Question about network configuration

[redi78]

Hi,

i am a newbie in such things like virtualisation and have a question. I use a Zywall USG 20 and created a DMZ with e.g. 192.168.10.1.
The Proxmox hosts IP adress ist 192.168.10.5.
I created an CT (Ubuntu Server). So now should i our venet or bridged mode?

Regards,
redi78

 

[RRJ]

I prefer to use bridged mode to simplify my setups.

 

[redi78]

OK, so i created the container in bridged mode. I start the virtual machine but can not connect via the console.


What is wrong?

 

[RRJ]

If you are using containers, it is not that easy to use console to connect to them. Look for solution on Proxmox Wiki.
If you want to go inside the container, just login via ssh in Proxmox VE and use these commands:

vzllist -a
this will show all containers running under OpenVZ
vzctl enter #containernumberhere

There is no connection between the problem you mentioned and networking.

 

[m.ardito]

if the proxmox host is 192.168.10.5
and the ct inside it has 192.168.3.5

there are different networks... ?

Marco

 

[redi78]

ah, now i am on the virtual machine. But it seems that something is wrong with the network configuration.

 

[RRJ]

I think, that he just didn't know that IP addresses are visible on screenshots and wanted to hide or be more abstracted from the numbers. Look at the SS with bridge. there is 192.168.3.0/24 configured. Or may be tehre are multiple interfaces.

 

[RRJ]

sure. your interface is not up.
set it up in
/etc/network/interfaces like you wold do it in usual physical machine.

in example:
auto eth0
interface eth0 inet static
address 192.168.3.12
netmask 255.255.255.0
gateway 192.168.3.1

save and run
ifup eth0

 

[redi78]

no problem...it´s just a test host.
promox host is 192.168.3.5
ct created with bridged mode. but ifconfig says that there is no ip. network is unreachable.

 

[RRJ]

http://forum.proxmox.com/threads/19087-Question-about-network-configuration?p=97890#post97890

 

[redi78]

http://forum.proxmox.com/threads/19087-Question-about-network-configuration?p=97890#post97890

ok, interface is up but i have no internet connection. what are the next steps to analyze the problem?

 

[RRJ]

are you able to ping the default gateway?

 

[redi78]

i can ping the proxmox host 192.168.3.5 but the dmz gateway not 192.168.3.1 not.

 

[redi78]

root@rdssrv3:/# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

 

[RRJ]

sysctl net.ipv4.ip_forward is ?

 

[redi78]

sysctl net.ipv4.ip_forward is ?

yes:
root@rdssrv3:/# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1

 

[redi78]

Ah, it is possible to ping another server in that network, so could it be a problem with the zywall?

 

[RRJ]

sure it can be. zywall is a firewall and you have to create rules to allow traffic from and in DMZ zone

 

[redi78]

sure it can be. zywall is a firewall and you have to create rules to allow traffic from and in DMZ zone

Ah so neu i can reach the internet. perfekt. But there is only one issue. On every restart of the virtual machine i have to do ifup eth0 for
initialize the network. why?

 

[RRJ]

hehe. It's Ubuntu template. Don't use Ubuntu as VZ container. Don't know why, but they are always halfdone or smth. I had same problem far way ago, check this thread out. There are some solutions.
http://forum.proxmox.com/threads/3738-OpenVZ-container-networking-trouble

If you want to use Ubuntu, create a VM using KVM. It will be much more stable.

But better use Debian, its always better