General

My Semi-Managed Switch – TL-SG2008

07/10/2016 By Andrew Roderos 1 Comment

I bought three of the TL-SG2008 the same day I bought my EdgeRouter Lite. I’ve always wanted some form of managed switch at home to satisfy my wants and to segregate my lab environment.

In my old setup, I had three unmanaged switches and all-in-one router (with switch and access point built-in). While they worked fine, I wanted some SMB features – LACP, IEEE 802.1Q, etc. That said, I needed to buy some form of managed switches.

I checked for used Cisco Catalyst 3560CG on eBay but they are still expensive. I also checked for used prices of Cisco SMB products and they are also expensive for my needs. By then, I realized that I should look at other vendors.

VMware ESXi Home Lab [2016]

03/19/2016 By Andrew Roderos Leave a Comment

I recently bought an Intel NUC 6th generation (Skylake-based Core i3) as a VMware ESXi host. This is an addition to my existing host that I assembled back in 2012. It has served me well over the years and hoping that it will continue to do so for several more years. Four years old in the computing world is obsolete, but I think it is still a very capable machine for what I use it for. Having said that, it will still be running as another ESXi host.

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How to configure sFlow on Nexus 3000

08/04/2015 By Andrew Roderos Leave a Comment

I mentioned about sFlow in this blog post. Today, I want to show how to configure it on Nexus 3000 series. The configuration lines covered here were tested on both Nexus 3172 and 3048. Nexus 3524/3548 is not sFlow capable so please check the Cisco’s documentation to see if the switch supports it.

What is sFlow?

sFlow, short for sampled flow, is an industry standard sampling technology for monitoring traffic in data networks. It was originally developed by InMon Corporation, maker of Traffic Sentinel – a flow collector, and it is now defined by RFC 3176, for the most part.

Building Your Own Proxy Server

02/18/2013 By Andrew Roderos Leave a Comment

What is a proxy server? According to Wiki page, it is a server that acts as an intermediary for requests from clients seeking resources from other servers. There are many types of proxy servers out there and in this tutorial it will only show one type of it which allows someone to bypass most, if not all, of the poorly designed and/or implemented web content filtering services.

There are many ways to filter websites to avoid employees going to adult, gambling, social networking sites, and etc. The ones that I know of are the following: OpenDNS, Blue Coat, and Websense. While I haven’t been on a network were OpenDNS has been implemented, I’ve been on networks with Blue Coat and Websense appliances. With this tutorial, someone will most likely be successful in bypassing these web content filtering appliances if they are not properly configured or if a firewall is allowing outbound SSH traffic. In organizations where they allow any websites to be accessed, this tutorial can also hide HTTP/HTTPS traffic by encapsulating all of user’s traffic inside SSH, which is encrypted.

IP Netmask Format

02/13/2013 By Andrew Roderos 2 Comments

If you’re following me on Twitter then you might have seen my tweet last week about rebooting my CCIE studies. While I am moving really slow in reading, as usual, I am also taking notes as I go along. I am changing my strategy this time since I don’t retain information like I used to – the joys of getting older.

The chapter 1 of Routing TCP/IP Vol. 1 is really meant to be just a review. If you’re studying for the CCIE, then you’re at the level that you can skip this chapter. However, I’ve decided not to skip this chapter even though I’ve read this book already. Kind of glad that I didn’t skip it because I seem to have forgotten about the ability of Cisco IOS to change the display of the subnet mask. While not really important in CCIE studies, I just thought it is kind of cool to share it with you guys and girls.

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What is sFlow?

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