Understanding forwarding tables in LAN transparent bridging

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I am having some trouble understanding how transparent bridging works. With this diagram, I am told that:

After initialization (none of the transparent bridges has state information), the following six frames are sent: 1: A -> D 2: B -> A 3: C -> B 

I don’t really get what A->D actually means. A frame is being sent from A to D? Or are these both frames?

By definition, I know that whenever a frame is received, we add an entry to the forwarding database (if it does not yet exist).These are the forwarding tables after the exchange of the 3 frames but I don’t understand how they’re derived exactly. Any example would be helpful.

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ngrok port forwarding not working

I am currently using ngrok for port forwarding. I am interested in gaining access to my android phone which is connected through mobile network. I am using kali linux in virtual machine and connected through nat network (i am not using wireless adopter). Now, after starting ngrok when I am creating a msfvenom payload for android the LHOST= ip of ngrok tunnel LPORT=ngrok port In msfconsole LHOST= LPORT= 4444. But this is not working. I don’t know what is wrong.

Port forwarding

I have a VM machine (Kali Linux) using NAT Network. I am trying to configure the router to forward connections to Kali on port 80. The local IP of Kali is and my local IP is Virtual Server

When I try to save this, I get:

Error code: 4937

The IP address is not in the same subnet with LAN IP address. Please input another one.

What am I doing wrong?

Port Forwarding Port 80 to PS4 – what about other devices on port 80

I would like to forward several ports, including port 80, to my husband’s PS4 for gaming purposes. On our network I know that there are a few other devices using port 80, notably a nanny-cam. These other devices are ONLY used locally and I do not wish for them to be accessible to the internet.

Presumably, forwarding port 80 to the PS4 will direct all traffic there and will not expose the other devices to nefarious bots looking to access them. Is this correct?

In case it is relevant, we are in a very rural setting, so physical access to our network by a ne’er-do-well is highly unlikely. Our initial router is one provided by our ISP, which is then hard-wired to a second router set in bridge mode. All devices on our network operate off the second router.

CSF IP Forwarding

When using CSF IP forwarding on VM A to VM B
All traffic reaching to VM B will be from a single source "VM A", how can I get the o… | Read the rest of http://www.webhostingtalk.com/showthread.php?t=1775798&goto=newpost

Forwarding e-mail from O365 Groups to main mailbox [on hold]

I am getting e-mails from MS Planner to Groups in Outlook, I want to forward them automatically to main email box, or different user (doesn’t matter) so it can be a trigger for MS Flow.

Because for now, there is no way to trigger it from Groups Email.

Any ideas how this can be achieved?

I found this approach: Office 365 Group email forwarding but it will not work, cause if I will delete the Group it will automatically delete everything combined with this Group, additionally account will stay in SharePoint memory as used account.

Many Thanks,


ubuntu 18.04 disable ip forwarding permanently

does anyone knows how to disable ip forwarding permanently on Ubuntu 18? I don’t want any device connected via Ubuntu Hotspot to be able to reach any remote subnet, not even the Internet.

I manually edited /etc/sysctl.conf like this: net.ipv4.ip_forward = 0 and reloaded the NT Manager, so I would get

$ sysctl net.ipv4/ip_forward

net.ipv4.ip_forward = 0

After this, I tested the configuration. I created a WiFi Hotspot and I got this:

$ sysctl net.ipv4/ip_forward

net.ipv4.ip_forward = 1


$ cat /proc/sys/net/ipv4/ip_forward


which is not what I wanted. So, how could I disable ip forwarding permanently?

I need help forwarding utm parameters from facebook, through a landing page, to outgoing links [on hold]

Essentially i need to pass subid information via dynamic utm parameters from facebook ads to my clickbank (uses tid for sub-id tracking) offer link found on my landing page.

I dont know really anything about javascript or jquery but ive found other threads about this and tried to out it in my website but it didnt work so if anyone can help i’d really appreciate it

which TLD for forwarding nameserver?

I want to setup 2 forwarding name servers with powerdns for customer sites.

My question is if it matters the domain under which the name servers will be registered.

Godaddy panel – for what I recall – has a check box that declares the domain as a name server followed by the name we want to assign.

Suppose I buy example.xyz and assign nameserver ns1.example.xyz. Will I have any problem compared with a registered name example.com and nameserver ns1.example.com?

If you disagree with the process don’t hesitate to write your opinion.

Thank you.