Category Archives: Tools

Google BBR Algorithm

Google’s BBR algorithm for handling TCP traffic congestion could announce a new Era on the trasnport Control Protocol (TCP). Google announced integration with Google Cloud, a cloud hosting platform offered by Google to thousands of companies and which serves millions of websites on a daily basis.

BBR stands for “Bottleneck Bandwidth and RTT (Round-Trip Time),” and is an algorithm for optimizing how network packets travel through servers in order to avoid jamming certain routes.

If you want test this on your linux box, you can follow this guide here https://patchwork.ozlabs.org/patch/671069/

An draft IETF proposal as been made, you check see it here https://tools.ietf.org/html/draft-cheng-iccrg-delivery-rate-estimation-00

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Some DNS Resources Compiled

Working a lot around Response Policy Zone (RPZ) these days, it’s better to start collecting some valuable tools, whitepapers, research, best practises, etc

DNS Servers

Name Description
BIND The most widely used DNS software on the Internet
Bundy Integrated authoritative DNS and DHCP server (the continuation of the BIND 10)
Dnsmasq A lightweight, easy to configure DNS forwarder and DHCP server
Knot DNS Knot DNS is a high-performance authoritative-only DNS server
PowerDNS A versatile nameserver which supports a large number of backends

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Upgrade Cisco Blade Switch

Applying a major upgrade between 12.x and 15.x code, backup your config first before go ahead!

Checking the actual version

 

SW01#sh ver | i IOS
Cisco IOS Software, CBS30X0 Software (CBS30X0-LANBASEK9-M), Version 12.2(35)SE, RELEASE SOFTWARE (fc2)SW01#show boot
BOOT path-list      : flash:cbs30x0-lanbase-mz.122-35.SE/cbs30x0-lanbase-mz.122-35.SE.bin
Config file         : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break        : no
Manual Boot         : no
HELPER path-list    :
Auto upgrade        : yes
Auto upgrade path   :

Downloading and extracting the TAR file from your TFTP

SW01#download-sw tftp:10.1.0.103/cbs30x0-ipbase-tar.150-2.SE6.tar
Loading cbs30x0-ipbase-tar.150-2.SE6.tar from 10.1.0.103 (via FastEthernet0): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(omitted for brevity)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK – 15073280 bytes]

Loading cbs30x0-ipbase-tar.150-2.SE6.tar from 10.1.0.103 (via FastEthernet0): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(omitted for brevity)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
examining image…
extracting info (107 bytes)
extracting cbs30x0-ipbase-mz.150-2.SE6/info (372 bytes)
extracting info (107 bytes)

Stacking Version Number: 1.49

System Type:             0x00000000
Ios Image File Size:   0x00BEF200
Total Image File Size: 0x00E60200
Minimum Dram required: 0x08000000
Image Suffix:          ipbase-150-2.SE6
Image Directory:       cbs30x0-ipbase-mz.150-2.SE6
Image Name:            cbs30x0-ipbase-mz.150-2.SE6.bin
Image Feature:         IP|LAYER_3|MIN_DRAM_MEG=128

Old image for switch 1: unknown

Extracting images from archive into flash…
cbs30x0-ipbase-mz.150-2.SE6/ (directory)
extracting cbs30x0-ipbase-mz.150-2.SE6/info (372 bytes)
cbs30x0-ipbase-mz.150-2.SE6/html/ (directory)
extracting cbs30x0-ipbase-mz.150-2.SE6/html/frmwrkResource.htm (950 bytes)
extracting cbs30x0-ipbase-mz.150-2.SE6/html/menu.shtml (8324 bytes)
extracting cbs30x0-ipbase-mz.150-2.SE6/html/portstats.js (8142 bytes)
(omitted for brevity)
extracting cbs30x0-ipbase-mz.150-2.SE6/cbs30x0-ipbase-mz.150-2.SE6.bin (12505683 bytes)
extracting info (107 bytes)

Installing (renaming): `flash:update/cbs30x0-ipbase-mz.150-2.SE6′ ->
`flash:cbs30x0-ipbase-mz.150-2.SE6′
New software image installed in flash:cbs30x0-ipbase-mz.150-2.SE6

All software images installed.

Boot updated with the new image & Reboot

SW01#show boot
BOOT path-list      : flash:cbs30x0-ipbase-mz.150-2.SE6/cbs30x0-ipbase-mz.150-2.SE6.bin
Config file         : flash:/config.text
Private Config file : flash:/private-config.text
Enable Break        : no
Manual Boot         : no
HELPER path-list    :
Auto upgrade        : yes
Auto upgrade path   :SW01#reload
Proceed with reload? [confirm]

New code is Live!

SW01#sh ver | i IOS
Cisco IOS Software, CBS30X0 Software (CBS30X0-IPBASE-M), Version 15.0(2)SE6, RELEASE SOFTWARE (fc2)

Compare the running config with the Backup one we did previously zero differences, so another successful upgrade!

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Export/Import Putty settings

This method is using registry, so before proceed do a backup of it.

Open command line and type the following command:

regedit /e “%userprofile%\desktop\putty-registry.reg” HKEY_CURRENT_USER\Software\Simontatham

Copy the file generated to the new Windows installation and run it, a prompt window will pop up and click “Yes”. This will merge with config you have for Putty.

export_putty_settings

The following window should appear saying it was imported successfully.

export_putty_settings2

 

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Setup Infoblox IPAM Express on ESXi

You are running out of budget this moment but you really need an IPAM system to manage your IPs (IPv4 and v6) and leave away the old excel which you worked for a long time. For me using or not an IPAM system will depend of the environment size, it’s need to be reasonable and rational.

This free version supports 2000 hosts and multi-discovery, so not bad for a free product

The requirements to run this version from Infoblox are low (1vcpu, 1GB memory, 50GB), and it’s supported in VMware Player, VMware Workstation or VMware Fusion

I’ve tried convert strait away to vSphere 6 but didn’t work, so i started my journey until get this working, and i did it.

First we need to download the free copy, unzipped and use vCenter Converter to convert the image to our environment and play it.

Virtual Machine Properties

These are properties i used to setup my IPAM Express

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Since IPAM Express doesn’t support a fixed IP, you need get a DHCP working for that subnet

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After register you will receive an email like one below, open a browser https://ip-ipam and use credentials and download code provided

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Importing Subnets and Hosts using a CSV file

To import a CSV you will need to respect a strict field format, you can use just a file for subnets and hosts, but i found it insane sometimes. For that reason i imported using different files.

File content subnets.csv

header-network;address*;netmask*;comment;disabled
network;10.1.0.0;255.255.255.0;VLAN1;FALSE
network;10.0.0.0;255.255.255.0;VLAN10;FALSE
network;10.200.50.0;255.255.255.0;VLAN200;FALSE
network;10.100.0.0;255.255.255.0;VLAN100;FALSE
network;200.0.0.0;255.255.255.0;VLAN666;FALSE

File content hosts.csv

header-hostrecord;FQDN;addresses;configure_for_dns
hostrecord;host_NS1;10.1.0.1;FALSE
hostrecord;host_NS2;10.1.0.2;FALSE
hostrecord;Firewall.eth0/0;10.1.0.254;FALSE
hostrecord;FW-DC1_standby.10.0.0.253;10.0.0.253;FALSE
hostrecord;FW-DC1_active.10.0.0.254;10.0.0.254;FALSE
hostrecord;NAS;10.1.0.100;FALSE
hostrecord;DC2;10.1.0.144;FALSE
hostrecord;WSUS;10.1.0.181;FALSE
hostrecord;IPAM;10.1.0.184;FALSE
hostrecord;NAS_NAT;200.0.0.100;FALSE

Click on CSV Import on your left

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Click on + signal

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Select a CSV file to import, you can also use Options to control what you want to change. Press Start :)

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After a successful import, you will see occupation of each subnet

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Click on a subnet 10.1.0.0/24, you can show hosts using an IP Map or List

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Drop me a comment if you need my ova file

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