gsm.asad's profile - activity

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2020-01-25 07:39:53 -0500 commented answer Why cant I see the SRIOV traffic in tcpdump?

I think you're right because we are using Mellanox NICs whose driver does not have this capability

2020-01-23 07:36:07 -0500 commented answer Why cant I see the SRIOV traffic in tcpdump?

Actually this is not possible because the interface is running 64 virtual functions (i.e. 64 VMs) traffic on a single physical interface. Mirroring will create a huge load of packets on CPU.

Main query is - why I am not able to see it?

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2020-01-22 00:20:58 -0500 asked a question Why cant I see the SRIOV traffic in tcpdump?

Hello there

I have 64 VFs (virtual functions) running on a Physical SRIOV nic. When I put a tcpdump on the physical interface (say ens5f0) then I dont see any traffic that is running on virtual functions like icmp, arp, etc. However, I can see some other traffic that is related to physical NIC only. I want to understand why I am not able to see the traffic of VFs on the physical NIC because it must be going via physical NICs only

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2019-09-20 04:57:28 -0500 asked a question Rebooting multiple computes together after a power failure

Hello All In case of a power failure in the datacenter. After power restoration & assuming under-cloud & controller accessible but compute servers are not coming up & require a reboot then, can we reboot multiple compute nodes in one go or they should be one at a time? Has anybody faced this at the site? If yes, then how many can be rebooted together?

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2019-07-25 09:06:24 -0500 commented question How many ports are there (can be created) in an OVS switch?

Thanks Bernd No, this is out of curiosity as I was not able to find the answer in any of the OpenStack documentation

2019-07-25 02:12:07 -0500 asked a question How many ports are there (can be created) in an OVS switch?

Like a physical switch or router which has a maximum limitation of 24 or 48 ports. Is there any maximum limit for the OVS switches like br-int, br-tun, br-ex used in openstack?

2019-07-23 17:00:00 -0500 answered a question No traffic on br-tun

The TAP devices and veth devices are normal Linux network devices and may be inspected with the usual tools, such as ip and tcpdump. Open vSwitch internal devices, such as patch-tun, are only visible within the Open vSwitch environment. If you try to run tcpdump -i patch-tun, it will raise an error, saying that the device does not exist.

It is possible to watch packets on internal interfaces, but it does take a little bit of networking gymnastics. First you need to create a dummy network device that normal Linux tools can see. Then you need to add it to the bridge containing the internal interface you want to snoop on. Finally, you need to tell Open vSwitch to mirror all traffic to or from the internal port onto this dummy port. After all this, you can then run tcpdump on the dummy interface and see the traffic on the internal port.

All this is mentioned in the Openstack network troubleshooting guide

2019-06-18 10:38:06 -0500 received badge  Popular Question (source)
2019-06-13 08:49:19 -0500 asked a question Python learning

I am an openstack support engineer & I want to learn python to automate my daily tasks & also to learn making scripts & understanding scripts better. Please suggest me some good course link if anybody has already done it. I am not a developer so I have to start from basics.

2019-06-13 08:49:19 -0500 asked a question Python learning

I am an openstack support engineer & I want to learn python to automate my daily tasks & also to learn making scripts & understanding scripts better. Please suggest me some good course link if anybody has already done it. I am not a developer so I have to start from basics.