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VirtualBox Networking

Posted on 2011-05-02
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Last Modified: 2012-05-11
I am trying to setup a lab to test Exchange Server. I am running Exchange Server on a VirtualBox virtual machine.

On the virtual machine, I have selected Bridged networking. I can get to the internet, can ping my host machine, router, etc.

My host machine is 192.168.1.10 and the virtual machine is 192.168.1.51.

I setup port forwarding on my router/firewall to forward port 25 to the virtual machine's ip. I also have public dns pointed to the external ip of my router/firewall.

I tried a telnet <my domain name> 25 and it failed. I also tried telnetting from my host machine on the same subnet. That failes to. If I run the telnet command on the Exchange server itself, it responds, so it is listening on port 25.

Since I can't telnet from the host machine, I think it must be something to do with the way I have networking setup on the virtual machine.

By the way, Windows Firewall is disabled on all machines.



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Question by:adam2112
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11 Comments
 
LVL 125
ID: 35508435
are you sure this is Bridged and not NAT?
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LVL 125
ID: 35508444
when you tried telnet on the Exchange server, did you try telnet 127.0.0.1 25 and it's ip address telnet 192.168.1.51 25?

both work?
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LVL 125
ID: 35508454
hang on, are we using hostnames or ip addresses here?

try IP addresses with telnet?
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Author Comment

by:adam2112
ID: 35509326
It is bridged.

From the Exchange Server I did a telnet to 127.0.0.1 but not 192.168.1.51.

From a remote pc I tried it by my registered DNS name that points to the public ip of my firewall. The firewall has port forwarding for port 25 that directs it to 192.168.1.51.
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LVL 125
ID: 35509348
if you telnet 192.168.1.51 25 do get a connection?
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Author Comment

by:adam2112
ID: 35509378
Tried telnetting from the Exchange server using telnet 192.168.1.51 25 and it was successful, too.
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LVL 125

Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 35509394
thats very odd, bridged networking should forward packets without filtering.
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Author Comment

by:adam2112
ID: 35509410
This is kinda strange. I shutdown the virtual machine, changed it to NAT, rebooted, shutdown, and changed it back to Bridged and now it's working in all scenarios.
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LVL 125
ID: 35509419
sounds like it was in NAT, bit of a bug.
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LVL 125
ID: 35509425
glad its all working, you running virtualbox 4.0.6?
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Author Comment

by:adam2112
ID: 35509477
Yep. 4.0.6
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