[TriLUG] Networking and Fedora

[Justis Peters]

Are you doing anything special with your routing tables? Is it just a
single default gateway? Can you ping the VM from the gateway itself?

Have you tried port forwarding to any other hosts, preferably ones with
simpler networking configs? Port forwarding to the virtualization host
would be great, because that would confirm half the path.

Can you give us the output of "brctl show", just to make sure it's sane?

Also, check the MTU on the VM to make sure that it's no longer than the
1500 that's set on br0. You may also want to research what the proper
setting is for "checksum offloading" via ethtool. I'm not sure what the
recommended path is on KVM, but I had to disable it on my Xen domUs in
order to resolve intermittent networking failures.

I'll be offline for a few hours, because I'm going to watch the NC
Senate's Finance Committee meeting. They're supposed to vote on S1209
today and I'm there to oppose it. The proposed bill would stifle
attempts at municipal broadband infrastructure, by requiring all
financing to go through general obligation bonds via a ballot measure in
a general election.

Kind regards,
Justis

Joseph Tate wrote:
> Using KVM, guests are bridged:
>
> br0       Link encap:Ethernet  HWaddr 00:1D:XX:XX:XX:XX
>           inet addr:10.2.2.8  Bcast:10.2.2.255  Mask:255.255.255.0
>           inet6 addr: fe80::21d:9ff:fe99:710f/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1676072 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:74716 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:554784107 (529.0 MiB)  TX bytes:10909168 (10.4 MiB)
>
> eth0      Link encap:Ethernet  HWaddr 00:07:XX:XX:XX:XX
>           inet addr:10.2.2.4  Bcast:10.2.2.255  Mask:255.255.255.0
>           inet6 addr: fe80::207:e9ff:fe0f:4c39/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:9110464 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:13503488 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:846113634 (806.9 MiB)  TX bytes:17866625825 (16.6 GiB)
>
>
> On Wed, May 26, 2010 at 11:44 AM, Justis Peters <jtrilug at indythinker.com> wrote:
>   
>> What are you using for virtualization and how is its networking
>> configured between the host network and guest VMs? Bridged? Routed? NAT?
>>
>> Kind regards,
>> Justis
>> --
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