Author Archives: Robert

SSH error on cisco router

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

Posted in CCNP

DHCP Helper address

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

Posted in CCNP, GNS3 | Tagged , , , | 1 Comment

GNS3 caveat – port status

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

Posted in Commands, GNS3 | Tagged , , ,

Extended IP Access-list

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

Posted in CCNP, Commands | Tagged , , , ,

EIGRP neighbors

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

Posted in Commands

Cisco Express Forwarding

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

Posted in CCNP, Commands | Tagged ,

Virtual Lab setup

Today I want to talk about the lab setup I have made. But first a slight warning; I will not discuss any use of illegal software nor will I tell you how to get IOS/IOU files. For quite some years … Continue reading

Posted in GNS3 | Tagged , , ,

CCNP Books have arrived

The 300-115 (switch)  book was already in my possession.  This week the last two books arrived; 300-101 (route)  and 300-135 (tshoot). For some time I was cramming labs from whichever tutorial I could lay my hands on. Now the study … Continue reading

Posted in CCNP | Tagged , , ,

T-Mobile – Evernote course

Last week I received an email with en invite to attend a free Evernote course. Free is good and Evernote is great tool to store and organize brainfarts. Immediately I jumped to the occasion to enroll to the course. I … Continue reading

Posted in Lifehacking | Tagged ,