network bridge wonkiness
David A. Bandel
david.bandel at gmail.com
Sat Aug 10 10:54:22 PDT 2013
Hey Lonnie,
Just saw this. Did you get this figured out? If not, what does tcpdump on
the bridge interface show? Can you see packets from external hosts coming
in? If so, are they being answered? Are you sure you don't have an IP or
MAC address collision anywhere?
David-
On Tue, Aug 6, 2013 at 4:07 PM, Lonni J Friedman <netllama at gmail.com> wrote:
> I'm attempting to get several virtual machines setup on a Fedora19
> host system, with the traditional bridge network devices (br0, br1,
> etc). I've done this many times before with older versions of Fedora
> (16, 14, etc), and it just works. However, for reasons that I cannot
> figure out, the bridge doesn't seem to be working in Fedora19. While
> I can successfully connect to the outside world (local network +
> internet) from inside a VM, nothing can communicate with the VM from
> outside (local network). I'm referring to something as trivial as
> pinging. From inside the VM, I can ping anything successfully (0%
> packet loss). However, from outside the VM (on the host, or any other
> system on the same network), I see 100% packet loss when pinging the
> IP address of the VM.
>
> My first question is simply, does anyone else have this working
> successfully in F19? And if so, what steps did you need to follow?
>
> I'm not using NetworkManager at all, its all the network service.
> There are no firewalls involved anywhere (iptables & firewall services
> are currently disabled). Here's the current host configuration:
>
> # brctl show
> bridge name bridge id STP enabled interfaces
> br0 8000.38eaa792efe5 no em2
> vnet1
> br1 8000.38eaa792efe6 no em3
> br2 8000.38eaa792efe7 no em4
> vnet0
> virbr0 8000.525400db3ebf yes virbr0-nic
>
> # more /etc/sysconfig/network-scripts/ifcfg-em2
> TYPE=Ethernet
> BRIDGE="br0"
> NAME=em2
> DEVICE="em2"
> UUID=aeaa839e-c89c-4d6e-9daa-79b6a1b919bd
> ONBOOT=yes
> HWADDR=38:EA:A7:92:EF:E5
> NM_CONTROLLED="no"
>
> # more /etc/sysconfig/network-scripts/ifcfg-br0
> TYPE=Bridge
> NM_CONTROLLED="no"
> BOOTPROTO=dhcp
> NAME=br0
> DEVICE="br0"
> ONBOOT=yes
>
> # ifconfig em2 ;ifconfig br0
> em2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
> inet6 fe80::3aea:a7ff:fe92:efe5 prefixlen 64 scopeid
> 0x20<link>
> ether 38:ea:a7:92:ef:e5 txqueuelen 1000 (Ethernet)
> RX packets 100093 bytes 52354831 (49.9 MiB)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 25321 bytes 15791341 (15.0 MiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
> device memory 0xf7d00000-f7e00000
>
> br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
> inet 10.31.99.226 netmask 255.255.252.0 broadcast
> 10.31.99.255
> inet6 fe80::3aea:a7ff:fe92:efe5 prefixlen 64 scopeid
> 0x20<link>
> ether 38:ea:a7:92:ef:e5 txqueuelen 0 (Ethernet)
> RX packets 19619 bytes 1963328 (1.8 MiB)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 11 bytes 1074 (1.0 KiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
>
> Relevant section from /etc/libvirt/qemu/foo.xml (one of the VMs with
> this problem):
>
> <interface type='bridge'>
> <mac address='52:54:00:26:22:9d'/>
> <source bridge='br0'/>
> <model type='virtio'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> </interface>
>
> I can provide additional information, if requested. thanks!
> _______________________________________________
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>
--
Two things are infinite: the universe and human stupidity; and I'm not sure
about the the universe. -- Albert Einstein
Visit my web page at: http://david.bandel.us/
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