By:
On:
In: AI
With: 0 Comments

Preparation C:\> pip install pyangCollecting pyangDownloading https://files.pythonhosted.org/packages/5e/b4/4f1937f18914b847168ea596b77e04d75d28ff937ecc4ac7da210b17ad78/pyang-2.1.1-py2.py3-none-any.whl (572kB)100% |████████████████████████████████| 573kB 3.6MB/sCollecting lxml (from pyang)Downloading https://files.pythonhosted.org/packages/aa/17/b9ccbdd50f66258d362561dbfe3cf4aaa60c82c4bba0302b3f52ab730b99/lxml-4.4.2-cp37-cp37m-win_amd64.whl (3.7MB)100% |████████████████████████████████| 3.7MB 5.2MB/sInstalling collected packages: lxml, pyangSuccessfully installed lxml-4.4.2 pyang-2.1.1You are using pip version 10.0.1, however version 20.0.1 is available.You should consider upgrading via the ‚python -m pip install –upgrade pip‘ command. C:\> python -m pip install –upgrade pipCollecting pipDownloading https://files.pythonhosted.org/packages/57/36/67f809c135c17ec9b8276466cc57f35b98c240f55c780689ea29fa32f512/pip-20.0.1-py2.py3-none-any.whl (1.5MB)100% |████████████████████████████████| 1.5MB 7.0MB/sInstalling collected packages: pipFound existing installation: pip 10.0.1Uninstalling pip-10.0.1:Successfully uninstalled pip-10.0.1Successfully installed pip-20.0.1 C:\cd labC:\LAB>cd GIT C:\LAB\GIT> git clone https://github.com/YangModels/yang.gitCloning into ‚yang’…remote: Enumerating objects: 19, done.remote: Counting objects: 100% (19/19), done.remote: Compressing objects: 100% (16/16), done.remote: Total 30728 (delta 6), reused 12 (delta 3), pack-reusedRead More →

By:
On:
In: Windows
With: 0 Comments

The default-MTU allows max. 1472-byte sized ping-packets to be sent (28 Bytes will always get added: 20 Byte IPv4-Header, 8 Byte ICMP-Header). If you want to test the max. MTU of the LAN, you have to modify the IP-MTU of the Windows-NIC. List all Interfaces C:\>netsh interface ipv4 show interfaces Idx Met MTU State Name— ———- ———- ———— —————————1 75 4294967295 connected Loopback Pseudo-Interface 127 55 1500 disconnected WLAN12 25 1500 disconnected Local Area Connection* 98 25 1500 disconnected Local Area Connection* 104 5 1500 disconnected ETH_DELL23 25 1500 connected VirtualBox_Host313 25 1500 connected ETH_DOCK24 25 1500 connected VirtualBox_Host111 25 1500 connected VirtualBox_Host29 25 1500Read More →

By:
On:
In: Uncategorized
With: 0 Comments

more than ten years later (IEEE 802.1ax-2008), but everybody calls it 802.3ad and serverguys still prefer static bonding with round-robin distribution [without telling network admins about that decision] to confuse (or tear down) ethernet-networks. What a stupid default: default bond0 interface with balance round robin mode Awsome 🙂 FWM-2-STM_LOOP_DETECT How a single server affects vMotion, SLB-VIP-Mobility, First-Hop Redundancy-Protocols (VRRP, HSRP you name it) in 2019. I won’t expect technology like software-defined-networks to solve human ignorance.Read More →

By:
On:
In: Cloud
With: 0 Comments

2/3/4-Node Cluster no Fabric-Interconnects (FIs) Edge-Servers connected to LAN-Switches „back-to-Back“-Option for 2-Node Cluster only „RF2“-redundancy    Read More →

By:
On:
In: Cloud
With: 0 Comments

Beitrag ansehen Performance All-NVMe Cluster HyperFlex Acceleration Engine  Scaliabilty 2:1 Compute-to-Converged Nodes-Ratio Data Protection Stretched Cluster (Metro Availability) „Cisco HyperFlex Premier“-Cisco Data Center Enterprise Agreement TierRead More →

By:
On:
In: Cloud
With: 0 Comments

Use-Case Investment-Protection VM-Migration Fibre-Channel   Ethernet iSCSI FCoE FC-Setup VSAN WWNN/WWPN-Pool vHBA templates FC-SAN Zoning / LUN-Masking FC-Switch Directly connected FC-Storage supported zoning within UCS-FI HyperFlex SAN Connectivity Policy iSCSI Setup VLAN MAC-Pool/vNIC-Template(s) HyperFlex LAN-Connectivity Policy  Read More →

By:
On:
In: automation, Scripting
With: 0 Comments

The existing Windows-Comman-Script has been enhanced so it now waits until the Router-VM is up got an IP-Address assigned using DHCP. For Demonstration-Purposes an SSH-Connection will be established. The public-key of my laptop-ssh-client is part of the slipstreamed Router-Configuration. Deploy a Router-VM with hostname „CSY“. Establish an SSH-Connection to the discovered Router-IP: Have a look to the startup-config used: This is the „CMD“-Script used:Read More →

By:
On:
In: automation, Scripting
With: 0 Comments

The following version adds a „-c“ option: „Connected IP-Address“-Check. the script exits, when the Router-VM is up and running and has an usable IP-Address The Script still checks all CDP-Packets received at the specified Interface: If the Sender has the correct „Hostname“ it reads the CDP-Management-IP-Address announced. This IP-Address has to be within the IP-Range of any connected IP-Network at the specified Interface. So it’ll be possible to establish a SSH-Session to the router-VM.Read More →

By:
On:
In: Scripting, Windows
With: 0 Comments

You got the task to generate a list of IP-Networks connected to LAN „VirtualBox Host-Only Network“. There might be more than one IP-Network. Use Scapy to crawl through all Interfaces and get the human-readable interface name [only required for windows users]. Use NetIfaces to get a list of IP-Addresses connected to this interface. Use IPAddress to calculate the IP-Network(s) directly connected. In my case, only one subnet is directly connected: 192.168.56.0/24Read More →