Honestly I don’t like customized ISO images for VMware ESXi. I prefer to know what software is installed and how to upgrade it. This short guide will show how to integrate HP addons for VMware in the Update Manager (VUM). Open the vClient -> Home -> Update Manager -> Download Settings -> Add Download source: Source […]
(Visited 4 times since 2013-06-04, 4 visits today)
Sometimes after a vSphere upgrade Update Manager (VUM) can fail with the following error: There was an error connecting VMware vSphere Update Manager – [vcenter.example.com:443]. Database temporarily unavailable or has network problems. The easiest way is to reconfigure the VUM using the VMwareUpdateManagerUtility.exe utility installed in the VMware Update Manager program path (usually C:Program Files (x86)VMwareInfrastructureUpdate Manager): […]
(Visited 1 times since 2013-06-04, 1 visits today)
Deploying the VMware vCOPS appliance is an easy task with only one prerequisite: IP pool. An IP pool is IP pools provide a network identity to vApps. An IP pool is a network configuration that is assigned to a network used by a vApp. The vApp can then leverage vCenter Server to automatically provide an […]
(Visited 4 times since 2013-06-04, 4 visits today)
Deploying an OVA to a VMware vSphere infrastructure can fail with the following error: Failed to deploy OVF package: The request was aborted: The request was cancelled. The OVA file can be damaged. Because an OVA file is a TAR, the archive can be tested using 7-Zip. Open the archive, use the verify function and see the […]
(Visited 3 times since 2013-06-04, 3 visits today)
THIS POST IS NOT COMPLETED YET The esxtop utility is probably the most useful utility to troubleshoot a high load on an ESXi host using a CLI. There are eight views: c (default): CPU, sorted by CPU USED by default. d: disk adapter i: interrupt m: memory, sorted by MEMSZ by default. n: network p: power […]
(Visited 73 times since 2013-06-04, 2 visits today)
A not so easy process about QoS involves the verification of end-to-end QoS marking: are the marks maintained through the all network? Before going deep, let’s recap how an IP packet can be marked: The IP field reserved for QoS is 8 bits long and it’s called TOS (Type of Service). RFC791 defines 3 bits for […]
(Visited 166 times since 2013-06-04, 1 visits today)
As described on previous posts both vSwitch and dvSwitch can enforce networking through three policies: Option Default on vSwitch dvSwitch PortGroup Promiscuous mode Reject Reject MAC address changes Accept Reject Forged transmits Accept Reject Let’s describe what each policy can prevent and cannot. Promiscuous mode The promiscuous mode allows a VM to put a vNIC […]
(Visited 195 times since 2013-06-04, 1 visits today)
The vSphere Data Protection appliance allows to backup virtual machines with a built-in tool instead of a third-party backup product. VDP is available on all vSphere editions but Essentials Kit. Moreover VDP can be extended to VDPA (vSphere Data Protection Advanced). Basically VDPA has the same features of VDP, except: VDPA has a per-CPU (socket) license, VDP […]
(Visited 251 times since 2013-06-04, 9 visits today)
I found a Python script to ping a remote system. I added a very short piece of code to print out Jitter and MOS data. # ./ping.py -c 1000 -t 1 -d 8.8.8.8 Statistics for 8.8.8.8: - packet loss: 2 (0.20%) - latency (MIN/MAX/AVG): 46/281/52 - jitter: 2.1583 - MOS: 4.3 A Nagios compatibile output is […]
(Visited 302 times since 2013-06-04, 3 visits today)
The NetFlow protocol was developed by Cisco to collect traffic statistics. An enabled NetFlow device send to a NetFlow receiver a set of flows via UDP protocol. Each NetFlow contains one or more records: Input and output interface index Timestamps Number of bytes and packets observed in the flow Source and destination IP addresses Protocol, source […]
(Visited 300 times since 2013-06-04, 1 visits today)
There is a bug which makes LACP related views inconsistent. Latest 5.5U1 vCenter is still affected Create a LAG interface (dvSwitch -> Settings -> LACP): Now open the “Migrate network traffic to LAGs” and enable lag1 interface as standby port (Manage Distributed Port Groups -> Teaming and failover -> select the port group): Let the process […]
(Visited 163 times since 2013-06-04, 1 visits today)
A very short post about 802.1x (dot1x) on Cisco Catalyst 2950 series. Configure RADIUS and enable dot1x on the switch: aaa authentication dot1x default group radius aaa accounting dot1x default start-stop group radius dot1x system-auth-control Then enable dot1x on all interfaces (additional security commands are added in the example below): interface FastEthernet0/1 switchport mode access […]
(Visited 179 times since 2013-06-04, 1 visits today)
Port mirror is a traditional features available on physical switch to capture port traffic and redirect to a remote destination. A remote destination can be (using the Cisco convention): A physical port located on the same physical switch (Switch port Analyzer or SPAN port). The traffic is simply copied to the destination port too. A physical port […]
(Visited 433 times since 2013-06-04, 5 visits today)
iou-web is released “as-is” without warranty of any kind. iou-web does not include any Cisco IOU/IOL binaries or other materials under Cisco NDA. I’m not responsible for what you do with iou-web software. I DON’T OWN NOR HAVE ACCESS TO TOPOLOGY, INITIAL CONFIGS, IOU/IOL BINARIES OR ANY OTHER MATERIAL UNDER CCIE EXAM NDA OR COPYRIGHTED […]
(Visited 1,429 times since 2013-06-04, 6 visits today)