Author Archives: Robert

Anki – Spaced Repetition

Posted on 24 December 2017 by Robert

While studying, I am seeking for ways to study more efficient. In the beginning I stumbled upon a method called ‘spaced repetition’. This method is wildly popular in the U.S. Unfortunately when I attended high school my home country this … Continue reading →

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First Hop Redundancy Protocol – HSRP

Posted on 22 December 2017 by Robert

Cisco proprietary HSRP protocol is a protocol for enabling a first hop fault tolerant router. Enabling your default gateway ip address to ‘live’ on more than one router. Back in the old days you had one router to exit a … Continue reading →

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Access-list mask or wildcard

Posted on 6 November 2017 by Robert

G’day all, today I was messing around with access-list.  And after getting my head around the weird subnets of rfc1918. Weird as in an A-class (/8) is reserved in A-space, B-class (/16) in reserved in C-space, and for the B-space … Continue reading →

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Juniper filters

Posted on 20 October 2017 by Robert

In the networking world a multitude of vendors are present. And each of them have their magnificent features  but also their quirks. And one of the quirks, for the network vendors in general, is that terminology is not uniform. Where … Continue reading →

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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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