vCenter is used for managing ESXI host and VM operations via vsphere client Vcenter also provides advanced features like DRS, vSphere HA, Fault Tolerance , vmotion & Storage vMotion and other Vcenter is an appliance either windows or linux based and contain following. 1.Photon OS 2.Postgres DB 3.Vcenter services In this blog we will be…
In NSX-T password reset is done through GRUB menu. By default GRUB menu is not enabled.We need to enable GRUB on root mode.To reset password for NSX-T manager first check the NSX-T version that is being in use. Step1: Enable GRUB menu when you have root password Step2:Reset password once you have GRUB mode enable…
Today we will cover tcpdump tool. Tcpdump is a packet analyzer tool just like wireshark.It run under command line interface. It help you to capture data packets on low level to understand what is going on inside the packet.You can run tcpdump on linux/unix based operating systems. Syntax for tcpdumptcpdump <paramter> e.g tcpdump -i eth0…
1.Nic, Drivers, Stats,vmk,port_num related commands 2.Swtich related commands 3.NIC, vmk, up,down,lacp related commands 4.Module related commands 5.NSX firewall related commands 6.ESX routing related commands 7.VDR,vDL2 related commands 1.Nic, Drivers, Stats,vmk,port_num related commands esxcli network nic list Check the physical vmnic associated with the host. This will show all the vmnic physical adapter and its state.It…
NSX-T upgrade from 3.2.1 to 3.2.2 Today we will perform NSX-T upgrade and its operation. NSX-T upgrade process depends on the number of components you have in your infrastructure. Before proceeding the upgrade you must check the upgrade path and interop matrix with respect to your NSX-T upgrade. Check if the component in your infrastructure…
HAR stands for http archive. This is a file format used to capture network/API information between browsers and web/application server. This is also used for identifying performance issues such as slow load times and page rendering problems etc. The HAR file information is stored in JSON format which means in order to visualize the details…
NSX-T Architecture
Topology So, in this post we will cover the mtu and fragmentation cases. So, every interface/port have its capacity to send data across the line or port. So, the Maximum transfer unit (MTU). When I say MTU it usually means at layer 2 frame, but the actual data formation take place at layer 3. So,…
Gratuitous ARP is either request or reply packet that is needed in some cases. usually when we assigned any ip on interface or host boot the first packet it send is GARP. GARP packet have Sender and Target IP address same .Source mac address is of machine whereas destination mac is broadcast. GARP IMP Question…
TCP Header Format Total 13 Field Learn acronym HSDDDO Acche SE UR WINNER RE PAD FLAG—UPARSF
A route learned by one ibgp peer won’t be advertised to another ibgp peer. This is called BGP split horizon rule. This rule is used to avoid loop in ibgp cases. To mitigate this, we have following option by which one ibgp learned routes can be advertised to another ibgp peer. In this article we…
Topology Address resolution Protocol is used to find the Layer 2( mac address) information when the layer 3(IP) Information is already given. Total 9 filed in Header. The typical Address resolution protocol Header format is shown as below Fig1 ARP_Header
In this scenario router IOU1 already know the outgoing interface as we configured the ip route specifying the outgoing interface. So here IOU1 wil check the routing table and will get the outgoing interface detail in single lookup.
Since the network is Ethernet, the IOU1 must know the L2 address, so it will construct ARP packet having source IP address of PC1 and destination of 30.30.30.2. Source mac of IOU e0/1 interface and DMAC as 0.0.0.0.
OSI Stands for open system interconnection model. This is reference or virtual model, you cannot see it , touch it ,but its exists conceptually just like electron, protons etc. OSI model is invented by ISO(International standard organization). ISO is non profit organization that defines several standards. It is just like other standard e.g ISI mark,…
Topology Summary: To implement Flex VPN or IPSEC VPN the topology shown above. The motive is to make the reachability between LAN to LAN network i.e from 20.20.20.0 to 30.30.30.0 & vice versa. Currently we have configure simple connectivity in which R1 and R2 is reachable to each other via internet cloud. The basic requirement…