NTP Broadcast better demonstrated over an Ethernet segment, pretty brief and to the point to finish off the NTP section!

I have done a "wr er" / "reload" on R1 and R5, configuring only loopbacks, and opened Fa0/1 interfaces to be Area 0 between the two. No NBMA, no oddities (hopefully), and see how it works with a lot of troubleshooting. So to begin, I'll set R1 first as the NTP master with a clock … Continue reading NTP Broadcast better demonstrated over an Ethernet segment, pretty brief and to the point to finish off the NTP section!

NTP Finale – Configuring broadcast / multicast / version #, and disabling NTP all together – Time to see what breaks!

After quite a few days out of the study game due to illness and actually giving myself time to recover from it this time, I am back, and I am already sick of going over NTP - So this is the last but important concepts for NTP. One oddity I have noticed working with NTP … Continue reading NTP Finale – Configuring broadcast / multicast / version #, and disabling NTP all together – Time to see what breaks!

NTP Authentication and ACL configuration, odd behaviors explained, and issues to troubleshoot as always!

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!

NTP – Network Time Protocol discussion, configuration, and some NTP / routing troubleshooting as usual!

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!

SNMP (Simple Network Management Protocol) Fundamentals, very important configuration notes for exam day!

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!

Router password fundamentals, configuration, a very good brush up on passwords unless you just took the CCNA

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

Time based ACL’s, configuring time-range and differences in types of ranges, using time-based ACL’s to limit telnet access

I'm was going to wait for the NTP part of the course to go through this, but since it looks like ACL material finishes with this I will use the time-range command for now rather than synchronizing the network to an NTP server. A bit of a refresher from CCNA material, but it can't help … Continue reading Time based ACL’s, configuring time-range and differences in types of ranges, using time-based ACL’s to limit telnet access

Access-List Refresher: Standard, Extended, and Named ACL’s – Very good refresher material, some of this material like best practices I had even forgotten

I was going to just use two routers for this example, after work when I was tired and rushing, so I stopped and decided to be thorough I didn't want to work with loopbacks. So please forget the Stub things in the topology, those area's are not stubs, however the OSPF information is correct. Also … Continue reading Access-List Refresher: Standard, Extended, and Named ACL’s – Very good refresher material, some of this material like best practices I had even forgotten

IPv6 migration strategies from IPv4 networks, need to know details for exam day explained!

This will be a quick post with NO Topology added this time, so tomorrow I can hopefully jump right into the security section of route starting with ACL's! So I will list off the terminology for methods, the up and downs of using them, and how they stack up against other methods. One important thing … Continue reading IPv6 migration strategies from IPv4 networks, need to know details for exam day explained!

RIP for IPv6 (RIPng) configurations, explanations, and plenty of examples!

I will be recycling the last labs Topology for this and one final OSPFv3 headache, and then IPv6 is done for now (though I am sure I will recover the topics at some point). So as can be seen kind of above, it's a weird sort of RIP boundary to not block the IPv6 addresses … Continue reading RIP for IPv6 (RIPng) configurations, explanations, and plenty of examples!

Configuration of EIGRP in IPv6, output examples and differences from v4, and some old IOS code derps!

I sometimes wonder how much it makes network engineers cringe when they look at a blog post (if any engineers do), and see my barely put together Topology not made in Visio as my diagram 🙂 Anyways this should be pretty quick, so far I have only configured the loopback and FastEthernet0/0 interfaces for the … Continue reading Configuration of EIGRP in IPv6, output examples and differences from v4, and some old IOS code derps!

IPv6 Redistribution, Stub and Total Stub configuration, and some gotchas to watch for on exam day!

I was going to bring R1 in on this with a Point-to-Point Serial cable, to make the Topology look a little less pathetic than the usual all out routers everywhere model, however for these topics I only need these 3 - Though I may need to for further IPv6 studies. So far I've confirmed the … Continue reading IPv6 Redistribution, Stub and Total Stub configuration, and some gotchas to watch for on exam day!

Part 4: Found an IOS bug on R5, and found why IPv6 doesn’t work over my NBMA, so I won’t be able to lab it :(

I'm thinking it has to be something on that frame switch so we'll dig into the guts of that, but I start off with R5 (not in this Topology in which you will see why), just to get SOMETHING going for R1. As you may not know from previous labs, R5 is attached to R1 … Continue reading Part 4: Found an IOS bug on R5, and found why IPv6 doesn’t work over my NBMA, so I won’t be able to lab it 😦

Part 3: Fixing the “ATTEMPT/DROTHER” issue, but still failing at the end

So through begging all over on Cisco support community and other tech forums, someone had pointed out that my running config appears to be missing the frame map statements, and I just facepalmed so hard I might have just smacked myself. Once more, if you use templates that setup "base configs" like ip addressing and … Continue reading Part 3: Fixing the “ATTEMPT/DROTHER” issue, but still failing at the end

Part 2: IPv6 / OSPFv3 configuration on Hub in NBMA, Hub stuck with neighbors in “ATTEMPT/DROTHER” state

So now we have R1 left to add to our OSPFv3 Circus, so lets get to work configuring. A couple thing to mention, that OSPFv3 still needs neighbor statements, but I don't quite remember where its config'd or what the syntax is so lets gets started: R1#conf t Enter configuration commands, one per line.  End … Continue reading Part 2: IPv6 / OSPFv3 configuration on Hub in NBMA, Hub stuck with neighbors in “ATTEMPT/DROTHER” state