[TriLUG] Networking and Fedora
Ron Kelley
rkelleyrtp at gmail.com
Wed May 26 13:24:31 EDT 2010
SELinux or firewall causing problems?
On May 26, 2010, at 1:22 PM, Joseph Tate wrote:
> Note that I'm trying to route to the host, not a vm guest.
>
> $ brctl show
> bridge name bridge id STP enabled interfaces
> br0 8000.001d0999710f no eth1
> vnet0
> vnet1
> vnet2
> virbr0 8000.000000000000 yes
> $ route -n
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 10.2.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 10.2.2.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
> 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
> 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
> 0.0.0.0 10.2.2.1 0.0.0.0 UG 0 0 0 br0
>
>
> Port forwarding works to several other computers behind the router,
> but does not work to this Fedora 12 box.
>
> On Wed, May 26, 2010 at 12:28 PM, Justis Peters <jtrilug at indythinker.com> wrote:
>> 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
>>>> --
>>>> TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug
>>>> TriLUG FAQ : http://www.trilug.org/wiki/Frequently_Asked_Questions
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>> --
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>>
>
>
>
> --
> Joseph Tate
> Personal e-mail: jtate AT dragonstrider DOT com
> Web: http://www.dragonstrider.com
> --
> TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug
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