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Showing posts from December, 2012

Jailing Bind(Named) User in Ubuntu

Exact step that i followed to jail bind user in ubuntu12.04.You can use following steps for almost any debian system.To known more about what is jailing ?? go to this link.
To known more about how to break a jail follow this link

     echo "/named/jail is our jail directory"     echo "inside it create a linux filesystem environment"     ls -l      cd dev     mknod null c 1 3     mknod zero c 1 5     mknod random c 1 8     ls -lk     clear     cd ..     cd /etc/     ls -l     cd /named/jail/     cd etc     ls -l     echo"move bind folder from /etc/bind to /named/jail/etc/bind"     echo "move bind folder from /etc/bind to /named/jail/etc/bind"     clear     nano /etc/default/bind9      clear     ls -l     cd bind/     ls -l     /etc/init.d/bind9 restart     echo "it didnt started...lets troubleshoot"     cat /var/log/syslog | tail -30     /etc/init.d/apparmor stop     clear     /etc/init.d/bind9 restart     cat /var/log/syslog | tail -30  …

BASICS OF DOMAIN NAME SYSTEM

Conventional name resolution transforms a DNS name into an IP address. At the highest level, this process can be considered to have two phases. In the first phase, we locate a DNS name server that has the information we need: the address that goes with a particular name. In the second phase, we send that server a request containing the name we want to resolve, and it sends back the address required.

Absolute (Fully-Qualified) and Relative (Partially-Qualified) Domain Name Specifications
We simply start at the root node and follow the sequence of subdomains down to the node in question, listing each level's labels separated by a dot. When we do this, we get single name that uniquely identifies a particular device.

Fully-Qualified Domain Names (FQDNs)
Technically, if a top-level domain “A” contains a subdomain “B” that in turn contains subdomain “C”, the full domain name for “C” is “C.B.A.”. This is called the fully-qualified domain name (FQDN) for the node. Here, the word “qualified” i…