network connection

[BIG1]

Hi all,

I created a VM with OS :Oracle Linux 6.

Now I can not do anything because Network connection does not work.

I can not ping VMserver (ESXi5). I receive not accessible.

My question is :

How to know if :

-it is a Linux network configuration problem ?

Or

-it is a VM configuration problem ? Something like Bridge or else ?

Thank you.

[JinuV]

1.Make sure you have assign  the VM to proper port group

2.Check the interface link status using "ethtool ethx"

3.Disable the NetworkManager Service # service stop NetworkManager

4.Edit the vi /etc/sysconfig/network-scripts/ifcfg-ethx and entry below details ,remove all other details

DEVICE="ethx"

USERCTL="no"

HWADDR="00:17:A4:77:00:0C"

ONBOOT="yes"

BOOTPROTO="none"

IPADDR=x.x.x.x

NETAMSK=255.255.255.0

GATEWAY=x.x.x.x

4.Restart the Network Service #service restart network.

Thanks & Regards

Jinu Varghese

Please accept as correct answer if it helps

[BIG1]

Thank you.

Here is the output of ethtool (seems Ok ? I have Liked yes)

But when I issu :

service stop NetworkManager

I have :

unknown commande line.

Thanks and regards.

[JinuV]

Send the output of ifconfig

[BIG1]

Thank you.

[root@OracleDB11gR24 ~]# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0C:29:B0:97:D4 

          inet adr:xxx.31.71.168  Bcast:xxx.31.71.255  Masque:255.255.255.0

          adr inet6: fe80::20c:29ff:feb0:97d4/64 Scope:Lien

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:775 errors:0 dropped:0 overruns:0 frame:0

          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 lg file transmission:1000

          RX bytes:46558 (45.4 KiB)  TX bytes:606 (606.0 b)

lo        Link encap:Boucle locale 

          inet adr:127.0.0.1  Masque:255.0.0.0

          adr inet6: ::1/128 Scope:Hôte

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:16 errors:0 dropped:0 overruns:0 frame:0

          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 lg file transmission:0

          RX bytes:960 (960.0 b)  TX bytes:960 (960.0 b)

[JinuV]

Do you have any vlan in your environment,  if there make sure you port  group is vlan tagging and make sure Do have any other VM in the same port group . send the out of netstat -nr

[BIG1]

Thank you.

If Vlan is the LAN between our VMs on ESXi, yes we have with the same IP group address : 192.168.127.XX.

My GATEWAY 192.168.127.254 does not respond to ping. It is not alive then. Should I change this Gateway address ?

here is netstat feedback :

[root@OracleDB11gR24 ~]# netstat -nr

Table de routage IP du noyau

Destination     Passerelle      Genmask         Indic   MSS Fenêtre irtt Iface

192.168.127.0   0.0.0.0         255.255.255.0   U         0 0          0 eth0

Thanks and regards.

[BIG1]

I can not ping for example 192.168.127. 1 even if it is alive (I can connect to it from my vSphere client on my laptop). For pinging 192.168.127.1 I do not need Gateway. Yes ? Then it should be something wrong with my VM configuration not with Linux network configuration.

Thanks.

[JinuV]

As per  your given details your VM  ip  adr is    :xxx.31.71.168  and you are trying to ping 192.168.127.1  ,from this i understood you are trying to ping a different subnet, please follow the below link for better under stand the vmware network. http://rickardnobel.se/vswitch-and-vlan-tagging-part-1/