Back with the Topology, because we are labbing this time! I have three more videos I want to compress into this one lesson as they are all pretty short and to the point, and then it is time to start the extremely large BGP section which I am really looking forward to labbing (absolutely new … Continue reading Security Triple-Header to finish the Security Section: Filtering “debug ip packet”, spotting memory issues, creating and understanding core dumps!
This will be a quicky I hope, pretty straight forward topic, but I always say that so lets get started. The IP helper-address is a command issued at the interface level, on the interface of incoming broadcasts, and its purpose is to forward UDP broadcasts on (as routers DO NOT forward broadcasts) to other routers … Continue reading Ip helper-address command explanation and configuration, and some important details and one additional helper cmd!
Not to be confused with RPF (Reverse Path Forwarding) which is a multicast feature, Unicast RPF is a Unicast feature, which allows a router to verify an incoming packets source IP address by ensuring it is reachable. To do this, it uses the FIB (Forwarding Information Base) to perform this check. To accomplish this "ip … Continue reading Unicast Reverse Path Forwarding (RPF) discussion, configuration, and a LOT of great commands and output examples!
So to begin this, I apparently completely spaced writing R1 so nothing got saved, and we are back in time again: R1#sh clock *22:38:45.666 UTC Fri Mar 1 2002 R1# So I've decided to go right into Authentication first, as it's fairly straight forward with an odd behavior to note, then continue my battle with … Continue reading NTP Authentication and ACL configuration, odd behaviors explained, and issues to troubleshoot as always!
For this lab I will be using this OSPF Topology, which has the virtual-link to R4 to bring it into the entirety of the network, and to demonstrate how to configure each of these routers so they keep in sync with the entire network via NTP even if their primary time source goes down. So … Continue reading NTP – Network Time Protocol discussion, configuration, and some NTP / routing troubleshooting as usual!
I will keep this brief and right to the points of SNMP, as it is St. Patricks Day night, and I really don't have any other better plans... I'm just tired from work and its about nap time. That being said, SNMP is a "polling" protocol used to carry network information traffic on UDP port … Continue reading SNMP (Simple Network Management Protocol) Fundamentals, very important configuration notes for exam day!
I have the above network configured, but again will just use R1 and R5 for the discussion and examples of router output and configuration, as I am a walking zombie today due to lack of sleep and life stuff. Speaking of life stuff, I said I was thinking about pushing my date out for CCNP … Continue reading Router password fundamentals, configuration, a very good brush up on passwords unless you just took the CCNA