# Network problem connecting from other hosts

**URL:** <https://forum.opennebula.io/t/network-problem-connecting-from-other-hosts/5033>\
**Category:** Product Support\
**Created:** [October 1, 2017, 10:43pm UTC](https://forum.opennebula.io/t/network-problem-connecting-from-other-hosts/5033 "2017-10-01T22:43:00Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Thunderlight1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/thunderlight1/32/5374_2.png) [@Thunderlight1](https://forum.opennebula.io/u/Thunderlight1)\
**Post date:** [October 1, 2017, 10:43pm UTC](https://forum.opennebula.io/t/network-problem-connecting-from-other-hosts/5033/1 "2017-10-01T22:43:00Z")

</div>

I have installed Opennebula 5.4.1 and configured two network bridges on the nodes. I then initiate an Ubuntu instance which gets an IP. I can’t ping the virtual machine from any other node except from the node where it was created. All the firewalls are turned off on all machines.  
Please see details bellow:

> ```
> **Nebula1**
> cesar@nebula1:~$ brctl show
> bridge name	bridge id STP enabled	interfaces
> br0 8000.080027bfd3ee	no enp0s3
> br1 8000.0800271e6246	no enp0s8
> virbr0 8000.525400c91dfd	yes virbr0-nic
> 
> cesar@nebula1:~$ ip a
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> valid_lft forever preferred_lft forever
> 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP group default qlen 1000
> link/ether 08:00:27:bf:d3:ee brd ff:ff:ff:ff:ff:ff
> 3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br1 state UP group default qlen 1000
> link/ether 08:00:27:1e:62:46 brd ff:ff:ff:ff:ff:ff
> 6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
> link/ether 52:54:00:c9:1d:fd brd ff:ff:ff:ff:ff:ff
> inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
> valid_lft forever preferred_lft forever
> 7: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
> link/ether 52:54:00:c9:1d:fd brd ff:ff:ff:ff:ff:ff
> 8: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
> link/ether 08:00:27:bf:d3:ee brd ff:ff:ff:ff:ff:ff
> inet 192.168.1.65/24 brd 192.168.1.255 scope global br0
> valid_lft forever preferred_lft forever
> 9: br1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
> link/ether 08:00:27:1e:62:46 brd ff:ff:ff:ff:ff:ff
> inet 10.10.10.11/24 brd 10.10.10.255 scope global br1
> valid_lft forever preferred_lft forever
> 
> ```

> \*\* Nebula2 \*\*
> 
> cesar@nebula2:~$ brctl show  
> bridge name bridge id STP enabled interfaces  
> br0 8000.0800277942a5 no enp0s3  
> one-23-0  
> br1 8000.0800275e3a5d no enp0s8  
> virbr0 8000.52540062db83 yes virbr0-nic
> 
> cesar@nebula2:~$ ip a  
> 1: lo: \<LOOPBACK,UP,LOWER\_UP\> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1  
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  
> inet 127.0.0.1/8 scope host lo  
> valid\_lft forever preferred\_lft forever  
> 2: enp0s3: \<BROADCAST,MULTICAST,UP,LOWER\_UP\> mtu 1500 qdisc pfifo\_fast master br0 state UP group default qlen 1000  
> link/ether 08:00:27:79:42:a5 brd ff:ff:ff:ff:ff:ff  
> 3: enp0s8: \<BROADCAST,MULTICAST,UP,LOWER\_UP\> mtu 1500 qdisc pfifo\_fast master br1 state UP group default qlen 1000  
> link/ether 08:00:27:5e:3a:5d brd ff:ff:ff:ff:ff:ff  
> 6: virbr0: \<NO-CARRIER,BROADCAST,MULTICAST,UP\> mtu 1500 qdisc noqueue state DOWN group default qlen 1000  
> link/ether 52:54:00:62:db:83 brd ff:ff:ff:ff:ff:ff  
> inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0  
> valid\_lft forever preferred\_lft forever  
> 7: virbr0-nic: \<BROADCAST,MULTICAST\> mtu 1500 qdisc pfifo\_fast master virbr0 state DOWN group default qlen 1000  
> link/ether 52:54:00:62:db:83 brd ff:ff:ff:ff:ff:ff  
> 11: br0: \<BROADCAST,MULTICAST,UP,LOWER\_UP\> mtu 1500 qdisc noqueue state UP group default qlen 1000  
> link/ether 08:00:27:79:42:a5 brd ff:ff:ff:ff:ff:ff  
> inet 192.168.1.66/24 brd 192.168.1.255 scope global br0  
> valid\_lft forever preferred\_lft forever  
> 12: br1: \<BROADCAST,MULTICAST,UP,LOWER\_UP\> mtu 1500 qdisc noqueue state UP group default qlen 1000  
> link/ether 08:00:27:5e:3a:5d brd ff:ff:ff:ff:ff:ff  
> inet 10.10.10.12/24 brd 10.10.10.255 scope global br1  
> valid\_lft forever preferred\_lft forever  
> 13: one-23-0: \<BROADCAST,MULTICAST,UP,LOWER\_UP\> mtu 1500 qdisc pfifo\_fast master br0 state UNKNOWN group default qlen 1000  
> link/ether fe:00:c0:a8:01:7d brd ff:ff:ff:ff:ff:ff

```
> cesar@nebula2:~$ sudo systemctl status ufw
> ● ufw.service - Uncomplicated firewall
> Loaded: loaded (/lib/systemd/system/ufw.service; disabled; vendor preset: ena
> Active: inactive (dead)

```

\*\* Frontend-server \*\*

```
> oneadmin@front1:/home/cesar$ onevnet show Internet
> VIRTUAL NETWORK 6 INFORMATION                                                   
> ID : 6                   
> NAME : Internet            
> USER : oneadmin            
> GROUP : oneadmin            
> CLUSTERS : 0                   
> BRIDGE : br0                 
> VN_MAD : dummy               
> USED LEASES : 1                   
> 
> PERMISSIONS                                                                     
> OWNER : um-                 
> GROUP : ---                 
> OTHER : ---                 
> 
> VIRTUAL NETWORK TEMPLATE                                                        
> BRIDGE="br0"
> DNS="192.168.1.4"
> GATEWAY="192.168.1.1"
> NETWORK_ADDRESS="192.168.1.125"
> NETWORK_MASK="255.255.255.0"
> PHYDEV=""
> SECURITY_GROUPS="0"
> VLAN_ID=""
> VN_MAD="dummy"
> 
> ADDRESS RANGE POOL                                                              
> AR 0                                                                            
> SIZE : 25                  
> LEASES : 1                   
> 
> RANGE FIRST LAST
> MAC 02:00:c0:a8:01:7d 02:00:c0:a8:01:95
> IP 192.168.1.125 192.168.1.149
> 
> 
> LEASES                                                                          
> AR OWNER MAC IP IP6
> 0 V:23 02:00:c0:a8:01:7d 192.168.1.125 -
> 
> VIRTUAL ROUTERS

oneadmin@front1:/home/cesar$ onetemplate show 11
TEMPLATE 11 INFORMATION                                                         
ID : 11                  
NAME : Ubuntu 16.04 - KVM  
USER : oneadmin            
GROUP : oneadmin            
REGISTER TIME : 10/01 23:53:36      

PERMISSIONS                                                                     
OWNER : um-                 
GROUP : ---                 
OTHER : ---                 

TEMPLATE CONTENTS                                                               
CONTEXT=[
  NETWORK="YES",
  SSH_PUBLIC_KEY="$USER[SSH_PUBLIC_KEY]" ]
CPU="1"
DISK=[
  IMAGE_ID="13" ]
GRAPHICS=[
  LISTEN="0.0.0.0",
  TYPE="vnc" ]
LOGO="images/logos/ubuntu.png"
MEMORY="768"
OS=[
  ARCH="x86_64" ]

```

---

<div class="post-metadata">

**Author:** ![marcindulak](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@marcindulak](https://forum.opennebula.io/u/marcindulak)\
**Post date:** [October 2, 2017, 8:13am UTC](https://forum.opennebula.io/t/network-problem-connecting-from-other-hosts/5033/2 "2017-10-02T08:13:31Z")

</div>

Looks similar to [https://forum.opennebula.io/t/trouble-with-networking-after-successul-install/](https://forum.opennebula.io/t/trouble-with-networking-after-successul-install/)

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<div class="post-metadata">

**Author:** ![Thunderlight1](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/thunderlight1/32/5374_2.png) [@Thunderlight1](https://forum.opennebula.io/u/Thunderlight1)\
**Post date:** [October 3, 2017, 7:01pm UTC](https://forum.opennebula.io/t/network-problem-connecting-from-other-hosts/5033/3 "2017-10-03T19:01:14Z")

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Probably is. I tried to have it working according to the instruction, but failed. So I installed it on CentOS instead. Thanks for the help.