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networking – ‘Destination Host Unreachable’ when pinging a printer from some hosts on local network


I have a Brother MFC-2700DW on my LAN I’m trying to access from a variety of devices. I’ve assigned a static hostname (ohbrother) and IP ( for it in my OpenWRT router.

What’s bizarre is that some devices are able to access it without issue, and others can’t access it at all.

For example my Windows desktop connected over wifi can print to it, access its web ui, and ping it:

C:Usershulettbh>ping ohbrother

Pinging ohbrother.lan ( with 32 bytes of data:
Reply from bytes=32 time=2ms TTL=255
Reply from bytes=32 time=6ms TTL=255
Reply from bytes=32 time=5ms TTL=255
Reply from bytes=32 time=3ms TTL=255

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 2ms, Maximum = 6ms, Average = 4ms

I’m also able to ping ohbrother from my archlinux server on a wired connection.

Every other device I’ve tried is not able to access the printer. My android phone, my partner’s chromebook, and my archlinux laptop (all on wireless connections) cannot access the web ui. Pinging ohbrother from my arch laptop (gemini) yields “Destination Host Unreachable”:

❯ ping ohbrother.lan
PING ohbrother.lan ( 56(84) bytes of data.
From gemini ( icmp_seq=1 Destination Host Unreachable
From gemini ( icmp_seq=2 Destination Host Unreachable

Investigation so far

I’ve done some research to the best of my ability and found that “Destination Host Unreachable” indicates the device has no ARP entry for the target and cannot find one (source). I ran a tcpdump on my router to look at network traffic while my laptop is trying to ping the server:

root@OpenWrt:~# tcpdump host
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on br-lan, link-type EN10MB (Ethernet), capture size 262144 bytes
09:06:59.857646 ARP, Request who-has printer tell gemini.lan, length 28
09:07:00.873536 ARP, Request who-has printer tell gemini.lan, length 28
09:07:01.886904 ARP, Request who-has printer tell gemini.lan, length 28
09:07:02.903066 ARP, Request who-has printer tell gemini.lan, length 28
09:07:03.916218 ARP, Request who-has printer tell gemini.lan, length 28
09:07:04.927342 ARP, Request who-has printer tell gemini.lan, length 28

As you can see, the laptop is making ARP requests, but no one is answering them.
I repeated this experiment on my Windows desktop (first deleting the ARP table entry for ohbrother), and I can see an is-at response to its who-has request.

I’m not sure how to debug this any further. Does anyone have an idea what could cause this?

ethernet – Why are ARP requests not being received by all hosts on other switches? (Ubiquiti switches)

ethernet – Why are ARP requests not being received by all hosts on other switches? (Ubiquiti switches) – Server Fault

virtualization – Can computers built in minecraft be used to hijack hosts?

As people build more powerful computers in minecraft which can then run programs, is there a way to use those computers to run programs that hijack the host in some way?

Possible contest example would be to use a computer built in minecraft to create a network connection from that computer to a specified target.

There’s a lot between inside the game and the target, but in principle is a computer inside a gameworld not much different than a virtual machine and its relationship to its host?

Will this become exploitable and worth considering?

linux networking – How can I set up a layer 3 bridge using Proxy ARP such that http requests can be made to the inside/proxied host’s IP successfully?

Currently I am using a Raspberry Pi to bridge an ethernet connected printer to wireless internet and have used DNAT successfully to give the printer internet access, manually forwarding the printer’s port 80 to the Rpi’s wlan0 interface port 80 along with other needed ports to access the printer using outside hosts. I’ve also been able to use Proxy ARP so that the printer’s static IP address is visible on the network, the Pi responding to ARP broadcasts on the printer’s behalf and proxying ARP requests for the printer. What I would like to do is combine the functionality of the DNAT approach with the IP separation provided by Proxy ARP.

The problem is that I cannot figure out how to seamlessly accomplish the needed forwarding/spoofing with the Rpi so that instead of directing requests to the Pi’s port 80, outside hosts can make requests using the printer’s IP directly even if it’s on a different subnet, say, to access the http page.

Is it possible to accomplish this routing in tandem with Proxy ARP? Are there other approaches that are better suited for this arrangement, or could IP aliases alongside DNAT accomplish this illusion that the printer’s IP and active ports are also present on the network/another network?

hosts file – Pulse Secure VPN change the hostname on macOS. How and why does it do it? Is this a security concern?

Once I connect to Pulse Secure 9 VPN on macOS, my host name on Terminal changes. Checking on System Preferences > Network > Advanced... > WINS > NetBIOS Name this is where it’s being set. Why does and how does that happen? Is this a security concern?

Their KB19294 article says

Hosts file is modified/accessed when a VPN Tunneling client is launched
to ensure that the PCS hostname resolves to the same IP which it resolved to before the tunnel was launched

And it seems like my /etc/hosts gets over written and a /etc/pulse-hosts.bak gets created, but the host name is not set there.


  • Maybe my question already contains the partial answer, but it still doesn’t make sense to me.

router – Unknown hostname for the hosts on the same LAN

I am not very experienced in networking. However, i know some fundamentals.

Now, I do have one Raspberry Pi and one laptop connected to same WiFi in my home.

The hostnames are raspberrypi and laptop1.

When I check (modem interface) I can see that both devices are connected to wifi, and their hostnames are correctly identified there.

The ip numbers are:



Then I think that if I make a ping from my laptop, addressing raspberrypi, as follows

ping raspberrypi 

The DNS should resolve name raspberrypi to the ip ( and it should work fine. However, that is not the case. I get unknown host raspberrypi warning.

On the other hand, I am able to ping raspberrypi by ping

This is also valid for ssh or nslookup, etc.

I don’t understand why my router cannot resolve those hostnames and let my pc know about it.

I think I might have some conceptual misunderstanding. So, I will be waiting for any help.


email – Why did my inbox spam increase after I switched site hosts?

I recently switched from GoDaddy over to CloudWays, and after I did, the amount of spam I started getting in my inbox increased massively. I’m curious what would cause this and/or if it simply a coincidence?

Perhaps are certain IP addresses more conducive for being targets of spam? Is this a factor of spam filtration on the web hosts side (as I didn’t change my email client or any settings on my side)?

I’ve seen different spam filtration done on the client / user side settings (ie. Gmail vs Zoho Mail) but I’ve never heard of switching hosts affecting spam. Perhaps anecdotally, there was a site I had setup at HostGator where the spam emails was incredibly high around 100 a day.

It seems like web hosts themselves are affecting spam in ways I can’t control but I don’t know if this is accurate, why it happens, and finally, if I can fix it.

NAT – Two hosts with different private IP addresses but same public IP

I’m studying the NAT-process and I’ve a doubt about addressing. When the NAT translates the private IP address to a public IP address, it can translate, if properly configurated, different private IP to the same public IP . How is it possible that two hosts use the same public IP? I mean, if I ping that IP, would I get a response from both of them?

How do Video Hosts bypass Google Abusive Experience? | NewProxyLists

I see most video hosts in this forum uses pop-under ads but not getting any strike on Google Abusive Experience.
I’m just wondering how do they do it? because Chrome hates pop-under these days.

Small hint from me.

Don’t use abusive ad networks that place extra ads in placements you took. Like RTB based ads in your popunders.
Do not place too many popunders without delay. Always have like 30 secs delay between pops.
Do not use more popunders than 4 per page.
Make sure your popunder doesn’t display malware ads (always ask ad network to remove such ads)
Monitor your website if its get blacklisted somewhere if it is, ask for delist, support of antivirus program will always show you which ad is wrong then ask adnetwork for removal of such ad.

This is how i work.

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