Author Archives: Robert

Be micro-ambitious

Posted on 19 August 2017 by Robert

Target setting Continue reading →

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Juniper SRX 110

Posted on 10 July 2017 by Robert

This week I bought an Juniper SRX 110. This device will help me to get more acquainted with the Junos cli structure.  From a Cisco perspective this box is slightly wider than a Cisco 8xx series router. But maintaining 1U … Continue reading →

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Policy Based Routing

Posted on 1 July 2017 by Robert

Policy-Based routing is a neat trick to tweak traffic streams. For Policy Based Routing to work you will the following; – Define traffic stream in an access-list. – Write down a policy. – Determine the inbound interface. First use an … Continue reading →

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Error-Disable

Posted on 30 May 2017 by Robert

When a network port encounters an error. This port is automatically shutdown to ensure network stability. When error-disable is enabled. The predefined error are as follows; arp-inspection bpduguard channel-misconfig dhcp-rate-limit              gbic-invalid                 l2ptguard                   link-flap mac-limit link-monitor-failure loopback oam-remote-failure pagp-flap port-mode-failure psecure-violation … Continue reading →

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SSH error on cisco router

Posted on 14 March 2017 by Robert

Enabling SSH on a Cisco router is not enough to guarantee SSH is working. Enabling ssh version 2.0 on a routers is as straight forward as;. >ip ssh version 1-2 I surely recommend the use of version 2, because ssh … Continue reading →

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DHCP Helper address

Posted on 6 March 2017 by Robert

Which source ip address is used when relaying a dhcp-request ? Continue reading →

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GNS3 caveat – port status

Posted on 26 February 2017 by Robert

Creating a network lab in GNS3 is reliefs on budget. But there are some drawbacks. One of which is port status. I have noticed that using GNS3 in combination with iouyap results in some unexpected behavior. Once a topology is made … Continue reading →

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Extended IP Access-list

Posted on 19 February 2017 by Robert

As we all have learned in our pursuit to CCNA there are many different types of access-list. In reality most commonly used are ip access lists. Major difference between ip standaard access-list an ip extended access-list is the ability to … Continue reading →

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EIGRP neighbors

Posted on 5 February 2017 by Robert

Cisco EIGRP protocol allows different methods to form neighborship relations. Default method is form neighborship automatically via multicast (multicast address of 224.0.0.10 is used) After an adjacency is formed ‘hellos’ are  sent using IP protocol 88 (eigrp). This means that; … Continue reading →

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Cisco Express Forwarding

Posted on 7 January 2017 by Robert

Differences between IP CEF , fast forwaring and processor based forwarding. Continue reading →

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