Re: Problem seeing network scanner thru firewall

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On 01/11/2014 02:45 PM, Sherman Grunewagen wrote:
> [root@neuron ~]# firewall-cmd --list-all
> public (default, active)
>    interfaces: em1
>    sources:
>    services: mdns ssh
>    ports:
>    masquerade: no
>    forward-ports:
>    icmp-blocks:
>    rich rules:

All right.  This confirms that you're using the default zone called
"public" and that indeed you have mdns enabled for that zone so I'm not
sure why isn't working.    You could install tcpdump and try to capture
a few seconds while you try to access the scanner.  This way you could
see the traffic that is originating from your scanner (and that your
firewall may be blocking).  You could do this by:

yum install tcpdump
tcpdump -i em1 src IP-OF-YOUR-PRINTER

I recognize this is kind of advanced stuff if you're not familiar with
networking protocols so perhaps an easier way would be to white-list the
ip address of your printer/scanner so that, any traffic coming from it,
your firewall would allow it.  If you trust your printer not to "hack"
:) your computer you could do this:

firewall-cmd --add-rich-rule 'rule family="ipv4" source
address="IP-OF-YOUR-PRINTER" accept'

Try it. If that works then make the above rule permanent with:

firewall-cmd --permanent --add-rich-rule 'rule family="ipv4" source
address="IP-OF-YOUR-RINTER" accept'

Please let us know if it works.

HTH,
Jorge


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