A while back I had to configure a bunch of servers with Mellanox Connect-X 4 NIC's to talk to an ethernet Switch(Dell S6000-ON to be exact) and the NIC's that my customer had fitted not only had really old firmware but they were also in Infiniband(I think) mode, not Ethernet. So i had to do some legwork.. First job was …

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I use this script to assign a specific Public IP address to a designated tenancy, in my environment we have multiple public subnets on the single Public network and one of those subnet's is owned by a reseller we work with, so only they have access to this set of IP's 1export PROJECT_ID=$1 2export IP_ADDRESS=$2 3source …

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Lets create a VLAN sub interface on a physical interface eth0 then add this new vlan subinterface eth0.10 to a new bridge br10 We might want to do this so that VM's running on this host have access to this VLAN 1ip link add link eth0 name eth0.10 type vlan id 10 2ip link set dev eth0.10 up 3brctl addbr br10 4brctl …

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Within the VM run this to 'pre-configure' it, ready for booting in Vagrant 1wget --no-check-certificate \\ 2https://raw.githubusercontent.com/hashicorp/vagrant/main/keys/vagrant.pub \\ 3-O /home/vagrant/.ssh/authorized_keys 45sudo rm -f /etc/machine-id 6sudo dbus-uuidgen --ensure=/etc/machine-id 7sudo rm …

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bmon Nethogs Glances Warning dependency heavy

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Nmap Scan subnet for PTR's When you need to scan an entire subnet for 'research purposes' and check for any associated PTR's we can use Nmap   nmap -R -sL 103.112.200.0/22 > results.txt

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Example 1 - Includes some static routes and manually specified IP's auto lo iface lo inet static address 103.90.59.9/32 auto ens3 iface ens3 inet static address 172.2.1.17 network 172.2.1.0 netmask 255.255.254.0 up route add -net 172.2.0.0 netmask 255.255.0.0 gw 172.2.1.1 up route add -net 172.2.0.0 netmask 255.255.0.0 …

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