Go for the first example sort of example is saying that you have a mixed crowd.
And on this market they cropped up on Ethan at five.
The packet is coming to Ethan at five and is leaving also at five.
So for example if you are making from your computer bank to the router than dipping going from a computer
internet 5 and the reply is coming out from internet 5 or for example if you're making a connection
via Winbox to the router so it's to internet 5.
If you have a cable between it and a 5 on the router and then reply to you from me then at 5.
OK so now we need to see how the package is going to be flow if it's going from Ethan at 5:00 today.
And it's not 5 to less to follow the the picture.
So first it arrived to it and at 5:00 it's in a physical interface.
It comes here and they say is it in that five part of the bridge.
And we see here there is no bridge so it will say no.
Then the packet will continue its way and it goes to here then it is that IP packet IP packet is normally
when you are going from one IP to another IP.
In our case yes it is an IP traffic.
Then if we go to the the process of the routing and here it goes to the other end here what you can
do when you know that that is inside the green routing then you can go to the the chain and then you
can see OK on the what I can do here.
OK.
And then you can check what you can do on the pre-rock.
But let's not follow the example.
So it goes to rerouting and then from pre-loading it goes to the routing decision then the routing decision
would say are you going to another port or you are going to stay simple.
That means you are forwarding the packet somewhere or you are going to the router itself.
In my case we said that its going to the out the because thats it being routed or Winbox then it has
to go to the impled.
Then again we are an input channel.
You can see what you can do in email if we go back here or less three and then and then we'll chat.
What I can do for example I can make the rule here on the booth and say I want to drop any pings to
my router and thats when you can do with that's different.
Let's continue the example.
So here when it goes to the input then it will forward it here up that it would go to the local process
and the local process as well.
The process of the packet happens.
That means if if there is a being that is in one box then all those traffic happen there then this packet
is sent to that other process and then to the local out.
And that it would go to the this box of IP version 4 or IP version 6 traffic.
Then if it's yes or if it's not now in my case it is yes or it's an IP diversion for the to go here.
Yes the decision to the output.
Now also can do something on the output if you want to go to the post trouting it go down here and it
will go to here it say this is the old interface is that the part of the Bridgeport here.
We are not on a bridge that is no it's not part of the Bridgeport.
So with go you know and here we go to the interface HTB that's where we can do the quality of service.
And then as we go to the physical interface and if we go out from five again.
So you can see this is the process when you want for example to make to the router.
And when you want to make when most of the connectivity as an example packet going to the router.
So it is the first example that I want to show you.
Let's go now to the second example.
The second example is saying OK we have the router here.
So this is my router and all ports are inside a bridge.
So I have all ports in a bridge and the packet is going to go from it and that's fine.
Actually it's not why it has to go.
It's either that one and then go outside at 5 and eat another one and eat another five.
Both are inside the same bridge.
So let's see how the package will flow that comes to the next one.
And then it will say is it enough on part of the bridge.
Yes it is.
Then it will go to the rich box here and the bridge destination that it would go to the bridge decision
the British decision saying are you going to airport inside the same bridge or you go into a port which
is outside the bridge.
So in my case we have to go into a vault inside the same bridge we go to it and I find that it will
send it to the bridge forward.
OK.
When the port is inside the same bridge that has to go the bridge forward.
Then as we go here to the bridge or stop then if we go down that goes here then it will go this way
to here and that it will go out from Italy at fine.
OK.
So as soon as that didn't pass you can see it didn't touch the wrong box.
It has only passed through the bridge box.
OK.
So I hope now it's more clear for you how difficult this flow inside my crew.
Let's do another example.
OK an example number three we have no bridge and we see that the packet needs to go in either that one
end.
So and then it needs to go out from it and that's fine.
Let's see how the will flow.
So it arrives through that one and then it comes to here.
Is it part of a bridge.
No it does not.
There's no bridge you go to IP version 4.
Is it an IP traffic.
Yes it is.
Then it will go here to rerouting rerouting send it to the routing decision routing decision say are
you going to do it after all you are passing the traffic through the router so that the traffic is passing
through the router to go from it and I find that if we go to the forward time and and before we send
it to push trouting post routing send it through here and then it comes to here then it will say Are
you part of the bridge.
And in this case no I'm not.
And then it would go this way that if we go out of it at 5:00.
So you can see in this case you can't do mangle you can do filtering if you want.
On the forward as an example because you pass through this train.
Right.
Now another example.
I hope that you are following me and I'm not going very fast Actually it's straightforward.
You can see the back flow.
It's very complicated if you look at it from without the other side.
But once you understand it you can see that it's not that difficult.
We go to example number for example Number four we have two bridges.
First bridge is having it in and too.
And the second bridge has it in for anything not five and the back it needs to go from the not want
and go out from Ethan at 5 OK.
So let's see how the chart looks like now.
So it comes to eating out of one here and that is to say Are you part of the bridge and in this case.
Yes.
And as long as part of the bridge.
And then if we go to the rich decision and then the bridge decision say are you going to a which is
inside your Pritch or you're going to another form.
So that means you have to forward it.
Then in this case I'm not sending the packet to a port which is inside the bridge.
And what I need to do now I need to send it to a port which is in another bridge then we have to go
to reach it.
OK so before we see the other example if want to bridge forward.
Now we go to Rich in both and then with we go Here we go to here you an IP version 4.
Yes.
So it's an IP packet.
Then it we go to the pre-roll think and then to the routing decision they say how are you going to do
it all.
Are you going the other off of the phone.
So I'm going to the other either.
So then in this case if we go to forward post trouting go down here and that it comes to the interface
which is our interface which for that is going to say Are you part of the bridge.
So it's not five.
It's part of another drive.
Then if it is yes then it goes here.
Yes bridging decision than it would go to the bridge.
Both Be careful bridge output here is different than a bridge inputted those that are two different
bridges.
OK.
Then as we go to the bridge sosh Now that goes here it goes through here to the physical interface and
then it goes from it dinner at 5:00.
OK.
So this is an example when you have to portion two different approaches and then now the last example
that I want to show you the see.
Now we have one bridge which is having either that one and two inside of it and the packet needs to
come to the next one which is inside that bridge and go out from Ethan at 5.
So the bucket would come through it and that one needs to go out from it and that's five.
And let's see how the bucket will flow that comes to that one.
And then this is part of the bridge.
Yes it is.
It goes down and that it goes to the bridging decision and then it will say you're going to a port which
is inside that bridge or you're going to another part that it's going to another port.
Then it goes to the bridge and then it goes to the IP version for you back over IP version 4 traffic.
Yes then it goes to the rerouting and then to that we go to the routing decision then it will check
if it's going to outside the router or it's going to Putney's to go to the router itself.
So it's going to another part of the office or outside go to the for post routing.
Then it goes here then to here is not part of the Brigitta not 5 anymore.
That goes here here here and then it goes out from within at 5:00.
So again when you know where and which chain when you are on the routing it is then you can look to
the chain and then you can see where you can if you can do any firewall or any Mongul any or not for
example on that.
So then there's the packet flow that I want to do something new I can't about the routing and the bridging
only.
You can also look for the site for bridging firewall.
Also you can add the firewall and see if you want to do firewall the breeching.
We can also look on the V line because then you can use the explanation D-cup solution but this is the
most important part.
Dropping the bridging because that's what is mostly used.
So I hope with those examples and with this explanation you could understand what this did Paxo you
can not find that it's really all love anywhere.
It's really a struggle even for instructors to stand up all the backflow in my critique.
But I think that the way I have made it for you it should be more easy and clear to be understandable.
I hope that you enjoyed this lecture and I wish you and the OP and.