Firewall & Ports

[m4cc45]

Hi,

I'm just trying to get my head around something.

Essentially:

Firewall port 80 open

Now I know that when I hit port 80 the source port from a client PC is actually a random port due to the fact that I know it uses a random port to stop collisions. So source port might be 50000 or such like. I'm looking into why this works when only port 80 is open - does it tag the packet (like VLAN)? I'm sure I have some videos on this but my mind has gone completely blank.

If someone has a diagram of the packets both ways that would be great.


M.

 

[m4cc45]

Correct - that's the bit that's fine in my head.

Say I have a http web server.

So I allow port 80 on my browser and port 80 on the webserver. Is that enough ports to allow as I know it's going to be randomised outgoing on the client. Or do I need to allow all of the high ports on the client?



M.

 

[m4cc45]

That's fine - I'm wondering about outbound from the webserver and inbound on the client.

Assume from the webserver it's just port 80 but what about the client?



M.

 

[m4cc45]

Ta. That's what I thought.

Thanks!



M.