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Networking Protocols

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functional...

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Network and Security Engineer

A network security and systems engineer with over 12 years of experience in the field, ready to help and share my knowledge with others.


It’s not the Network, It’s DNS

This is the first one of a series of articles I’ll be writing to address technical issues that are always referred to as network problems. The network boundaries have changed, therefore having an understanding of how each piece in the network  puzzle works will help troubleshoot any network issue.

There's been a lot of discussion lately about Net Neutrality…

There's been a lot of discussion lately about Net Neutrality
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If my FTPS server is setup for Implicit FTPS, port 990, will other companies have to have port 990 open?

I recently setup an FTPS server that requires Implicit SSL, port 990.  I imagine other companies …
Troubleshooting Solution

VPN Tunnels are up. But no information comes through, until you reset the VPN tunnels. Firewall bug?

Hi guys
We have VPN tunnels between ourselves and Amazon AWS. They're up and running. Our side has a …
Troubleshooting Solution

OSPF Using Cost to Prefer a Path

On my ASA firewall of the network I took over there are two default routes of equal cost - one to …
Troubleshooting Solution

Cisco ASA static routes and metric

On my Cisco ASA I want to have a preferred and a backup route to (example)
Would I make use …
Troubleshooting Solution

My domain can not be found.

Hi, I am told by friends that My domain can not be found. So, what places must I register my domain? …
Troubleshooting Solution

Unable to copy file directly via UNC, but I can if I go through a different PC

Confusing enough title?  Hopefully my explanation will be clearer.

There is a scheduled task that …
Troubleshooting Solution

Add Second IP Address to Network Adaptor on Ubuntu 16.4

I need to add a second ip address to my network adaptor on Ubuntu 16.4

This makes it temporary
# ip …
Troubleshooting Solution

Having issues communicating with remote sites over the QMOE

I have a DELL 6248p that is connected to our QMOE sites.  I have a 1gig fiber that goes right into …
Troubleshooting Solution

Issue to telnet

Port 25 is open but I've got the following. Any advice?
Troubleshooting Solution

Host nic vs SAN nic


I read that if: SAN uses FC then Host nic should be in FC or FCoE

What about if SAN uses ISCSI, …
Troubleshooting Solution

ExaBGP - Juniper MX  internal bgp - router passing community to external BGP

Hello ,

We are using an ExaBGP server to send dynamic updates to the Juniper MX80 Router.
Blackhole …
Troubleshooting Solution

YAF for dummies

I would like someone to show me a link or give me a good explanation that is easy for a newbie to …
Troubleshooting Solution

Implement VSS on 6509 Switches

Hello Experts,

I've a pair of Cisco Cat 6509E Switches ( Core 1 and 2)  populated with line cards (…
Troubleshooting Solution

Can tangled trees be used to represent router's hops?

In the following example available from D3 library they use tangled tree to represent a parent node …
Troubleshooting Solution

Existing Win10 Clients Finding Old DHCP Server

I just migrated to a new DHCP server last night. I've confirmed that the DHCP server is activated …
Troubleshooting Solution

How does ping -a resolve host names?

I'm having an issues where if I do a ping -a <ip address> its giving me the wrong DNS name.

For …

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