Category Archives: Networking

Using Nginx as a load balancer

Here’s a look at how nginx does basic load balancing : Basic http load balancing: This configuration will send 50% of the requests for www.yoursite.com to yoursite1.yoursite.com and the other 50% to yoursite2.yoursite.com. upstream yoursite { serve...

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BIG-IP F5 Client SSL Profile to Accept TLS 1.0 and forward as TLS 1.2

The F5 can be configured to allow a TLS 1.0 connection and forward it as TLS 1.2 to servers behind the VIP. This is really useful if you have an application running on an older system like Windows 2003 that … Continue reading →...

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Determine the TLS cipher suite used in a 3-Way SSL handshake

When using Microsoft Network Monitor 3.4 you can determine the cipher suite used in a 3-Way SSL handshake by inspecting the “Server Hello” frame. Specifically drill down to “TLSCipherSuites” section. Filter that shows you a 3-...

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Load balance an HTTPS web site with BIG-IP F5

I have configured an Active/Standby BIG-IP F5 pair in my other post, you can take a look at the network configuration there. This post will walk you through setting up a basic load balancer between two web servers in my … Continue reading &rar...

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Configure an Active/Standby pair BIG-IP F5 Load Balancer in VMware Workstation (12.1.4-0.0.8)

I finally found some time to Deploy and Configure an F5 Load Balancer in my VMware Workstation LAB. The below steps will walk you through setting up an Active/Standby pair HA configuration for BIG-IP F5 LTM 12.1.4-0.0.8. To get a … Continue re...

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Configure an Active/Standby pair Big-IP F5 Load Balancer in VMware Workstation (13.1.1-0.04)

I finally found some time to Deploy and Configure an F5 Load Balancer in my VMware Workstation LAB. The below steps will walk you through setting up an Active/Standby pair HA configuration for BIG-IP F5 13.1.1-0.0.4. The whole set up … Continu...

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Batch script to capture the IP of a rotating DNS record

Here is a script I wrote to capture a rotating IP address of a DNS A record. This is usually pretty common with Akamai or Cloudflare DNS servers where an IP for a DNS record will change randomly for security, … Continue reading →...

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How can I see Time-To-Live (TTL) for a DNS record?

There are two ways that you can query a TTL value for a DNS record. You can use nslookup with the the -q=wks option. You can also view the TTL value in the local “DNS Resolver Cache” on the local … Continue reading →...

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Microsoft Network Monitor 3.4 Network capture filters

I’m a big fan of WireShark but recently found myself using Microsoft Network Monitor more as we have it installed on a lot of Web servers. Here is a list of filters that i found useful. Some of these filters … Continue reading →...

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Blocking an IP without a Windows firewall route NULL

Blocking an Outbound connection I have ran into a situation where a server was sending malformed requests to another server. The Windows firewall was turned off on this server, I did not want to turn it on as there is … Continue reading →...

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