Centroid.EU Blog
(this blog is mostly encrypted - adults only)
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September 30th, 2016
I have donated $5 to FreeBSD Foundation. This wraps up FreeBSD donations
for this year, there is an OpenBSD donation coming in 2 months or so.
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Victim of spoofed Mail
September 30th, 2016
I've become victim of spoofed mail. Someone is sending mail with one of my
domains to other people, getting them mad, and I receive the bounces.
I do have SPF protection records but if the remote SMTP gateways don't enforce
SPF records, then it's not helping. Here is the IP's that a "valid" mail from
my domains would come from:
108.61.211.139
78.47.14.22
2a01:4f8:d13:1980::/64
2001:19f0:6c00:9041:5400:ff:fe11:3332
This is listed in SPF DNS records for my domains as well. I knew there was
a-holes on the Internet, and they finally got to me. Unfortunately there is
nothing I can do about this. If there is let me know what. I'm looking for
a technical solution.
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My IPv6 setup at M-net (german provider)
September 27th, 2016
I recently added IPv6 functionality to my network and had some obstacles to
overcome, such as:
- How to route deep into my network and assign each host an IP6 that is 2
hops deep.
- What to do about rfc1918 IP's, since I want a NAT64/DNS64 setup
- How to do NAT66 in order to use deep routes
Well to give you a better idea I'm going to show you my network plan:
Network map:
[gaia]-- [raspberry pi]
\ | [mercury]
[phone1] - \ | |
--- [uranus] === [Access Point] --- [gamma] ---- to pppoe cloud
[phone2] - / ||
/ ||
[beta]-- ||
[venus]-+--[spica]
| \
| +--[fritzbox LTE]------- to LTE network
|
[freifunk]
Legend: Hosts:
--- CAT5 cabling gaia + spica: apple computers running vmware
=== wifi 5 Ghz uranus: OpenBSD i386 on Lanner hw
|| wifi 5 Ghz venus: OpenBSD amd64 on Soekris hw
gamma: OpenBSD amd64 on PC Engines APU
fritzbox: AVM fritzbox router
Here is my dhcp6c.conf file:
keyinfo mnet {
realm "v6.mnet-online.de";
keyid 1 ;
secret "***notshown***";
};
interface pppoe0 {
send ia-pd 0 ;
script "/etc/nat66-up.sh";
};
id-assoc pd {
prefix-interface vether0 {
sla-id 1 ;
sla-len 0 ;
};
};
and with that the /etc/nat66-up.sh script:
#!/bin/sh
ADDRESS=`/sbin/ifconfig vether0 | grep inet6 | tail -1 | awk '{print $2}'`
NETWORK=`echo $ADDRESS | awk -F: '{printf("%s:%s:%s:%s:%s:%s::/64\n", $1, \
$2, $3, $4, $5, $6); }'`
/sbin/pfctl -t nat66 -T flush
/sbin/pfctl -t nat66 -T add $NETWORK
exit 0
I use a vether0 dummy ethernet interface to take on the IPv6 address from
my provider (mnet) so that I can give all other interfaces a 2001:db8::/56
address. This address gets translated later in my pf rules and the relevant
lines to the pf look like this:
table persist
table const { 2001:db8::/56 }
...
match out on $ext_if inet from to any nat-to ($ext_if)
match out on $ext_if inet6 from to any nat-to round-robin \
sticky-address
...
pass in on re2 inet6 from any to 64:ff9b::/96 af-to inet from ($ext_if)
pass in on re1 inet6 from any to 64:ff9b::/96 af-to inet from ($ext_if)
I would have liked putting (vether0:network) in place of the but found
that it translated to the fe80:: address and not the assigned address from
m-net. So I have to do it this way, it's no headache. Also the round-robin
was unfortuantely the only mode I got working, I would have liked to use
random to get a random IP6 on the outgoing /64.
So let's see what we got, we have native IPv4 NAT44'ed, we have dual-stack IPv6
NAT66'ed and we have NAT64/DNS64 on top of that. It's really cool, to show
you how the DNS64 works I'm gonna do a host lookup on censored.net which isn't
mine so please look at it just as an example:
beta$ host censored.net
censored.net has address 72.52.4.91
censored.net has IPv6 address 64:ff9b::4834:45b
censored.net mail is handled by 0 localhost.
Then when I route into 64:ff9b::/96 it gets af-to'ed in the pf rules to an
IPv4 address. It's really cool.
What else is missing? I want to show you the DNS setup with BIND from the
OpenBSD 6.0 ports, it worked out of the box. Here is what I had to add into
the options:
dns64 64:ff9b::/96 {
clients { 2001:db8::/56; 192.168/16; };
mapped { !10/8; !192.168/16; !172.16/12; any; };
exclude { 64:ff9b::/96; };
recursive-only yes;
};
That's really all there is to it, I had a lot of fun doing this and can't
wait until some services of mine use IPv6 so that I can drop the native IPv4
completely.
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Ordered a book from Amazon
September 20th, 2016
This time I want to learn more about USB. So I got:
- USB Complete: The Developer's Guide (Complete Guides) - Jan Axelson
Hopefully it was worth it.
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Equinox in two days
September 20th, 2016
Equinox is upon us again
in two days.
last year's equinox was on the 23rd of september and it was chilly in the
morning at 10 Celsius. Right now as I write this it's 16 Celsius and I'm
hoping I can keep the heat off another week. We'll see.
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Stand up for Snowden
September 14th, 2016
There is a website called "pardon Snowden". It asks you to sign a petition to US President Barack Obama to pardon
Edward Snowden before he leaves office. At the time of this writing Obama
still has 128 days in office. Think about what Snowdens chances are after
Obama? Would Trump pardon him? Would Hillary Clinton? Would anyone else?
Edward Snowdens whistleblowing which caused him to flee the USA and take up
asylum in Russia, caused US citizen no harm and did them a favour in showing
how out of hand the surveillance programme in the USA has become. Stand up
for your rights by signing the petition! I tried but realised it has to be
a US citizen. What sort of a world are we living in anyhow?
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TLS for centroid.eu blog, when?
September 14th, 2016
I'm going to restructure the website and the blog probably after the OpenBSD
6.1 release. Apparently there is a program in that release that manages
certificates from "let's encrypt". Since I'd want my whole website encrypted
I'd have to use let's encrypt several times to fully encrypt my website which
contains the domains virgostar.net, solarscale.de and centroid.eu. So if
you think the obfuscation is good enough, don't let it fool you, it was made
for a defense against bots (that don't know javascript) not to thwart spying
eyes. I'd run the same blog software only inside TLS with let's encrypt.
Props have to be given to Edward Snowden for his whistleblowing which caused
organizations like "let's encrypt" to form in the first place. Encryption
should be free!
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One more panic chronicle entry
September 9th, 2016
I woke up today to a panic'ed router/gateway. What a way to start the day.
backtrace here.
Why am I not sending these to OpenBSD anymore? dunno. I remembered there
was a reason once.
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I had photographed Vega and Constellation Hercules
August 30th, 2016
This picture is from June 27th, 2010 so a little over 6 years ago. My dad and
I were on the Peterstirn which is outside of Schweinfurt (the city that I live
in). This article is in relevance to the last article and I wanted to show
it again. I have made a cut-off from the original RAW
Photo and I want to show you this. Feel free to open the photo in another tab to
make it it's original size.
As you can see this area of the sky (at least in june) is visible. You just
gotta know what to look for. If you can find Vega you can find constellation
Lyra and from there the area that's circled which is part of Hercules. Inside
the circle somewhere lies the star system that emanates an 11 GHz signal.
Update. I have added the label to a star I think is called Ras Alhague in the
constellation Ophiuchus. Constellation Hercules goes further up from here but
I don't have that in my photo.
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The whereabouts of HD164595 in Hercules
August 30th, 2016
Slashdot made me aware of this story of a SETI signal
that was observed, last year by a russian SETI installation.
I have plotted the rough area of HD164595 it's somewhere in the circle but
what's important is the relative near-ness to the star Vega. It's in the
constellation Hercules, and should be visible this summer with Telescopes.
As far as aliens reacting to broadcasts from Earth they have just now recieved
signals from 1920's because they are 95 light years away. However they might
have been reacting to carbon in our atmosphere due to the start of the
industrial revolution in the 1800's. Meaning the aliens have telescopes. It
is hypothesized that they are a Kardashev scale I civilization if they are
directing this towards only us, so they are more advanced than us.
May they keep the signal going with the strength of Hercules :-).
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