# Little Manual Subnet Calculation Learning Tool

Here’s how it works:

This little chart applies to any subnet mask, simply take the meaningful octet (the octet that is not 255 or 0) and apply what you need to know, such as:

A host has an IP address of 192.168.111.42/27 (/27 being CIDR notation – used literally in the syntax of Cisco NX-OS CLI & universally important to know, see here for more info).

We know that it has a sub-net mask of 27 1’s, shown in binary as:

11111111.11111111.11111111.11100000

(11111111=128+64+32+16+8+4+2+1=255), so (11100000=128+64+32=224) or, .224… and specifically 255.255.255.224.

So from a manually calculated CIDR notation of /27 we have a sub-net mask of 255.255.255.224. If you are studying to be a network engineer one should just strait up memorize each slash notations /1 – /32 corresponding sub-net mask, but don’t forget where it came from.

So, we have our meaningful octet from our sub-net mask, .224, and from that we can gather from the chart that the mask dictates that the class C sub-net is to be broken down into 8 separate blocks who’s network addresses span 32 IPs. **Remember this does not mean that you have 32 IPs available for hosts to use, the 32nd IP address is the second subnet’s network address, the 64th IP address is the third, and so on. The last IP address in a block is always reserved for that sub-nets broadcast address, and you loose one to the next block’s network address.  So that’s useful, but how are the numbers tied together?

Well, the top line is just powers of 2 starting with 2. Easy enough
The second line shows the value of the broken down binary octet (8 bits per octet with a 1(power on) meaning network bit and a 0(power off) being a host bit.  All 1’s or 0’s are consecutive in sub-net masks, you will never see a 10110101 or anything like it.)
If you had a mask of .224 like above, you have 11100000 (128+64+32) as shown in the chart. The CIDR notation /27 already has 24 single 1’s behind the 3 in the meaningful octet, so you just take 24 & add 3 instead of counting all 27.

The third line shows the actual sub-net mask. It is calculated from adding the block sizes of all columns leading up to the meaningful octet of the sub-net mask.
In the .224 example, this was calculated by adding 128+64+32=224.

So, to write this chart out you don’t need to memorize it. Just know:

1. Powers of 2 starting from 2. (3rd grade math)
2. Binary values of 8 bit numbers used in IP.4 addressing. (Should know this long before you     get to sub-net calculations.)

I made up this little charge about 4 years ago in preparation for the first Cisco exam I ever took. While it’s very useful to jot down before a test begins on your scratch paper, if you use it in conjunction with your multiples of 16, 32, 64(most common sub-net sizes that require thinking) charts enough during study like I did, you’ll find that you don’t even need the scratch pad.

Memorizing this little chart & being able to recite your multiples tables (see below) is all one needs to do IPv.4 subnet calculations in your head.

### 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256

More fishing adventures with Skylar and Dave! First time catching a blue cat in arcadia – ever – and two in one night. Big one was 18lbs, he looks hungry!

# There is something very, very big in lake Arcadia

So Skylar and I were fishing thursday evening in the south eastern corner of the lake near the “catfish goldmine” area, just to the left of it on the map (scroll down a few posts).  the lake was nice and calm & very little to no wind so we upped anchor and free floated for a while with a few heavy rig cat poles dangling down about 10 ft.

About 9:30 we were thinking about packing it in when Skylar said ‘hey we’re moving.’ Indeed the boat had turned around and was now facing south, and slowly moving in that direction. “Check the lines” one of us quickly said. I checked my three, slack, Skylar’s big cat pole was tight and angled out into the water the direction of our movement.

OOOooo we got excited.
Sky grabbed his pole and gave a good hook set jerk and pulled hard. The pole appeared to be snagged on a rock, and wasn’t doing the tell tale jerk bobbing of FISH ON! movement. With the boat free floating we figured we could probably get it loose if we just pulled the boat over to where it was hooked. Sky gave a good slow tug to start moving the boat… and something tugged back… HARD. “Man this thing is alive!” Skylar immediately reported out loud. Sky continued to play pull and give for the next 15 minutes until the boat and creature were stacked on top of each other.  At this point the thing was, we assumed, on the bottom of the lake about 15 feet down RIGHT under the boat. Sky’s putting a pretty good upward pull on his pole, it’s bent in half at a 90 degree angle strait down into the water. When the thing relaxed Sky was able to lift it about a foot strait up before it dove back down again, and when it tried to dive I am absolutely dead serious this thing DOVE! The thing had still not shown any signs of fish bobbing, thrashing around or horizontal movement whatsoever. This is about the time we realized that what we were dealing with was no fish, that it something far more massive. When it dove the pole did something we’d never seen before. The tip of the pole vibrated back and forth about 4 inches rapidly… very strange. It did that every time the thing made a mad dash for the bottom of the lake. There was nothing we could do to stop it’s decent once it decided that it wanted to go back to the bottom. Skylar was putting every bit of fishing know how and arm strength into this thing, pulling as it let him, quickly reducing drag to keep from snapping the line when it pulled. This dance went on for another 10 minutes, there was a brief moment when it seemed like the thing decided it was going to swim upwards and Sky was able to quickly reel in about 5-6 feet of slack before it tried to dive again. By this time we’d pulled in roughly 20 feet of line and we were beginning to wonder how close it was getting.

Right about this time Skylar got a good glimpse of the thing…  With me about 5 feet away from where the line met the water – clutching the giant fish net with white knuckles – , and Skylar & his headlight pointing strait down into the water about 3 feet from the surface, Sky reported “I SEE IT!” A big white underbelly of something rolling over in the water just a mere 1-1.5 feet below the surface, not 2 feet off the side of my little boat. Right about that time this thing decided that it didn’t want to be on the hook anymore and dove HARD, right under the boat at a sharp angle – the first time it actually made any violent motion the entire length of the fight – pulling Skylar’s fishing rod nearly backwards on itself, into the water, under the boat, and tore the hook loose….. The feeling I got when that hook came FLYING into the air to expose the fact that sky only had about 4 feet of line from hook to pole was one of absolute horror. It was akin to the feeling one would get if one were to see their wife get hit by a speeding car, or the feeling you get when you realize the plane you’re in is going to crash.

For a brief moment Skylar and I stared at each other dealing with the shock and horror of loosing whatever creature it was.  Time stopped, thoughts froze and nothing else existed in the universe other than the fact that we had just lost the biggest creature that we had ever seen hooked in our lives.

So.. 30 pound test line, spit tightened polomar knot, 6” plastic coated steel leader, nice fat catfish hook & a 5-6” long dead shad resting 15 feet down on the bottom of that cove. 25 minute fight, no side to side movement, the feel of HUGE 150-200lbs of mass, very powerful creature, very strange vibration during movement, and a white underbelly.. there’s only three things I can think of that could fit that description:

100lbs+ lazy flathead catfish – but it really didn’t feel or act like a fish on a line…

Full grown adult male alligator snapping turtle the size of a semi truck tire – but they dont have white underbellies like what we saw…. or…..

an alligator, which as unlikely as it seems, fits every bit of the event’s happenings..

stay tuned for future updates. we will be assisting game wardens this evening spotlighting for this thing as we fish.. with really, really big ..catfish tackle.

# Excerpts from Skylars log:

1. Skylar says:

Excepts from my (Skylar) fishing journal:
2356hrs August 17, 2011

2130hrs August 17, 2011
…Just for the record, I was using a heavy pole with a heavy rig on it. The bait was fresh, dead shad. I had cast out about 20 feet to the south, which was the direction we were slowly drifting. During the time the line was out I had been taking up the slack and probably was still somewhere between 10 to 15 feet out from the boat and sitting on the lake bottom. Dave says that area is somewhere around 15 feet deep and I have no reason to doubt him…

….I felt the boat spinning around and then got the sensation of forward motion. Dave and I began checking poles. The instant I looked at my heavy catfish pole I knew something was up…

…At first reeling in the line wasn’t that difficult and even though the boat was moving I could feel whatever I was hooked on moving toward the boat as well. The boat was almost on top of it and at this point I was still thinking it was a tree branch or something when it made a diving run back under the boat to the north. It was strong and I wasn’t ready for it. The pole pulled out of my right hand (the hand of the crank) and almost out of my left hand on the handle. The tip of my pole bent around to more than a 90-degrees angle and disappeared into the water. I believe it was at this point when I started yelling at Dave, “It something alive!” While I was yelling I shoved the end of the pole between my legs and sit on it while leaning back and pulling with both hands. At this point I was pretty sure my pole was going to break, but it didn’t. I managed to pull it out from under the boat and some of the pressure on the line let up.

By this time Dave had hauled in a catfish of his own and moved forward so that he could now see what was going on… (See Dave’s report)

…From this point on there were no more sideways runs. It was swimming straight down. I would get it coming up when it would start pulling almost straight down. There were several times I got worried my line or pole was going to break and backed off the drag to let it run. It would go straight down and just sit. Ever time I would get it get close to the boat I’d start feeling this throbbing in the pole that would get quicker and quicker. I quickly learned what was coming next and would get ready for the next dive…

…Now my forearms were really starting to ache. I had no idea how long this tug-a-war had been going on, but I was getting worried that I wasn’t being aggressive enough. So this time when the pole started its tell-tell throbbing I decided not to loosen the drag. Instead I moved the end of the pole out from under me and hooked it under the edge of my belt. When the dive came I pulled back hard listening for any signs of my pole breaking. At this point my pole started vibrating violently. I yelled at Dave, “Can you see this!”…

…I got about three turns on the crank when I saw something huge and off white about 2 to 3 feet down in the water and about a foot to the side of where my line disappeared into the water. It was definitely rolling counter clockwise. Then it dove again and I couldn’t keep it up. This time I managed to stop the dive about 5 feet down…

(Continued Next Comment)

2. Skylar says:

(Continued From Previous Comment)

Excepts from my (Skylar) fishing journal:
2356hrs August 17, 2011

2130hrs August 17, 2011

…I quickly reeled it up again and when it went to dive I pulled a few feet to the side. The effect was it hardly went down at all. I waited for the next dive and did the same. I was inching it up…

…This went on about 4 more times. Then it happened. I felt the throbbing, pulled to the side and leaned back when all of a sudden my hook and about 3 foot of line came shooting up in air between Dave and me. I toppled back into seat behind me…

0945hrs August 18, 2011

Called Chance Lively, a Lake Arcadia Game Warden, and told him my story. After listening to my description of events he told several things. One was that it sounded very much like an alligator. They are going to begin searching the lake for gator signs today. Although he wouldn’t say it was one for sure, Dave’s and my reports were similar to what others had reported with gators elsewhere. Another was he ruled out turtles. His conclusion was a very large flathead catfish or an alligator, but “catfish generally don’t swim straight down.”

2323hrs August 18, 2011

Dave tells me that there was about 4 feet of fishing line from the tip of my pole to the hook when it pulled through.

Final update (dave here) – the game wardens searched for drag marks on the shore line around the area and spotlighted for a few nights. about a week after the event skylar and i were out fishing near the area again. we had observed a boat spot lighting for some time up in the cove but didnt think much of it.  later on we heard 2 or 3 small arms fire gunshots from that direction, sounded like a 22WMR. We can’t be for sure because the wardens are pretty closed lips about it, understandably if word got out to local media, but sky & i have pretty high suspicions that our “lake monster” has been dealt with.  Regardless, we still fish that cove with one massive 80 pound line pole & a deep sea gaff hook with the hopes that the creature will one day return.

So I was fishing by myself out at Arcadia a few months ago and I was really, really bored. I made up a little song to pay tribute to the bait fish I use when cat fishing.

I’ve had a few people tell me to sing it on youtube, maybe I’ll do that sometime, but in the meantime here’s the lyrics.

not his fault that he smells so bad,
goes on a hook so we can eat,
those cat fishies have such tasty meat.

swimmin through the water with out a care,
until my net flew through the air.

~sung with a heavy Jamaican rasta-mon accent with steel drums playing the tune.

# More big fish

So aparently fishing with a boat is good stuff. This weekend Seth and I drove about 25 miles up the Kerr-Megee (sp?) barge channel in Tulsa in search of that mythical monster catch of a lifetime catfish. Around 4 AM I pulled in this guy on dead stinky shad resting on the bottom. My net wasn’t big enough so I had to beach em to get em out. Had to tie him to the side of the boat to get him back as well, couldn’t fit em in the live well even curled in a circle.

The next fish I set hook on broke the line on the same pole that I caught this one on – must be a lot of these big boys in that river.

Unconfirmed weight 40-45 lbs. I need a bigger (an functional) fishing scale.

# Big Channel Cat

Pulled this guy in yesterday, was very happy I remembered to bring the net.

Caught on live shad on a curved barb circle hook. It put up a pretty good fight, swam under the boat and spun the boat around the anchor. Had to be real gentle with it, the rod/line/reel were all pretty old and brittle. 10 pound line too. Next time I bait a shad that big (was around 6″) I’ll put it on one of my good 30 pound line cat poles.

Caught in arcadia in 5 feet of water. The scale said 11 pounds but i think its lyin, brand new scale n all. Felt more like 25-30.

Pulled this one in just before the big one too.

So after a few exploratory trips to lake Arcadia, here are my observations.

# National guard called in for fire

Big Fire covering over a square mile in north edmond yesterday. I was at the lake packing up the boat when a HUGE dual blade Helicopter flew in and scooped up a big upside down parachute type of water holder. This copter was big… Bigger than normal dual bladed copters, looked like it was about four times the width of a city bus and twice as long. Windows on it indicated that there were two floors on it, easily two stories tall in hieght.

Pics and video!

Part 1

Part2

click for full size

# Tracker Pro Angler 16

Bought a 16ft bass boat, Mercury 4 stroke(so quiet!) 30hp power tilt & electronic fuel injection, seats 3 while moving, 9 gallon live well, fish finder, trolling motor, couple good storage compartments, 4 slot rod holder, 6 gallon gas tank(after 10+hrs on the lake already it’s not even half empty, very fuel efficient!) & trailer.  Pictured in the store is the actual boat I received, got the display model, last 2011 model to be sold out of the Oklahoma City bass pro.

Already added florescent light, power inverter, power kill switch for power inverter & fish finder, silly attempt at using a beach umbrella as a sun shield, too high to work well. I need to find some rod holders that work. The cheapy 3 dollar clamp-on’s from academy are garbage and wont even hold themselves to the boat.

After some testing it looks like the motor has 2” of clearance when the depth meter on the fish finder reads 1.5 feet.  Pull the motor up and navigate around with the trolling motor and this boat can work its way into the deep tree clusters of arcadia. Can’t wait to try it out at keystone.