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  • Disable IPv6 on Ubuntu

    calendar May 24, 2022 · 1 min read · bash networking ipv6  ·
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    We know we shouldnt do it and we should all embrace IPv6 and move the the future yada yada yada. Dont get me wrong, I'm a hge fan of IPv6 and i think life would be unicorns and rainbows if we were all 100% ipv6, but the nasty realisty is that even in 2022 there are quite a few reason why we cant use it. If you find …


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  • Perform a git squash

    calendar May 24, 2022 · 1 min read · bash networking  ·
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    I needed to copy code from one repo to another removing all prior commits, this did the trick 1git commit -m "Enter commit message for your new initial commit" 2 3# Overwrite the old master branch reference with the new one 4git branch -M new-master master```


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  • Mellanox NIC's on Linux

    calendar Apr 19, 2022 · 1 min read · bash networking mellanox  ·
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    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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  • Add a specific floating IP to a project

    calendar Apr 4, 2022 · 1 min read · openstack networking  ·
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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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  • Linux VLAN interfaces

    calendar May 12, 2021 · 1 min read · bash networking vlan  ·
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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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  • Building an Ubuntu Vagrant box

    calendar Apr 23, 2021 · 2 min read · vagrant networking qemu  ·
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    Within the VM run this to 'pre-configure' it, ready for booting in Vagrant 1wget --no-check-certificate \\ 2 https://raw.githubusercontent.com/hashicorp/vagrant/main/keys/vagrant.pub \\ 3 -O /home/vagrant/.ssh/authorized_keys 4 5sudo rm -f /etc/machine-id 6sudo dbus-uuidgen --ensure=/etc/machine-id 7sudo rm …


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  • Network monitoring tools

    calendar Oct 21, 2020 · 1 min read · linux networking  ·
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    bmon Nethogs Glances Warning dependency heavy


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  • Notes on using nmap

    calendar Apr 29, 2020 · 1 min read · linux networking  ·
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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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  • Ubuntu interfaces file examples

    calendar Feb 27, 2020 · 1 min read · linux networking  ·
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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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  • Backspace in HP\Comware switches

    calendar Jun 13, 2016 · 1 min read · HP COMWARE networking  ·
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    Ctrl+H Link to article


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Cory Hawkvelt

Career Nerd and Open Source Cloud Architect
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