Re: [Openstack] question on the GRE Communication
Thanks Robert. On Thu, Mar 14, 2013 at 7:25 PM, Robert van Leeuwen < robert.vanleeu...@spilgames.com> wrote: > > Thanks for the reply. I have one more question. > > How we will check whether the tunneling is established or not? > > tcpdump can show you the GRE traffic: > tcpdump -i ethX proto gre > > Cheers, > Robert > ___ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
Thanks Logan On Thu, Mar 14, 2013 at 7:16 PM, Logan McNaughton wrote: > I'm not sure about verifying the GRE tunnels, so I can't be much help > there. > > As far as understanding how the tunneling happens, GRE is an open > protocol, not specific to OpenStack, or any vendor, and googling GRE should > give you plenty of information about it. > On Mar 14, 2013 5:21 AM, "Aru s" wrote: > >> Hi Logan, >> >> Thanks for the reply. I have one more question. >> How we will check whether the tunneling is established or not? >> I have gone through lot of documents of gre setup and all are says that >> the "ovs-vsctl show" command will show the tunnel info. >> Also is there a doc to understand how the magic happens for tunneling. >> >> Regards, >> Arumon >> >> >> On Tue, Mar 12, 2013 at 6:23 PM, Logan McNaughton wrote: >> >>> For Quantum GRE tunneling, the network node and compute nodes need a NIC >>> on your data network. You assign each of those NIC's an IP (for instance, >>> 192.168.1.1-3). Then (assuming you are using openvswitch with GRE >>> tunneling) you set up your quantum configs. Look at the Quantum >>> administration guide for an example of GRE tunneling with openvswitch. >>> >>> After that you just let it work its magic. All VM traffic is >>> encapsulated inside GRE packets traveling between the nodes, it'll all look >>> like packets in that 192.168.1-3 network. >>> >>> Once the packet reaches its destination node, the GRE encapsulation is >>> removed and the VM packet is read. >>> On Mar 12, 2013 6:36 AM, "Aru s" wrote: >>> Hi, I am trying to configuring openstack with one controller and one network and two compute nodes. I am not able to understand how the communication of the VM's happens which are for the same tenant with same ip range but on the different compute hosts. Please help me to understand how GRE communication happens. Regards, Arumon ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp >> ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
That's the best way I found to see if GRE is up, just watching for two way "proto gre" traffic. Here's how you can match the IP addresses *inside* the GRE packet, which you probably will want. Note that 0x0a050505 is hexadecimal for my desired IP address of 10.5.5.5: root@os-network:~# tcpdump -i eth1 'proto gre and ( ip[58:4] = 0x0a050505 or ip[62:4] = 0x0a050505 )' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 16:18:17.434378 IP os-network-d > os-compute-01-d: GREv0, key=0x0, length 110: IP opskzlp119.snops.net > 10.5.5.5: ICMP echo request, id 21321, seq 488, length 64 16:18:17.436190 IP os-compute-01-d > os-network-d: GREv0, key=0x0, length 110: IP 10.5.5.5 > opskzlp119.snops.net: ICMP echo reply, id 21321, seq 488, length 64 16:18:18.435750 IP os-network-d > os-compute-01-d: GREv0, key=0x0, length 110: IP opskzlp119.snops.net > 10.5.5.5: ICMP echo request, id 21321, seq 489, length 64 16:18:18.437798 IP os-compute-01-d > os-network-d: GREv0, key=0x0, length 110: IP 10.5.5.5 > opskzlp119.snops.net: ICMP echo reply, id 21321, seq 489, length 64 : On Thu, Mar 14, 2013 at 9:55 AM, Robert van Leeuwen < robert.vanleeu...@spilgames.com> wrote: > > Thanks for the reply. I have one more question. > > How we will check whether the tunneling is established or not? > > tcpdump can show you the GRE traffic: > tcpdump -i ethX proto gre > > Cheers, > Robert > ___ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
> Thanks for the reply. I have one more question. > How we will check whether the tunneling is established or not? tcpdump can show you the GRE traffic: tcpdump -i ethX proto gre Cheers, Robert ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
I'm not sure about verifying the GRE tunnels, so I can't be much help there. As far as understanding how the tunneling happens, GRE is an open protocol, not specific to OpenStack, or any vendor, and googling GRE should give you plenty of information about it. On Mar 14, 2013 5:21 AM, "Aru s" wrote: > Hi Logan, > > Thanks for the reply. I have one more question. > How we will check whether the tunneling is established or not? > I have gone through lot of documents of gre setup and all are says that > the "ovs-vsctl show" command will show the tunnel info. > Also is there a doc to understand how the magic happens for tunneling. > > Regards, > Arumon > > > On Tue, Mar 12, 2013 at 6:23 PM, Logan McNaughton wrote: > >> For Quantum GRE tunneling, the network node and compute nodes need a NIC >> on your data network. You assign each of those NIC's an IP (for instance, >> 192.168.1.1-3). Then (assuming you are using openvswitch with GRE >> tunneling) you set up your quantum configs. Look at the Quantum >> administration guide for an example of GRE tunneling with openvswitch. >> >> After that you just let it work its magic. All VM traffic is encapsulated >> inside GRE packets traveling between the nodes, it'll all look like packets >> in that 192.168.1-3 network. >> >> Once the packet reaches its destination node, the GRE encapsulation is >> removed and the VM packet is read. >> On Mar 12, 2013 6:36 AM, "Aru s" wrote: >> >>> Hi, >>> >>> I am trying to configuring openstack with one controller and one network >>> and two compute nodes. >>> I am not able to understand how the communication of the VM's happens >>> which are for the same tenant with same ip range but on the different >>> compute hosts. >>> Please help me to understand how GRE communication happens. >>> >>> Regards, >>> Arumon >>> >>> ___ >>> Mailing list: https://launchpad.net/~openstack >>> Post to : openstack@lists.launchpad.net >>> Unsubscribe : https://launchpad.net/~openstack >>> More help : https://help.launchpad.net/ListHelp >>> >>> > ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
Hi Logan, Thanks for the reply. I have one more question. How we will check whether the tunneling is established or not? I have gone through lot of documents of gre setup and all are says that the "ovs-vsctl show" command will show the tunnel info. Also is there a doc to understand how the magic happens for tunneling. Regards, Arumon On Tue, Mar 12, 2013 at 6:23 PM, Logan McNaughton wrote: > For Quantum GRE tunneling, the network node and compute nodes need a NIC > on your data network. You assign each of those NIC's an IP (for instance, > 192.168.1.1-3). Then (assuming you are using openvswitch with GRE > tunneling) you set up your quantum configs. Look at the Quantum > administration guide for an example of GRE tunneling with openvswitch. > > After that you just let it work its magic. All VM traffic is encapsulated > inside GRE packets traveling between the nodes, it'll all look like packets > in that 192.168.1-3 network. > > Once the packet reaches its destination node, the GRE encapsulation is > removed and the VM packet is read. > On Mar 12, 2013 6:36 AM, "Aru s" wrote: > >> Hi, >> >> I am trying to configuring openstack with one controller and one network >> and two compute nodes. >> I am not able to understand how the communication of the VM's happens >> which are for the same tenant with same ip range but on the different >> compute hosts. >> Please help me to understand how GRE communication happens. >> >> Regards, >> Arumon >> >> ___ >> Mailing list: https://launchpad.net/~openstack >> Post to : openstack@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~openstack >> More help : https://help.launchpad.net/ListHelp >> >> ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] question on the GRE Communication
For Quantum GRE tunneling, the network node and compute nodes need a NIC on your data network. You assign each of those NIC's an IP (for instance, 192.168.1.1-3). Then (assuming you are using openvswitch with GRE tunneling) you set up your quantum configs. Look at the Quantum administration guide for an example of GRE tunneling with openvswitch. After that you just let it work its magic. All VM traffic is encapsulated inside GRE packets traveling between the nodes, it'll all look like packets in that 192.168.1-3 network. Once the packet reaches its destination node, the GRE encapsulation is removed and the VM packet is read. On Mar 12, 2013 6:36 AM, "Aru s" wrote: > Hi, > > I am trying to configuring openstack with one controller and one network > and two compute nodes. > I am not able to understand how the communication of the VM's happens > which are for the same tenant with same ip range but on the different > compute hosts. > Please help me to understand how GRE communication happens. > > Regards, > Arumon > > ___ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > > ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
[Openstack] question on the GRE Communication
Hi, I am trying to configuring openstack with one controller and one network and two compute nodes. I am not able to understand how the communication of the VM's happens which are for the same tenant with same ip range but on the different compute hosts. Please help me to understand how GRE communication happens. Regards, Arumon ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
