Linux ESX host unpingable

We have created a news Linux host under VMWare ESX, now its pingable if its in the same subnet i.e.10.40.x.x but if we try to ping or telnet to it from a different subnet i.e. 10.10.x.x, it doesnt want to work....

I have tried to move it a different ESX host, restarted it, didnt change anything.

Any ideas?
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LeoAsked:
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TemodyPickalbatros, IT ManagerCommented:
Make sure your subnet mask in both 255.0.0.0
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Neil RussellTechnical Development LeadCommented:
More importantly check that the Default Gateway is set on all devices along the chain correctly.  Often I see people with misconfigured or NO default gateway with the self same problem.

If your host does not know the route back to the client that is trying to ping it, your kind of stuffed.
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LeoAuthor Commented:
so it wont be 255.255.255.o?
how do i change subnet mask on linux?
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Neil RussellTechnical Development LeadCommented:
If as you said, its the HOST that is not pingable then you need to log onto the console and set the network settings there.

IF Its a guest then it will depend on the flavour of linux and if you have a GUI for managing it.
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LeoAuthor Commented:
it has the correct default gateway, and it doesnt have GUI to manage it......
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TemodyPickalbatros, IT ManagerCommented:
# ifconfig eth0 10.x.x.x netmask 255.0.0.0 up
# ifconfig eth0
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Neil RussellTechnical Development LeadCommented:
What does? You have said ESX HOST.  The HOST always has the front end to manage it.  You go to the console and press F2
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
what communications do you want to have with this Linux VM ?

do you really need to be able to "ping" it from the Host ?

Do you have other devices on this network ?
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LeoAuthor Commented:
we need to have telnet communication.
ITs not about the ping, ping is just a test, the real thing we want to do is to telnet to it from a different subnet........

yes we have other devices on the network?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
This Linux VM, what network does it need to communicate with ?
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LeoAuthor Commented:
10.40.x.x to 10.30.x.x
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, so is your host currently connected to the following networks ?

10.40.x.x and 10.30.x.x ?
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LeoAuthor Commented:
yes, they are....so they can telnet within there subnet, means the machine we are trying to telnet its accessible within 10.30.x.x but when we try to access it from 10.40.x.x it doesnt work.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, can you upload a screenshot of your Host Networking?

All you need to do, is create a virtual machine portgroup and connect a physical network interface to the 10.40.x.x and 10.30.x.x networks.

and then connect the VM network interface to the 10.40.x.x virtual machine portgroup.
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LeoAuthor Commented:
i have attached the host snapshot, let me know if thats what you are after.

Can you please let me know how can i creat a virtual machine port group? when you say "connect a phsical network interface", can you please clarify what you mean?
Host.jpg
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You need to physically connect the physical nic of the Server to the 10.40.x.x  network.
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LeoAuthor Commented:
but thats a virtual host....how can i physically connect the nic to server.
do you have any instructions which will make it more clear......
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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