DHCP relay agent concept

DHCP relay agent is configured to provide ipaddress to different segments of network.

Ex: we have 2 segments 192.168.1.1 and 192.168.2.1.. different network IDS.

One connecting to 192.168.1.1 and another card connecting to 192.168.2.1 network. When a client sends a broadcast for ipaddress the relay agent sends it to the DHCP server.

Open RRAS and ip routing, add new protocol, add dhcp relay agent
Add in the dhcp servers ipaddress

To view the DHCP server in a domain and which are authorized

Open command prompt:

netsh dhcp show server

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To check the directory partitions we have in a forest

Cmd

Ntdsutil

Domain management

Domain management :Connections

Server connections: connect to server server01

Exit

Domain management: list

Now we will receive list of domain partitions.

What is round robin in DNS?

Round robin: enables us to set multiple records of a given host name. and distributes the ip address in order. 

Ex:

Create a host name in dns as www. www.izone.com with ipaddress as 192.168.1.100

Create the same hostname with 192.168.1.200

Create the same with 192.168.1.300

When we try to ping the www.zone.com

Reply's as 192.168.1.100, 192.168.1.200, 192.168.1.300

Again ping www.izone.com

192.168.1.200, 192.168.1.300, 192.168.1.100

Again ping www.izone.com

192.168.1.300. 192.168.1.200, 192.168.1.300

So the order keeps on changing.

How to view the cached look ups in DNS 2003?

Open the DNS console ---click on view --- select advanced.

Once we select advanced, we will find another entry as cached look ups

Configuring UNIX DNS client:

Make sure your logged in as ROOT

Bash-2.03$  su

Password: xxxxxxx

Now use a text editor

# vi /etc/resolve.c

Now enter the domain and then name server

Domain Microsoft.com

Nameserver 192.168.1.2

We can also use search instead of domain, here we have an option to enter in till 6 domains and sub domains.

Ex:

Search  Microsoft.com east.microsoft.com

Now save the etc/resolve.conf file

#w