Network Engineering

Connecting to Cloud Providers High-Level Network Architecture

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More than 70 percent of Internet Traffic passes through Data Center Alley in Loudoun County. Ashburn, Virginia has the largest data center footprint in the world. It makes sense to lease or collocate your data center here. Almost all cloud providers (Azure, Amazon AWS, Google, Office 365, etc.) have presence in these data centers. Being collocated locally can take advantage of direct connect services to any of these Cloud providers. Ashburn Consulting can help you design a Hybrid Cloud On Prem ...

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VTC Video Conferencing Rules for Palo Alto Firewall

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If you have a Cisco Telepresence VCS Expressway or a legacy Tandberg Border Controller or even an MCU behind a Palo Alto Firewall there are several Application based objects needed to be in your Outbound and Inbound Security policy.

  • rtp-base
  • rtcp
  • h.225
  • h.245
  • h.323
  • sip
  • rtp

Normally the logs will show which ports are being denied by the clean up rule. Depending on the type of Firewall, you might need to create an object with a certain udp range. There are also cases where a VTC endpoint is ...

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Cisco TMS Telepresence Management Suite Upgrade & Install from 13.0 to 14.6

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If you have an old version of TMS (13.0) running on an unsupported Windows Server 2003, here is a very extensive procedure to upgrade it to TMS version 13.2, do Database recovery, restore and conversion, and migration to a new Windows 2012 R2 system running on SQL Server Express 2012. The final step was to upgrade to the TMS version 14.6.

First big issue I ran into was the 2008 SQL Express server “SA” password provided by the previous SQL Administrator ...

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Next Generation Firewall Overview with Glimpse of Application Identification

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“I am not an advocate for frequent changes in laws and constitutions, but laws and institutions must go hand in hand with the progress of the human mind. As that becomes more developed, more enlightened, as new discoveries are made, new truths discovered and manners and opinions change, with the change of circumstances, institutions must advance also to keep pace with the times. We might as well require a man to wear still the coat which fitted him when a ...

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ICMP Security

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This is a draft guide to handling ICMP securely.

Guide Analysis to Handling ICMP protocol

Summary:

This guide is an attempt to help answer common questions related to the handling of ICMP protocol in a secure and effective manner. Comments and feedback is always welcomed. This article is meant to cover the major area in which there may be questions on how to handle ICMP and what specifically should we allow in each particular condition which will also allow for ...

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Layer 2 Tracing for (6500, 7609, 4500) Cisco Switches

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In a 6509, 7609 or any Chassis based Cisco switch, to determine where the switch forwards a Source and Destination pair to an actual port in a Port-channel/Etherchannel do the following commands:

Note: Doesn’t apply to Nexus switches.

First enter console for switch:

port-channel hash
Switch# remote login switch
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Great SMTP DNS and Troubleshooting tool

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mxtoolbox

Go to http://www.mxtoolbox.com

This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain’s authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP ...

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Cisco ISR Platform feature by Ashburn Consulting

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A video presentation about the Cisco ISR platform from Cisco’s Solutions Architect, Randy Benn. IPICS, Video Distribution and Management, POE switch modules, IP Camera termination are all integrated in one ISR platform. Interview conducted by Amante Bustamante.

 

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MPLS L3 VPN White Paper

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Enterprise Network Design White Paper
For Metropolitan and Campus Networks –
MPLS L3VPNs 
Robert Shields
Sr. Network Engineer, CCIE # 12096 
January 2012 
Enterprise Network Challenges of Today and Beyond 
Enterprise network and security managers continue to see their responsibilities increase within their respective IT organizations as applications and services continue to migrate to IP as a fundamental means of communication. These applications and services include telephony, video, wireless and mobility clients, storage area networks, etc., ...

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