10
votes
Accepted
Why arp -a does not show all devices connected to WIFI?
ARP is the Address Resolution Protocol.
TCP/IP stacks use ARP to map between an IP address (like 10.0.1.1) and hardware (usually MAC) address, like 00:11:22:AA:BB:CC. Because there's overhead in ...
- 315
9
votes
Accepted
Is MQTT scalable with 1000+ clients?
1,000 clients can easily be handled by any decent MQTT broker; there's a benchmark from Scalagent which shows that a PC with:
a 3 GHz Intel Core 2 Duo processor
4 GB of RAM
could handle 60,000 ...
- 18.1k
9
votes
Accepted
How does the Norton Core increase the security of a "smart home"?
There are several differences between the Norton Core and a normal router.
1. Deep Packet inspection. From TrustedReviews.com:
The Core is a combination of Symantec's pre-existing security ...
- 4,642
7
votes
Accepted
How do I protect my home from IoT devices being compromised and being used for DDoS attacks?
The virus you've heard about is probably Mirai.
We've had a few questions recently that might be helpful to read for context, because your question covers several aspects of those:
How can I check ...
- 18.1k
7
votes
~200 Devices on Single AP
From the sounds of what you're trying to do I think you'll be fine, and obviously the outcome will depend on the router you get. (I'm going to use Ubiquiti as an example)
According to a Ubiquiti ...
- 219
6
votes
How do I protect my home from IoT devices being compromised and being used for DDoS attacks?
@Aurora0001 has already addressed the big things: undoubtedly, a Mirai attack you heard of.
As he said, change your passwords off of the defaults - and not to something obvious. Here's a list of ...
- 4,642
5
votes
How can I handle IP addresses changing when the router reboots with Home Assistant?
Every networked device connected to your router has a MAC address, which is specifically linked to one device, unlike local IP addresses in your private network, which are assigned by your router and ...
- 18.1k
5
votes
How can I handle IP addresses changing when the router reboots with Home Assistant?
The router configuration portal has DHCP-->'Address Reservation' under Advanced settings. This way MAC address to IP address reservation can be achieved.
- 241
5
votes
How do I protect my home from IoT devices being compromised and being used for DDoS attacks?
The problem with IoT is that oftentimes you can't or won't get an update to the device, or can't make meaningful security changes to the device. Securing your network is a lengthy discussion with ...
5
votes
Accepted
Zigbee network intermittent issues
It is important to identify whether the problem is :
Devices or network deployment
Devices or network configuration.
Devices Hardware (or firmware versions)
Environment
Security configuration
The ...
- 951
5
votes
Is MQTT scalable with 1000+ clients?
You can use persistent sessions from clients, e.g. clean flag set to false upon connect. In that scenario event when your client is offline broker will buffer message for it into own cache and deliver ...
- 766
4
votes
Accepted
Avoid limited connections of WiFi Router
A more structured allocation might be better, because you are very tight for available time slots. I think you need to run some monte-carlo simulations of your proposed system too (and check that you ...
- 10.3k
4
votes
How does the Norton Core increase the security of a "smart home"?
I'm pleased to see that this product exists, and hope that other vendors of routers follow suit.
The solution to recent consumer IoT security problems lies in the intelligence of the home network ...
- 1,483
3
votes
How to connect 1 million devices over Layer 3 IP-protocol
I feel your approach is flawed by your 5th point: "I need to keep the per-device cost low, so cannot put Ethernet on each device."
Look at it versus "I'll reinvent a layer 1 protocol and all the ...
- 506
3
votes
Accepted
Will disabling my network's SSID broadcast cause my WPA encryption to be disabled?
No, the connection will still be encrypted, but the services that depend on it like WPS (Wireless Protected Setup) won't work. WPS is a simple way to setup the WIFI connection by pressing a button in ...
- 236
2
votes
How do I protect my home from IoT devices being compromised and being used for DDoS attacks?
In addition to very nice discussion above, you can be own security expert starting with nmap, flagship tool from Insecure.Org so you can perform basic scan of target device(192.168.1.1) with simple ...
- 740
2
votes
Accepted
Confused: What is this weird IP address?
This sounds like your ISP is operating CGNAT (Carrier Grad Network Address Translation).
Most home networks normally operate with NAT (Network Address Translation) which means that all the devices on ...
- 12.4k
2
votes
Why arp -a does not show all devices connected to WIFI?
It can, but there's a ~5 minute timeout on unused records in the ARP table. So entries will timeout.
You can probably extend that timeout, but a quicker answer is just to sweep through the IP network ...
- 121
2
votes
Accepted
Router connected to a router: how to cast different things in each router?
One way to get some isolation between your wired networks is for each of you to have your own dedicated router. The WAN port of each of your routers is wired to a LAN port of the ISP's router.
To ...
- 226
1
vote
Can portable routers be connected to power supply for months without damaging their batterry?
It probably won't do the battery much good as Lithium Ion batteries actually prefer to only be charged between 80% and 20% for the majority of the time to last the longest.
If you need a permanently ...
- 12.4k
1
vote
Are there wireless to wireless routers for meshing, and if not why?
The answer to point one is because it's more efficient and cost.
Mesh devices already have at least 2 radios, one to talk to clients and one to talk to other mesh nodes, the master node would then ...
- 12.4k
1
vote
Accepted
How many machines do I connect to a single WiFi router?
We're lacking quite a bit of data, but let's run a few numbers.
If each message is about 1000 bytes, then 10K * 1000 * 8 / 2 = 40 Mbit/s. Not even considering the Wi-Fi part, that's quite a lot of ...
- 1,968
1
vote
Accepted
Access Raspberry Pi behind a NAT firewall through Internet
I have finally resolved the issue. I have used ngork to create virtual tunnel. I tried to use ngork earlier but was unable as I was running the service on port 80. When I ran the nrogk http service on ...
1
vote
Accepted
How IoT device in my local network is controlled from other networks?
All your devices are opening persistent connections out to the cloud. They will be using a messaging based protocol (e.g. MQTT) rather than a request/response protocol like HTTP.
Messages flow both ...
- 12.4k
1
vote
How does the Norton Core increase the security of a "smart home"?
It doesn't have an open telnet port. I still come across lots of residential / off-the-shelf wifi routers with open telnet ports. The firmware is usually available online too, with backdoor accounts. ...
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Only top scored, non community-wiki answers of a minimum length are eligible