Distribute-list Fun!

Last night i was doing some Vol.2 Narbik Labs. I was supposed to filter some OSPF routes entering the routing table on a certain router. I chose to use an extended access-list because, well, just because i could. The command i wanted to use, was the router-config mode command “distribute-list”.
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Closing out on 2009

Short update before the end of the year. This year has been the worst one for me yet. Mainly because of health reasons. It has also been the year ive accomplished the most in my personal life, obtaining CCNP in the spring, and passing the CCIE written in the autumn.
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Remembering…

The link below is an excellent read from INE that you should really take the time to read. I am working on a post about the OSPF forwarding address, as well as some MPLS stuff. Stay tuned 🙂 I just wanted to get the link out there.
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Lab V4 at first glance.

The new CCIE lab version is in effect. Called version 4. The first guy on OSL (Online Study List) has been through it, and there’s certainly some changes. First up, is the annoying OEQ (Open Ended Questions), these were on the retired version 3 as well.
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uRPF behavior

I want to show the behavior of the uRPF feature. Unicast Reverse Path Forwarding. Basically this is a security feature, to prevent spoofed source IP address (very basic). Its function is to prevent a router from processing a packet comming from an unknown source/wrong interface.
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Landed a new job.

I have just landed a new job. It is a networking company, doing alot of security, ip telephony and general network consulting. The company can be found here. It is called NetIP. The company is located about 30km from where I live, so a little drive in each direction is nessecary.
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L2protocol-tunnel

So a simple concept right? Tunnel your L2 protocols through a switched network? I agree, but as usual, i put more complication into it. Basically a VOD from IPexpert on L2protoco-tunnel used to create a trunk connection. In the video it is shown that you can create a trunk by using a l2protocol-tunnel (STP in particular).
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Study and flashcards.

I have mentioned it before, and i’ll do it again. Flash cards are great for remembering those pesky little details. I wanted to share the flashcards I have created so far: http://flashcarddb.com/cardset/24460-cisco-flashcards Hopefully you can get some use out of them.
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Basecamp reached.

Lately I havent been keeping up my chores on the blog. Theres a good reason for this. I have really been studying hard to do the written exam again. Done lots of practice tests, a lot of technology focused labs on especially some edge areas where I wasnt 100% sure of things.
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Advertising on wordpress.com?

Sorry for the lack of updates lately. I have been very busy with real-life things as well as reading a bunch of stuff. Does anyone know if it is legal to advertise on wordpress.com? I cant find any guidelines regarding this in the terms-of-service.
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Security topics.

Right now Im working on security topics! This is by FAR my weakest area according to all the tests. I am approaching this from the ground up. Reading exam certification guide. Taking notes. Try it out on the lab. All the things i get wrong, i read whitepapers/documentation on.
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Interactive enhancements to vendor material

If you are into the world of CCIE stuff, you know that both the written and the lab exams will change very shortly. Alot of emphasis will be put onto the task of troubleshooting networks. From the onset this seems like a tricky part to teach anyone, and it is.
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The battle for bandwidth.

So I saw a post over at Ioshints about bandwidth, how we, as consumers come to expect a certain bandwidth, and how ISP’s are dealing with these issues. It is a fact that ISP’s greatly oversubscribe their networks, and keep selling more access-lines with an even greater bandwidth cap than ever before.
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OSPF and some interesting facts.

Even though my next post was going to be about some enhancements to STP, I found this little nugget about OSPF behavior, that I thought I would share with everyone. As we know OSPF, when crossing an area boundary, the ABR (Area Border Router), will gather type 1 (router and its links) and type 2 (network information provided by the DR on a transit network) and form a type 3 LSA, which is basically a boiled down version of the two other types of LSA’s.
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Back on the horse…

I failed my first attempt at the CCIE written exam this thursday… It really sucks. I was very close to passing it, but unfortunally it didnt happen. I need alot more practice questions to get a “feel” of whats being asked.
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Weekend roundup.

So I have started my review process. I have some things on my list that I need an in-depth look into. Among these are: IPv6 tunneling types. Web Cache Communication Protocol (WCCP). Some Frame-Relay workings, like FRF.12 and FRF.9. Switching section in BCMSN, particularly MST.
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Google Wave

I am just watching the video of the google wave application. It is really impressive what you can do with the modern web technologies. One thing that really shines through is the real-time updating. This is a really cool technology that I can envision a bright future.
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ACL and Wildcard masks

Been spending the last few days doing some leg-work on understanding different ACL’s to match different networks most effeciently. Alot of posting on Online-Study List on how to do this, all very valuable. Tyson Scott from IPexpert created a PDF file that was posted, and will also be made available from IPexpert.
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