Solaris

Okay, the new netmask ffffff00 seems correct.
The netmask changed indeed, but not yet the (less important) broadcast address.
Please verify that you can ping all servers now!
To make the change permanent, please edit /etc/netmasks with a simple text editor e.g. dtpad (or xemacs or vi).

Code:

dtpad /etc/netmasks

And put a line

Code:

172.21.87.0  255 255.255.0

If there are other lines that begin with 172.21. then delete them.
After saving the file, test with

Code:

cat /etc/netmasks

Then run

Code:

ifconfig bcme1 netmask + broadcast + up

and verify with

Code:

ifconfig bcme1

This should use the values from /etc/netmasks,
and this time it should become

Code:

inet 172.21.87.148 netmask ffffff00 broadcast 172.21.87.255

The "connection closed" is another problem.
It can have several reasons, most likely caused by a special configuration on ServerB.
Maybe

Code:

ssh serverB

works?

Hi MadeInGermany,

I have did the settings as instructed by you and now the netmask have successfully changed

goofy:/ % ifconfig bcme1 netmask 255.255.255.0 up
@goofy:/ % ifconfig bcme1
bcme1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
inet 172.21.87.148 netmask ffffff00 broadcast 172.21.87.255
ether 0:16:35:6b:a4:14

I will try to restore the data which is required by trying to connect to ServerB, and will let you know if that was successful

And now am able to ping all the servers from ServerA

I will check on why it is not able to ftp and telnet to ServerB

ssh serverB also works

Will let you know, if i face any other issues

Thanks for all you help and suggestions, your help is highly appreciated and helped me a lot

Thanks once again

Regards,
Sanjay

Hi MadeInGermany,

Thanks a lot for all your help in resolving the server errors

Now am able to ping all the servers and was also able to do the datat restoration from the listener server

But I got one more error from the server, the server team wants me to check the below
"is the server speed duplex set to 100/full ? Also try to check the NIC. .is it ok ? ", they received serious errors like :- port error detected. Please help to check the speed and duplex and the NIC health

Kindly let me know how to check on these errors and what are these errors specifying?

Thanks In Advance for your valuable time and suggestions

Regards,
Sanjay

Duplex setting is adapter-specific.
Don't know about the bcme adapter.
Try (as root)

Code:

ndd /dev/bcme \?

If it works, you get a listing of the adapter parameters. Then, instead of the \? put a parameter related to duplex/speed setting, and you'll get its value.
But, if you managed to copy data in reasonable speed, there is certainly no duplex/speed mismatch. (With a mismatch, it takes at least 10 times longer.)
Another diagnostic command is

Code:

netstat -i 3

and in parallel do some data transfer. The errs columns should stay at 0 (please ignore the 1st line).