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I am learning networking. The problem is that i am running two virtual machine of linux operating system on virtual machine whose server addresses are and respectively.

I was doing my assignment on inter mail configuration that is sending mail between two mail servers located on two machines using (webmin) on window 7. The problem is when i change network configuration of second server( i lose the connection between window 7 and second server (

Is it related to mac address?

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Are you implying that before you changed the IP address to on server two that you had established Layer 3 connectivity between server one and server two? What subnet masks are configured for the two servers and what are the virtual Ethernet network adapter settings for each? –  cody.codes Jul 2 '14 at 9:20

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