Category: Uncategorized

ONT Notes – Classification, Marking, and NBAR

Here’s another set of notes from my ONT studies.  I’m sure someone will find it useful.  Please help to correct dumbass mistakes. Classification is done with traffic desriptors Ingress interface CoS value on ISL or 802.1P frames Source/destination IP address…

ONT Notes – Intro to QoS

I’ll try to keep it a little shorter this time. Major issues for converged enterprise networks Available bandwidth: competition among applications Fixes Increase bandwidth: More power! Properly queue based on classification and marking: QoS Compress: cRTP, TCP header compression, etc.…

ONT Notes – VOIP Networks

Here are some of the notes I’ve been taking while reading over the ONT book. I hope it benefits somebody.  Feel free to correct any stupid mistakes as a paraphrase to avoid a lawsuit. There’s way too much info here. …

Here’s To Another Year

Here we are at the end of another year.  It’s been a pretty good one for me – the wife got a new job, we have a new house, we’re in good health.  I hope that you, too, have had…

ISCW Down, Three To Go

I took and passed the ISCW test today.  I was super-nervous going into it, which is weird for me, but I finally calmed down after the first few questions.  Here’s my take.  I don’t want to get into any trouble…

Convenience versus Security

I coworker sent over a link today that got me thinking about an old adage that I’ve been sharing for years.  The link actually has nothing to do with the philosophy but did trigger a random spewing of words from…

ISCW Notes – Access List Resequencing

I don’t know if this really pertains to the ISCW test per se, but this is something I learned in my class last week.  I’m sure I should have learned this years ago, but, alas, I didn’t. Access lists get…

ISCW Notes – Role-based Views

I’m at training for the ISCW test this week, and this topic came up yesterday.  Since it came up last week at the office, I figure it was a sign from $deity that it was time for a blog entry.…

I’ve Been Hacked

It looks like one of those Russian b*%*#rds got me some time last week.  I don’t know how long the site was down for sure, but I would guess that he first got access on Thursday, 22 October.  Since we’re…

Using SPF Records To Build Objects

My biggest complain about modern firewalls is their lack of the ability to create rules based on URLs or HTTP streams; you have to open access between IP addresses.  Yes, I know there are other means to do that, but…