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Twenty years later
10:30am Jun 28Events
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- Pilot online session: Routing ...
Internet (WebEx)
Wednesday, December 3 at 5:00pm
Red Pineapple was kind enough to share his 15-year-old ATM slides...
Last week I happened to be copied on an e-mail which included a PDF describing a “SP Services and Solutions” bootcamp I knew nothing about...
Based on the ADSL reference model we’ve discussed last week, let’s try to figure out how you can influence the quality of service over your ADSL link (for example, you’d like to prioritize VoIP packets over web download)...
Shahid wrote me an e-mail asking about local command authorization...
I’m looking for a touch screen device that would work (well) with PowerPoint. I’d like to start drawing my diagrams with a pen, not with a mouse; I have a completely unfounded irrational belief that drawing with a pen might be faster and easier than using a mouse. Any (tested) ideas?
Ivan Pepelnjak Four pretty serious potentially exploitable Facebook privacy issues
Source: theharmonyguy.com
For the record, Facebook has some of the most flexible and robust privacy controls I’ve seen in any online social networking service. I never want to take for granted that Facebook engineers have ...
The Cisco Subnet RSS feed I’m receiving from Network World contained interesting information a few days ago: Cisco has reissued the HTTP security advisory from 2005...
Ivan Pepelnjak Interesting argument: you lose if you act on misbehavior of your customers, you lose if you don't.
Source: www.cisco.com
There is a long-standing role in the communications industry where a provider of public carriage services undertakes the role of a common carrier. What's so special about the role of a common carrier, ...
We all know that the global BGP table is exploding (see the Active BGP entries graph) and that it will eventually reach a point where the router manufacturers will not be able to cope with it via constant memory/ASIC upgrades (Note: a layer-3 switch is just a fancy marketing name for a router)...
A reader who prefers to remain anonymous has reported an interesting observation: autocommands configured on local usernames do not work after configuring aaa new-model.This article is part of You've asked for it series. Read more in Cisco IOS Hints and Tricks blog
A while ago I’ve received an interesting question from someone studying for the CCNP certification: “I know it’s not necessary to configure clns routing if I’m running IS-IS for IP only, but isn’t IS-IS running over CLNS?”I’ve always “known” that IS-IS uses a separate layer-3...
I’m getting lots of ADSL QoS questions lately, so it’s obviously time to cover this topic...
It was (around) 1995, everyone was talking about ATM, but very few people knew what they were talking about...
Ivan Pepelnjak Brad Reese stumbled on a gold nugget. Excellent text by George Morton.
Source: www.networkworld.com
18Mbps down and 2Mbps up service for 15% of the cost of T1 service, 36Mbps down and 4Mbps up service for 33% of the cost of T1 service
Ivan Pepelnjak I like the quote at the end of the article: "My competitors are welcome to them. They won't earn anything on them either."
Source: www.telegeography.com
Dutch telecoms operator KPN says it will stop offering free mobile handsets to customers taking out a pay-as-you-go package
The “GRE keepalives or EIGRP hellos” discussion has triggered another interesting question:Is there a good rule-of-thumb for setting hold-down timers in respect to the bandwidth/delay of a given link...
Ivan Pepelnjak Paul McNarama could easily use the same approach on NetworkWorld articles ;)
Source: www.networkworld.com
... or, 'How headline writers create news.'
Ivan Pepelnjak Great interview with Randy Bush. Very interesting thoughts about costs experienced when hitting the IPv4 wall (starting @ 02:30).
It looks like everyone who’s not using DMVPN is running IPSec over GRE these days, resulting in interesting questions like »should IP use EIGRP hellos or GRE keepalives to detect path loss?«Any dedicated link/path loss detection protocol should be preferred over tweaking routing protocol timers...
I had an interesting debate with an engineer who wanted to use TFTP between a router and a server reachable through an outside interface...
Ivan Pepelnjak Involved in project or team management?
Source: www.alistapart.com
If I move a muscle, I’m dead. Jane, who I’m pretty sure is a Werewolf, is jumping from one player to the next, testing will and looking for weakness. She’s looking for a sign of guilt or discomfort and it’s not just her. ...
A few days ago, City College of New York hosted the “Cyber Infrastructure Protection Conference”, including a keynote speech by Krishnan Sabnani who described “new class of denial-of-service (DOS) attacks that threaten wireless data networks” … or so the Network World claims in its...
Ivan Pepelnjak Don't guess. Test. Works every time (even in web design).
Source: www.useit.com
Even the tiniest amount of empirical facts (say, observing 2 users) vastly improves the probability of making correct UI design decisions.
I've got the following question from Matthew: »how would one go about matching the default route for filtering using standard ACLs?«In all routing protocols but EIGRP (which can carry the »default candidate« flag on any IP prefix), the default route has IP address 0.0.0.0 and subnet mask...
Ivan Pepelnjak T-mobile hit by hackers?
Source: www.networkworld.com
T-mobile customers are awakening this morning to reports that hacker/extortionists have victimized the cellular carrier through a massive network breach resulting in the theft of untold amounts of corporate and customer data, which they're threatening to sell to the highest bidder.
Everyone studying the EIGRP details knows the “famous” composite metric formula, but the recommendation to keep the K values intact (or at least leaving K2 and K5 at zero) or the inability of EIGRP to adapt to changing load conditions is rarely understood.IGRP, the EIGRP’s predecessor, had...
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Ivan Pepelnjak commented on their own note Filter excessively prepended BGP paths.
Ivan Pepelnjak