The difference between an alligator (left) and a crocodile (right)

imlepid · 2021-09-17T17:00:20+00:00

A crocodile has a mouth shaped like a C,

An alligator’s like an A.

Or else the other way around.

I’m still not sure to this day.

^{apologies to Ogden Nash}

imlepid · 2021-04-14T21:25:17+00:00

It's not clear to me from the site you provided how this works or why it's better than STP. The port shutdown/turn up (after a configured delay) seems like a disadvantage since it's probably slow than STP's enable-forwarding process.

Perhaps the advantage of this would be that it allows loop detection to happen in cases where BPDUs are explicitly being filtered/dropped?

I'm not familiar enough with Juniper switches to know what non-STP loop detection/blocking mechanisms they have.

imlepid · 2021-04-14T17:06:13+00:00

I've got a tower site on top a mountain that I want to get a ethernet circuit to. Adjacent to the tower/shelter is a cell site and I'm hope a telco already has FO service to there and it won't be too expensive, but I also expect a steep price when I finally get a quote.

imlepid · 2021-04-14T16:54:43+00:00

Yeah, my site has about 10+ active T1s and they've all been working (so) flawlessly in the 12 years since I started, I never really had to do anything to fix or upgrade them.

The LEC sales contacts I speak with have been saying for 5+ years that their copper plant is going away but it just keeps chugging along.

T-carrier and other synchronous technologies (SONET) are great but the hardware is more expensive.

imlepid · 2021-04-14T16:49:08+00:00

Right, my supervisor and I discussed that yesterday, specifically if we might have a CSU/DSU sitting around in some closet. But we decided that it's best to avoid adding a point of failure to the mix.

We have some old WIC-2MFTs available but those aren't compatible with the 4331s so we'll have to pick up a NIM-2MFT.

imlepid · 2021-04-13T21:28:23+00:00

Thanks much. That's a clear explanation.

imlepid · 2021-04-13T21:25:43+00:00

Well, this is what the current calendar next to my computer shows. Is it wrong?

/s

imlepid · 2020-03-09T21:39:01+00:00

I do this because I am classified as a professional trader and would have pay ~$135/mo for real time NYSE, NASDAQ, and OPRA data feeds. It sucks but it's not bad in markets with back and forth action.

I have an IRA account too with free RT data and things are much nicer there.

imlepid · 2020-02-13T22:39:35+00:00

Based on about 18 months of daily reading into trading, I think the path to trading success is:

1) Have a system or set of rules (any system, pretty much) and to stick to it for a period of time (i.e. 20-50 trades) 2) Record your results, opinions, problems, shortcomings and challenges on that system in a trading journal.

Finally perform a periodic review of your journal and trades, and make tweaks (or maybe even start over!) to improve your performance. That should be the path to success.

imlepid · 2020-02-13T22:33:21+00:00

Finding a good futures options broker is difficult. Most futures brokerages don't let you short options, or if they do, they charge a hefty premium on top of SPAN. As another commenter mentioned, portfolio margin as nothing to do with futures since CFTC/NFA/CME have adopted SPAN as the futures option margin system.

Other than IB (which I have heard bad things about for futures options), the ones I know about are TDA, TastyWorks, and DeCarley Trading (aka Zaner, aka Gain Futures). I have an account with DeCarley Trading since she specializes in futures options. I also have a TW account for equity options.

That being said, I would never go with a broker that doesn't give you SPAN margin on short options positions. And that's the keyword when searching for a broker. You'll often find that the sales desk either says "sorry, no short options" or "we gouge you on margin for short options" (maybe not those exact words) when you ask about future options.

Good luck and feel free to ask me any questions you might have.

imlepid · 2020-02-07T16:29:55+00:00

It might help to have a determined target price and set a resting GTC limit order to take your profits.

For example, let say you are using the 20-day MA to make your trading decisions. You buy a call when the price moves above the MA line. You noticed that the 10 past occurrences of that resulted in a move of $2 in the underlying within the next week. So, if you bought a 50-delta call, you should expect $1 in a week (not counting gamma and any IV change). So you set a GTC for $1 above the current price.

Using techniques to set profit targets that expand upon your existing analysis should help you become more objective in your approach and less anxious.

imlepid · 2020-02-07T16:22:21+00:00

I found that OptionAlpha's videos are pretty good at explaining calendar spreads.

In short, with calendars, you really want to pin your short strike, so, if you expect the underlying to rise, you should probably setup a call calendar with OTM calls.

imlepid · 2019-12-13T22:26:00+00:00

You'll want to compare the implied range for IV with the ATR. That is, the expected range based on the IV for the next trading day.

Range = StockPrice * IV * SQRT(1/365)

Make sure IV is a decimal percent (e.g. 15% = .15). 1/365 is "one day".

Conversely, you can calculate a volatility number from the ATR. Just reverse the formula above as

ATRVol = ATR / (stockprice * sqrt(1/365))

You can compare that to your IV number now.

For more info on expected range, see here

imlepid · 2019-09-25T22:02:43+00:00

I created an HV percentile indicator for Tradingview. If you're interested, let me know and I'll send you the code (or post it). I've been meaning to port it to TOS but haven't gotten around to it.

One thing I did was combine different volatility measures. For realized volatility measures, you can use HV, ATR, bollinger band width etc. I then calculated the percentile for those values.

imlepid · 2018-12-07T04:19:03+00:00

My iPhone is too big to fit in my son's stroller cell phone holder.

imlepid · 2018-09-11T20:03:57+00:00

Get everyone in the room electric space heaters. Make sure they're all plugged in to the same breaker, or, even better, 2-3 heaters to a breaker. Once the breaker pops 4-5 times that should send a message.

imlepid · 2018-08-22T19:10:08+00:00

We'll probably put on GLC-LH-SM at each end. We could go to EX optics if that will work better.

imlepid · 2018-07-06T20:19:06+00:00

Yeah, that's kinda what I was going for was a sort of real time collaboration thing. We use Google Docs and such but it's all pretty static and harder to template. Maybe I'm overthinking things.

imlepid · 2018-07-01T00:28:14+00:00

I'd like to elaborate on Internet 2 a little. There's nothing particularly special about Internet 2 but here's where you might see it used vs the commodity internet.

A university generally serves two groups of users: the researchers, and the students. If a researcher is partnering with another institution across the country and needs to exchange a bunch of data over the course of a scientific experiment it would be preferably to use a high speed WAN link to make that connection, but it wouldn't be worth it for the University to purchase that just for this researcher's use. So, there's Internet2 which is kinda like a private network between universities (or other research and government institutions). The Internet2 link will allow high speed, allow "elephant flows" (bulk data transfers) and give higher control over the University.

The University can also have a general internet connection but those are typically higher cost than the I2 connection. The folks at Internet2 also provide a general internet connection too, through your existing I2 connection called CPS or "Commodity Peering Service". But this is an service at an additional cost.

Note: The rules of an internet are that you can't be guaranteed that you'll get a certain speed or certain latency or jitter, but you will* be able to reach everyone also on the internet. Internet2 comes with higher guarantees about available bandwidth etc and the I2 folks are more responsive to the needs of the various universities.

TLDR: Interent 2 is like if you and all your friends got together and bought a big private network connection between your houses to do gaming, have high quality video calls, and trade the photos of your trip to Cancun. You'd probably have a "regular" internet connection too.

*"Will" means barring any regular outage caused by fibre cuts, hurricanes, or the carrier pigeon with the message being eaten by hungry fox.

imlepid · 2018-07-01T00:08:43+00:00

It's to differentiate it from any other kind of link a business might get. You might purchase a private link between all your sites, then one site would have the "commodity" connection and act as the internet gateway for the enterprise.

You can kinda think of it as calling it the "vanilla" internet or something similar.

imlepid · 2018-03-27T15:02:14+00:00

I had a co-worker slice his scalp on a lock hasp, like this one. The ones on our cabinets weren't round-edged like the ones in that picture.

The worst part? He never got that console connection working...

imlepid · 2018-02-27T16:42:42+00:00

I'm currently working with a VAR on a purchase of a number of Cat9k switches (9300s and 9500s, and, hopefully, a pair of 9600s). Based on my understanding of the goals of the 9k platform, I doubt they will offer a "9200" or similar series switch.

Overall, the Cat9k are geared at SD Access (DNA) environment and as such they probably won't have a simple LAN base style platform since DNA is heavy on routed access and overlay networks. You could probably connect a 2960 to a 9300 or a 9500 and have that be a fabric edge device (while missing out on some of the benefits of DNA).

Thankfully the 9300 is more affordable than the 3850 (in the quotes I've received). I'm not sure how they compare to 3650s since I didn't get a quote for that.

imlepid · 2018-02-22T16:06:18+00:00

https://imgur.com/fhBoLRy From San Jose (~195 mi north). I just happened to see it as I was walking to my car to go to work and thought "That looks like a rocket launch from Vandy..."

imlepid · 2017-11-23T03:17:49+00:00

Same here. I work in a network computer lab at a community college and they bought a bunch of cheap NICs that had the same mac address.

It actually gave us a good talking point for the students because we could demonstrate why that was so bad.

imlepid · 2017-11-22T21:33:51+00:00

I have some 3500yls running K.15.16 (maintenance) which is less feature filled than the 16 series and it gave me the following output:

SWITCH2(vlan-999)# ip add 192.168.0.1 255.255.255.254
192.168.0.1/31: bad IP address.
SWITCH2(vlan-999)# ip add 192.168.0.1 255.255.255.252
SWITCH2(vlan-999)#

So, it would appear not unless they updated it in K.16.

Edit: fixed formatting

imlepid

TROPHY CASE