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 Virtual Switch issue - network dropping packets 
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Virtual Switch issue - network dropping packets
Hi everyone,

I finally got VMDirectPath working and has installed a FreeNAS VM on my ESXi4.1u1 system. It has 2 gigabit network cards plugged into my switch. After the FreeNAS install I noticed something weird, the webui would only load intermittently, after some troubleshooting I realized the connection from my laptop to the FreeNAS VM is really flaky, dropping about 50% packets using a simple ping test.

I then tested pinging from the ESXi vmkernel accessed via SSH, still a 50% packet drop. Keep in mind that since VMkernel port is on the same VSwitch as the FreeNAS VM, this shouldn't be as even if there was a physical network issue, these packets should be kept within ESXi on the virtual switch.

All settings are default for the network and I haven't made any modifications, any ideas?

Thanks in advance!


Sun Sep 18, 2011 12:06 pm
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Re: Virtual Switch issue - network dropping packets
Here's my vSwitch config:


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File comment: vSwitch
2011-09-18_1756.png
2011-09-18_1756.png [ 24.28 KiB | Viewed 7666 times ]
Sun Sep 18, 2011 1:57 pm
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Joined: Mon Mar 16, 2009 10:13 pm
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Post Re: Virtual Switch issue - network dropping packets
chinesestunna wrote:
I then tested pinging from the ESXi vmkernel accessed via SSH, still a 50% packet drop. Keep in mind that since VMkernel port is on the same VSwitch as the FreeNAS VM, this shouldn't be as even if there was a physical network issue, these packets should be kept within ESXi on the virtual switch.


That's correct. As long as you're on the same vSwitch/VLAN then it doesn't touch the physical NICs.

Have you tried it with the win7 VM yet? What virtual NIC options do you have for the FreeNAS VM?

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Dave Mishchenko
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Sun Sep 18, 2011 2:08 pm
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Re: Virtual Switch issue - network dropping packets
The Windows 7 VM is even more stuck, it can't even access the internet, using a standard E1000 setup and the NIC gets no DHCP. I have everything at default for the virtual port, Security has "accept" for all 3 exceptions, no traffic shaping and NIC teaming has no exceptions.

Even when I manually setup IP address etc in Win7 it can only ping things on the network but can't do much else with them. Also the ping TTL is 128 and not the usual 64.


Sun Sep 18, 2011 3:19 pm
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Post Re: Virtual Switch issue - network dropping packets
Weird - what kind of NICs are you using?

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Dave Mishchenko
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Sun Sep 18, 2011 3:28 pm
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Re: Virtual Switch issue - network dropping packets
I was using the default Intel E1000 adapters for both but have changed the one for FreeNAS over to the VMXNet adapter which improved things a bit to where it can get DHCP addresses now but I still can't hit it's webgui.

Windows 7 is still on E1000 and still stuck.

The system is running a pair of RealTek R8111D Gigabit cards on board, I used the oem.tar.gz posted here to get them working and so far everything from VMKernel NFS datastore to vSphere management works, just nothing on the actual VMs.


Sun Sep 18, 2011 3:37 pm
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Post Re: Virtual Switch issue - network dropping packets
Do you recall which oem file it was?

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Dave Mishchenko
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Sun Sep 18, 2011 4:25 pm
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Re: Virtual Switch issue - network dropping packets
download/file.php?id=136

that's the exact file, from this post:
http://engwar.com/post/392

which references this thread from vm-help.com:
viewtopic.php?f=12&t=1272


Sun Sep 18, 2011 4:58 pm
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Post Re: Virtual Switch issue - network dropping packets
You might try this one - viewtopic.php?f=12&p=7412#p7412

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Dave Mishchenko
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Sun Sep 18, 2011 8:44 pm
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Joined: Tue Sep 13, 2011 12:00 pm
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Post Re: Virtual Switch issue - network dropping packets
Dave.Mishchenko wrote:
You might try this one - viewtopic.php?f=12&p=7412#p7412


Haha, just about to. BTW - is there a way to change out those "drivers" without having to reinstall?


Sun Sep 18, 2011 9:08 pm
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