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November 15th, 2009
I had some time tonight to get IPv6 in windows working, and it does work
like a charm. See picture for the config (in german).
The IPv6 addresses are statically set and are behind a firewall. I can see
the dancing KAME turtle with IE8.
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5 Euros donated to Wikipedia
November 13th, 2009
I use wikipedia quite often. Especially when it gets a little boring. I hope
the five euros will cover my bandwidth charges, and it just wouldn't be the
same with flashing banners greeting me everytime I go there.
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Configuring a Dovecot POP3 server
November 12th, 2009
Here is the config file:
protocols = pop3 pop3s
protocol pop3 {
listen = 62.75.160.180:110
ssl_listen = 62.75.160.180:995
}
auth default {
mechanisms = plain
passdb pam {
args = *
}
userdb passwd {
}
}
ssl = yes
ssl_cert_file = /etc/ssl/certs/dovecot.pem
ssl_key_file = /etc/ssl/private/dovecot.pem
mail_location = mbox:~/mail:INBOX=/var/mail/%u
disable_plaintext_auth = yes
I had to install the pam-devel stuff for opensuse and add a certificate file
that can be generated by a script in dovecots build_directory/doc.
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A theoretical attack on WildcardDNS and the Internet
November 7th, 2009
This attack theorizes on an attack on caching recursing nameservers. Pretend
someone runs wildcarddnsd and thus wildcards the entire spectrum of their
domain
(zone).
this.is.valid.domain.com
stupid.little.tricks.domain.com
what.dns.is.not.domain.com
These are all valid A replies if domain.com has an A record set. Only problem
is that when someone uses up the entire 255 characters of a valid domain
name then the other recursing nameserver theoretically stores all this in
memory for at least the time to live. So if someone looks up:
abcdef...a.domain.com (255 characters)
defghi...b.domain.com (255 characters)
.. then there is an awful lot that is stored in RAM on a nameserver.
If a botnet looks up these long domain names they can cause economic damage
by wasting many many many bytes on an aggregate of foreign nameservers. And
the nameserver that does wildcardding will get the bandwidth bill for all those
lookups, although there is many "root servers" that have unlimited bandwidth
for 60 euros a month. It'll look like a DOS but it's not (yet it can lead to
a DOS).
To save the Internet some pain I've implemented the -W flag on my wildcarddnsd's and to basically save my ass the bandwidth charges.
Something to read that put me up to the idea:
PS: you don't need a botnet to do some damage. If you have a link that allows
spoofing you can spoof into networks that don't have ingress spoofing filters
on their routers and fake a question to DNS servers that would otherwise refuse
to answer you. With the amount of bandwidth one can get 50/10 Mbps a
considerable amount of damage can be done. So the protection against this is
to have solid networks out there that don't allow spoofing of any kind.
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Upgrade (Hell)
November 6th, 2009
This week I purchased and installed 3 things. One, Windows 7 Home Premium
edition. Two, VMware Workstation 7 and finally F-Secure 2010 Anti-Virus.
I've never had an anti-virus program before so this was a first install for
me.
I also downloaded Kubuntu 9.10 and installed it as my VMware host operating
system. That was necessary because my old Redhat lacked some libraries that
I needed for good sound support with the VMware Workstation.
So I had to move some OS's out of my active host team that I keep in the
on state in VMware, in order to accomodate the 1 GB footprint of Windows 7.
Windows 7 was a pain to install because vmware has crappy dvd support and
using a sparse file for the dvd didn't work due to some copyright protection.
When I install Windows I compartment a superuser and a regular user. This
way if there is a virus when I use windows, it can't write over system files
and install a root-kit or whatever. I usually name the superuser admin.
Only when installing Windows it asks to install a user and I didn't name it
admin but "pjp" my usual acronym. So when I learned that I wanted to install
"pjp" as a user with less privileges I had to rename the admin account. It
left the home directory as "pjp" and gave my pjp user the directory of "pjp_2".
Activating the one year subscription for the anti-virus was pretty easy and
I hope everything is protected now. I set it so that it scans files that I
download through the web (real-time).
These were just some experiences I had with this years upgrade, I probably
won't upgrade for at least another year unless something blows up badly.
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WildcardDNS bug fix
November 3rd, 2009
I fixed a bug in wildcarddnsd that caused zones to be 'lost'. Everyone who
uses wildcarddnsd should upgrade to the latest version or tag "BETA_3".
In the
CVS log there is more detail on what went in since BETA_2.
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Playing with xearth
November 2nd, 2009
rosalind$ history
...
44 xearth -pos "fixed 49 0" -sunpos "-15 0" -noroot -nostars -grid -markerf
ile markerfile
rosalind$ more markerfile
50.05 10.23 "pbug"
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