Red Hat

I get below error when using telnet and ssh ??
Why ? the ip address of linux server is 10.155.25.22 =tstgcota ??

[root@TSTgcota sbin]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.75.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.155.24.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 10.155.24.1 0.0.0.0 UG 0 0 0 eth0
[root@TSTgcota sbin]# telnet 192.168.75.1
Trying 192.168.75.1...
telnet: connect to address 192.168.75.1: No route to host
telnet: Unable to connect to remote host: No route to host
[root@TSTgcota sbin]# ssh 192.168.75.1
ssh: connect to host 192.168.75.1 port 22: No route to host
[root@TSTgcota sbin]#

is the network you are on connected to the destination server's network?
the destination server has a private network ip address (should not be accessible from the internet).
more about private networks here.

You tried to ping the server ? Did you verify the ssh service on your server ? Is the port 22 opened ? Is root allowed to ssh to the sever ?
Hope that helps!

Your computer and the remote computer are on different networks. IP addresses alone are not enough to simply get there. You need to set up a route to get to the remote computer.

Can you describe in more detail ?? what is the procedure to add route ??/
what "route" I need to add ???

Use google. We have given you the answer, but since we do not know how the entirety of your network is configured, you need to do this part.

The basics are

You/your subnet > gateway < remote system

Use the route command. man route for more information.

To see a list of the current routes (gateways will be flagged UG)

Code:

route -n

To add a gateway

Code:

route add gw .....