dhcp6 een SIGHUP naar dhcp6c met
#!/bin/sh

kill -HUP `cat /var/run/dhcp6c.pid`
De configuratie van wide-dhcpv6 in /etc/wide-dhcpv6/dhcp6c.conf voor prefix-delegation naar eth0.1 en eth0.3 :
interface eth0.1
{

};
interface eth0.3
{

};
interface ppp0
{
        send ia-pd 0;

        script "/etc/wide-dhcpv6/dhcp6c-script";
};
id-assoc pd {
    prefix-interface eth0.1 {
        sla-id 1;
    };
    prefix-interface eth0.3 {
        sla-id 2;
    };
};
Vervolgens wil ik nog een extra uitgaand adres toevoegen voor uitgaand verkeer en verkeer voor de toegekende /48 adresreeks wat ik verder intern niet kwijt kan niet weer de ppp verbinding opsturen. In /etc/ppp/ipv6-up.d/outgate:
#!/bin/sh

ip -6 addr add 2001:xxx:xxxx:xxxx::13/128 dev ${PPP_IFACE}
ip -6 route add unreachable 2001:xxxx:xxxx::/48
Met een fritz!box gaat het voorlopig niet lukken om de mtu/mru weer naar 1500 te krijgen. De keuze is dus om op andere plekken hier rekening mee te houden. Voor IPv6 staat nu in /etc/radvd.conf:
interface eth0.1
{
   AdvSendAdvert on;
   AdvHomeAgentFlag off;
   AdvLinkMTU 1492;
   prefix ::/64 {
                AdvOnLink on;
                AdvAutonomous on;
                AdvPreferredLifetime 604800;
                AdvValidLifetime 2592000;
   };
};
Dit voorbeeld neemt automatisch de door wide-dhcp6c ingestelde adressen over. Dat heeft een nadeel: bij elke DSL hik raak ik ook intern alle IPv6 adressen en verkeer kwijt. Ik ben dus overgestapt op het met de hand instellen van de adresreeksen.

En in de iptables regels:
ip6tables -t mangle -A FORWARD -o ppp0 -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables -t filter -A OUTPUT -o ppp0 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

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2014-04-01 (#) 6 years ago
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   4. http://1D.medicjkyei.ru/?r=xxxxxxxxxxxxxxx8D546D23D6D8&20E1AAF40D
   5. http://1D.medicjkyei.ru/?r=xxxxxxxxxxxxxxx8D546D23D6D8&9EE36C9B1C&unsubscribe=*****@****.nl
No I didn't and I'm not going to follow that "unsubscribe" link. Interesting how this spam shows up on lots of sites that seem to automatically convert e-mail into website posts.

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, reachable as koos+website@idefix.net. PGP encrypted e-mail preferred.

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Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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