I’ve been thinking on how to create reverse zone for /64 subnet from delegated routed /48 from Hurricane Electric. First when i was first time request delegation for routed /48 i’ve defined this configuration on my nameservers
In named.conf
zone "7.e.8.f.0.7.4.0.1.0.0.2.ip6.arpa" {
type master;
file "reverse-2001-470-f8e7_48.IP6.ARPA";
};
Here’s how to do it
# ( cat <<HEADERS; cat /root/file.html) | sendmail -oi -t From: sender@domain.tld To: recipients@domain.tld Subject: we send HTML instead of plain text Mime-Version: 1.0 Content-type: text/html Content-transfer-encoding: 8bit HEADERS <- type CTRL+D then press ENTER
We should set Mime-Version , Content-Transfer-Encoding and Content-Type headers properly. The issue of correct MIME transfer encoding is one of the many possible complexities which is simply ignored here.
I’ve just upgrading one of my dns server recently. Orginaly centos 4.7 using bind-9.2.4-30.el4_7.2. Although this version not affected by cache poisoning vulnerability. as Dan Kaminsky announced a massive, multi-vendor issue with DNS that could allow attackers to compromise any name server. Here’s how to upgrade bind-9.2.4 to bind-9.5.0.
Download the SOURCE rpms
# wget http://patrick.vande-walle.eu/upload/bind-9.5.0-33.P1.src.rpm
Compile/Build source RPM
# rpm -Ivh bind-9.5.0-33.P1.src.rpm # cd /usr/src/redhat/SPECS/ # vi bind.spec
find this lines
# configuration files:
tar -C ${RPM_BUILD_ROOT} -xf %{SOURCE28}
change it to
tar -C ${RPM_BUILD_ROOT} -xjf %{SOURCE28}
Source28 is tar.bz2 file so we need tar -xjf options
Prerequisites
Requirements for Policyd v2
Requirements for webui
Download policyd v2
# wget http://downloads.sourceforge.net/project/policyd/2.0.x%20%28Stable%29/v2.0.7/cluebringer-2.0.7.tar.bz2?use_mirror=biznetnetworks
Build rpm from source tarball
# rpmbuild -ta cluebringer-2.0.7.tar.bz2
Source: The Book of Postfix by Ralf Hildebrandt and Patrick Koetter.
In order to measure how much traffic our postfix can handle, we need to perform some kind of stress testing. To put an adequate load on the server, We need a fast mail traffic generator. Postfix comes with two programs named smtp-source and smtp-sink for this purpose. Here’s how they work:
This program connects to a host on a TCP port (port 25 by default) and sends one or more messages, either sequentially or in parallel. The program speaks both SMTP (default) or LMTP and is meant to aid in measuring server performance.
This test server listens on the named host (or address) and port. It recieves messages from the network and throws them away. You can measure client and network performance with this program.
The following example injects 100 total messages of size 5k each in 20 parallel sessions to a Postfix server running on localhost port 25. Because you’re also interested in how much time this takes, use the time command:
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