Author Archives: Robert
Cisco TCL – ping script.
In an earlier blog I wrote about a tiny hello world script. Now I want to raise the bar a little bit, by creating a ping script. After a quick search on the internet I found a several kinds of … Continue reading
Cisco TCL – first steps… Hello world
For some time Cisco offers TCL shell on their equipment. This is awesome, because sometimes you need a single command to retrieve information whereas IOS demands you to enter one or more commands. But before we get lots in possibilities … Continue reading
Anki – Spaced Repetition
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
First Hop Redundancy Protocol – HSRP
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
Access-list mask or wildcard
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
Juniper filters
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
Be micro-ambitious
Target setting Continue reading
Juniper SRX 110
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
Policy Based Routing
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
Error-Disable
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
Network Ninja 