Hi,
In my vmware workstation i have installed 2 RHEL 5.3 server.and when i am trying to ping each other through PING command it showing From 192.168.2.4 icmp_seq=2 Destination Host Unreachable ......

and if i am giving command PING <host_name>
it is throwing "UNKNOWN HOST"

please tell me how to configure everything for to get the right result.

Regards,
Arya

I can't tell you the answer for your network setup since by glassball is currently broken but your second problem sounds a bit like a DNS issue. Without access to a DNS server or the relevant entries in the hosts file your machine can't find an IP address if you use <ping hostname>.

No DNS issue but the issue could be in networking setup at the VMware application:
what are the VM network connections listed when you installed your OS on VMware, there should be something like VMnet1* or VMnet8* check the IP assigned to both and find out which one matches to the IP assigned to the OS when you login to VM. As by default the OS takes the IP from DHCP in case of Linux from one of the connections through VMnet*.
The one which matches with your OS IP should be setup as the GATEWAY in the network settings of the VM OS.
Do not forget to restart the network service after the setup.
Hope that solves your problem.

is there a particular reason you are using a VERY old version of rhel5
5.3 is 6 versions out of date

RHEL 5.9 is the current and last in the older 5 series
with RHEL 6.4 the current

you are trying to ping one Virtual install from a second virtual install , all inside VMware ?

RHEL5.3 might really be a bit old, 5.9 is the current.
Upgrading to 6.4 might be a bit overkill depending on your environment and needs, it does some things a bit different and has different (higher) hardware requirements.

What is your VMware network setup? Bridged? NAT'd?
Which VMware workstation version on which OS?