[Cialug] Linux router causing me some trouble

[Theron Conrey]

vmware tools installed in the guests?

-theron

On Mon, Apr 25, 2011 at 2:00 PM, Jonathan C. Bailey <
jbailey at co.marshall.ia.us> wrote:

> I ended up figuring this out on my own... Both of the virtual NICs in the
> VM were VMXNET3. After changing them to E1000, everything works great.
>
>
> -Jon
>
> ----- Original Message -----
> From: "Jonathan C. Bailey" <jbailey at co.marshall.ia.us>
> To: "Central Iowa Linux Users Group" <cialug at cialug.org>
> Sent: Friday, April 22, 2011 4:20:21 PM
> Subject: [Cialug] Linux router causing me some trouble
>
> I've been banging my head against the wall for the past few hours with a
> routing performance issue.. Here's the test configuration:
>
> testserver (physical host) <-----gigabit wired network-----> eth0
> troublerouter (Ubuntu 10.04 VM) eth1 <-----private vSwitch-----> testclient
> (Ubuntu 10.10), testclient2 (XP SP3)
>
> Test methods:
>  SpeedTest mini (on testserver)
>  iperf (Server: iperf -s -l 1024k / Client: iperf -c SERVER -l 1024k -P 10)
>
> Only configuration on troublerouter:
>  * Disabled IPv6 (ipv6.disabled=1 passed to kernel)
>  * Masquerade rule: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
>
> Test results:
>
> testserver <-> troublerouter with iperf: ~900mbit
> troublerouter <-> testclient with iperf: ~9gbit
> testserver <-> testclient with iperf: ~2mbit
> testserver <-> testclient with speedtest mini: ~200mbit down, hangs on
> upload
> testserver <-> testclient2 with speedtest mini: ~200mbit down, hangs on
> upload
>
>
> I ran wireshark to look at things, and I see multiple fragmentation needed
> messages (everything is 1500 from end to end), but that's about it. I tried
> setting the MTU to 1400 in the test clients and that didn't help. Any ideas?
> Thanks!
>
>
> -Jon
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