Daniels Networking Blog – Page 44 – Networking articles by CCIE #37149/ CCDE #20160011

Generate traffic with traceroute

I found a very useful tool when practicing the INE labs. How to generate traffic with traceroute. I’ve used telnet lots of times to generate TCP traffic on different ports but what if we want to generate UDP traffic instead?

RMON – Remote MONitoring

RMON stands for Remote Monitoring. It is an extension to SNMP that lets us enable event notifications when certain thresholds are met. We can monitor the performance of interfaces or the CPU and everything that has an OID in the

Lock and key ACL

The lock and key ACL is one of those features you’re not sure how to use in production but it is viable for the CCIE lab. The lock and key ACL is a form of dynamic ACL which requires a

Transport preferred none

Have you ever mistyped a command and the router thinks you want to telnet another device? Sure you have and so have I. The most common solution is to turn off name lookups. no ip domain-lookup This will tell the

Filtering traffic with a route-map

This post describes how to filter packets with a route-map. I have never used a route-map for the sole purpose of filtering packets before. I ran into this while doing a vol2 lab and the task was to filter ICMP

Filtering traffic with VLAN access maps

While doing a vol2 lab I got stumped by one of the tasks in the lab. The task was to filter ICMP packets coming from the backbone destined to a network on the internal routers. The topology looks like this.

Drastically decreasing CPU load in Dynamips

Running Dynamips takes a lot of CPU and memory and running a full CCIE topology on a Windows machine can be tough. I do a lot of studying on my commute to my job and I run some smaller labs

IPv6 over frame relay

This post will look at IPv6 over frame-relay and describe some of the small things that differ compared to IPv4 and some gotchas. We start out with the same topology as in my previous frame-relay post. We configure routers R1,

First troubleshooting session done

I did my first troubleshooting session tonight. I was worried about only having 2 hours alotted but time was the least of my concerns. I finished at 70 minutes so almost an hour to spare. I did quite OK, 60%