On Mon, Jun 28, 2021 at 07:47:53PM +0200, Bern D wrote:
> Hi,
> I use shorewall version 5.2.3.4 with Ubuntu 21.04 with the three network
> interfaces:
> WAN-enp3s0,
> LAN-enp2s0,
> WLAN-wlp4s0
> I think that  after update some _Ubuntu _packets one of my open port 6535 is
> closed.

What packages ?

> See my shorewall rules:
> https://paste.ubuntu.com/p/76bYZFs2FW/
> 
> It seems like port 6535 is open for tcp6 but no for tcp4 (as it was before)
> https://paste.ubuntu.com/p/dvJCkbwcYy/

It shows up in ss:
> tcp        LISTEN      0           4096                              *:6535   
>                            *:*

But netstat shows only:
>tcp6       0      0 :::6535                 :::*                    LISTEN

I'm not sure if that's a semantic difference or if it's just how the tools show
the same thing.

If a connection is rejected or dropped, show that in tcpdump or a logfile ?

-- 
Justin


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