TTFB

Does ttfb includes dns lookup? Read multiple articles but still not sure.

Long Range High Speed Wireless Networking

All,

I'm in need of some input. The short version is I need to cover a wind farm site with a wireless network capable of fast uploads. There are multiple mobile devices that need to connect to this network and upload large amounts of data. Sites are up to 11 miles across. Is there a cost-effective solution for this? I was looking at 900MHz but it looks like it's going to be too slow and a pain to obtain compatible hardware.

If you can't interact with a machine that is not listening on port 80 (most home users) how is it possible for hackers to take it over?

I am reading about IP's to improve my AWS knowledge and came across this on reddit:

Now, let's say your IP is 8.8.8.8
. I type it into my browser and press enter. What happens is my browser generates a generic web request for 8.8.8.8
on port 80. Unless you're running a web server like apache and have configured port forewarding, your router won't respond, because it isn't listening for incoming packets on port 80 (or any port). This is good, because it means there is no way for outside users to even talk to your computer or flood it with packets.

Yet still, all around the globe computers of people that don't even know what a router IS get remotely controlled. Did all of them open port 80? Must it be port 80 given that's what the browser will look for, or you can work some tricks to connect any type of port as long as it's open?

Mind you I understand how a computer can become infected with malware that deletes your files. I don't understand how a hacker may "open" a computer for requests from the web.

Fun projects to do with a /29 block?

Howdy Folks,

I got a /29 from my ISP and have had it running stable for a few months. What interesting and educational routing projects can I do with this block?

I'm open to many ideas. FWIW I have a large home lab (on prem email, web services, corporate domain etc).

At the moment, I just push guest WiFi over a different address to my "core" network. That leaves 3 usable addresses free.

How to send a request to ipv4 or ipv6 network dynamically

Now I'm on a network supporting ipv4 and ipv6. But I need to configure the network route manually to choose ipv4 or ipv6 network. Are there any smart methods to choose ipv4 or ipv6 route dynamically?

2 networks,.1 internet connection?

So we have 2 houses on our farm. The first house has the internet/router from the ISP. I've run a.. like 300ft ethernet wire over to house 2. Which goes to a switch then ethernet to each room in house 2, with a wireless router attached, it has its DHCP setting turned off. So everything gets its 192.* IP from the ISP router in house 1.

What I would like to do is have house 2 on its own network but still able to get the internet from house 1. Access from either house to either house isn't necessary but I guess would be ok.

The problem we are having is all of our Google home and smart devices between houses are getting intertwined on the same network so it now makes sense to seperate them if possible.

Thanks!

Unable to get ICMP responses from Route Reject

Hello People, i am new here.

​

i am studying with the junOS system , 14.1

​

i am trying to do the following:

i will like to set up a routing option , static , with the ip 0.0.0.0 , Reject

(set routing-options static route 0.0.0.0 reject)

already tried with /0 or /32

when i create such option, i commit and when i run the ping , i do NOT get any response , no ICMP message of ''destination unreachable''

​

any advice?? im stomped

PSA: Owners of Nexus 7004/7010's, it's time to clean your filters.

If you have a Nexus 7004/7010 there is a good chance it has an air filter installed. After approx 5-8 years of operation these filters will become clogged with dust and start to overheat the chassis. I'd highly recommend performing the cleaning guide found [1]

To figure out if you do have a filter run the command

7k# show env | grep ig filter Fan Air Filter : Present 

[1] - https://www.cisco.com/c/en/us/td/docs/switches/datacenter/hw/nexus7000/installation/guide/n7k_hig_book/n7k_replacing.html#34596

HTH!

Besides networking, what other subjects do you pursue to keep your mind fresh?

It’s gotten to the point for me now that there’s only so much networking stuff I can read to further my knowledge. Now it just feels like my brain is mush and I think I need to pursue a new subject just to keep my mind fresh and engaged.

One of things I’ve started looking at pursuing in my spare time is psychology, as I’ve always been interested in understanding different personalities.

What sort of subjects do you follow outside of networking?

Is it really this easy?

You know that feeling you get when you know you're forgetting something but you can't remember what? That's kinda how I'm feeling building a 100Gb core.

Is it really as simple as buying this stuff and plugging them in? Or are there some gotchas that I am totally unaware of?

1. $switch_with_qsfp28_ports = C9500-24Y4C;
2. $compatible_qsfp28_transceiver = QSFP-100G-CU1M/QSFP-100G-SR4-S;
3. $fiber_with_correct_terminations = MPO-12 Type B;

I'm upgrading my core from some old Cisco 3750G boxes and it just seems remarkably (and suspiciously) easy to increase the speed by a factor of 100!