IP Conflict on Container

[cjkeeme]

I'm sure I'm missing something very simple, but I believe I have followed the wiki exactly in regards to setting up a network model using a routed configuration.

I'm preparing my server to be hosted in a data facility and will want proxmox to be on a static IP and each subsequent KVM guest to be on a separate static IP. For the time being I'm attempting to setup the routed configuration using private IPs so I can still access everything prior to being hosted.

The problem I am having is that the one KVM guest I have setup right now as 10.0.5.71 is sending me to the proxmox panel.

Here is what I am trying to accomplish:

10.0.5.70 -> proxmox panel
10.0.5.71-74 -> KVM guest VMID: 101-104

Here is what my /etc/network/inferfaces looks like:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address  10.0.5.70
        netmask  255.255.255.0
        gateway  10.0.5.1
        post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp


auto vmbr0
iface vmbr0 inet static
        address  10.0.5.71
        netmask  255.255.255.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0

Here is the output of ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:22:19:65:f2:32
          inet addr:10.0.5.70  Bcast:10.0.5.255  Mask:255.255.255.0
          inet6 addr: fe80::222:19ff:fe65:f232/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4305 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4753 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:765004 (747.0 KiB)  TX bytes:4129449 (3.9 MiB)
          Interrupt:37 Memory:ec000000-ec012800

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3659 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3659 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:807530 (788.6 KiB)  TX bytes:807530 (788.6 KiB)

venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00                     -00
          UP BROADCAST POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

vmbr0     Link encap:Ethernet  HWaddr ba:b8:c1:75:eb:6f
          inet addr:10.0.5.71  Bcast:10.0.5.255  Mask:255.255.255.0
          inet6 addr: fe80::b8b8:c1ff:fe75:eb6f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

vmtab101i0 Link encap:Ethernet  HWaddr 00:ff:0c:e2:05:f2
          inet6 addr: fe80::2ff:cff:fee2:5f2/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:50 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:9512 (9.2 KiB)  TX bytes:782 (782.0 B)

Here is the output of route -n:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.5.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.0.5.0        0.0.0.0         255.255.255.0   U     0      0        0 vmbr0
0.0.0.0         10.0.5.1        0.0.0.0         UG    0      0        0 eth0

 

[udo]

Hi,
try

auto eth0
iface eth0 inet static
        address  0.0.0.0
        netmask  0.0.0.0


auto vmbr0
iface vmbr0 inet static
        address  10.0.5.70
        netmask  255.255.255.0
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

Udo

 

[cjkeeme]

Thanks for the suggestion udo, but that certainly did not work. I lost connection entirely using this and had to login and edit /etc/network/interfaces directly from the proxmox box in order to change to what I had before. As I followed the wiki, my mistake must be relatively minor.

 

[udo]

Thanks for the suggestion udo, but that certainly did not work. I lost connection entirely using this and had to login and edit /etc/network/interfaces directly from the proxmox box in order to change to what I had before. As I followed the wiki, my mistake must be relatively minor.

Hi,
your config is wrong!
You defined a bridge without any network, but with an ip which is in the same network like eth0. And the brigde-network-ip do you want to use in a vm - this can't work.
In my example i copied your config - it's missed the gateway entry on vmbr0.

When you take my config with the gateway-entry and reboot, you should reach your proxmoxhost on 10.0.5.70 and for the VMs proxmox define devices:

vmtab101i0 Link encap:Ethernet  Hardware Adresse 42:ce:86:af:77:21  
          inet6-Adresse: fe80::40ce:86ff:feaf:7721/64 Gültigkeitsbereich:Verbindung
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metrik:1
          RX packets:63649652 errors:0 dropped:0 overruns:0 frame:0
          TX packets:166884015 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:0 Sendewarteschlangenlänge:500 
          RX bytes:32353094457 (30.1 GiB)  TX bytes:242649719392 (225.9 GiB)

Udo

 

[cjkeeme]

I got it. Thanks udo.

 

[cjkeeme]

Okay it seems I'm still having a little trouble. Maybe if I ask the question in this way I will understand better what I'm suppose to do.

I have 5 static IPs assigned to me. What numbers should go below for eth0 and vmbr0:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address  192.168.10.2              <-----Do one of my static IPs go here
        netmask  255.255.255.0
        gateway  192.168.10.1
        post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp


auto vmbr0
iface vmbr0 inet static                        
        address  10.10.10.1                   <-----Does another static IP go here  (Same one as above or a different one)
        netmask  255.255.255.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0

I pulled this example straight from the wiki. It's my understanding that vmbr0 probably should not be bridged with eth0 in a data center. The example above from udo has me bridge vmbr0 with eth0.

 

[cjkeeme]

Can an admin take a look at my previous post? I'm due to take my proxmox server to the data facility tomorrow.

Thanks.