Hi,

Working on some 'cosmetics', I would suggest to add a few
"align="center=" (Looks somehow better - please see below):

On 08.09.2017 19:58, Peter Müller wrote:
> Show rDNS/PTR entry and country flag of the used nameservers on the
> nameserver status list at "netexternal.cgi".
> 
> These information might be useful for debugging, or are just "nice to
> have" and do not harm anything. :-)
> 
> Changes since v1: Corrected file link to country.cgi and added title to flag.
> Please disregard the first version of this patch.
> 
> Signed-off-by: Peter Müller <peter.mueller(a)link38.eu>
> ---
> diff --git a/html/cgi-bin/netexternal.cgi b/html/cgi-bin/netexternal.cgi
> index 299612d4c..6fe0cc7d6 100644
> --- a/html/cgi-bin/netexternal.cgi
> +++ b/html/cgi-bin/netexternal.cgi
> @@ -25,9 +25,13 @@ use strict;
>  #use warnings;
>  #use CGI::Carp 'fatalsToBrowser';
>  
> +use IO::Socket;
> +use Geo::IP::PurePerl;
> +
>  require '/var/ipfire/general-functions.pl';
>  require "${General::swroot}/lang.pl";
>  require "${General::swroot}/header.pl";
> +require "${General::swroot}/geoip-functions.pl";
>  require "${General::swroot}/graphs.pl";
>  
>  my %color = ();
> @@ -99,6 +103,12 @@ if ( $querry[0] ne~ ""){
>  						<strong>$Lang::tr{'nameserver'}</strong>
>  					</th>
>  					<th align="center">
> +						<strong>$Lang::tr{'flag'}</strong>
> +					</th>
> +					<th align="center">
> +						<strong>$Lang::tr{'rdns'}</strong>
> +					</th>
> +					<th align="center">
>  						<strong>$Lang::tr{'status'}</strong>
>  					</th>
>  				</tr>
> @@ -139,9 +149,22 @@ END
>  
>  		my $table_colour = ($id++ % 2) ? $color{'color22'} : $color{'color20'};
>  
> +		# Get rDNS entry for nameserver (might be useful)
> +		my $iaddr = inet_aton($nameserver);
> +		my $rdns = gethostbyaddr($iaddr, AF_INET);
> +	        if (!$rdns) { $rdns = $Lang::tr{'lookup failed'}; }
> +		
> +		# Get country flag for the nameserver (might be useful)
> +		my $gi = Geo::IP::PurePerl->new();
> +	        my $ccode = $gi->country_code_by_name($nameserver);
> +       		my $fcode = lc($ccode);
> +	        my $flag_icon = &GeoIP::get_flag_icon($fcode);
> +
>  		print <<END;
>  			<tr bgcolor="$table_colour">
>  				<td>$nameserver</td>

Changed to: <td align="center">$nameserver</td>

> +				<td align="center"><a href="country.cgi#$fcode"><img src="$flag_icon" border="0" align="absmiddle" alt="$ccode" title="$ccode"></a></td>	
> +				<td>$rdns</td>

Changed to: <td align="center">$rdns</td>

>  				<td bgcolor="$bgcolour" align="center">
>  					<font color="$colour"><strong>$message</strong></font>
>  				</td>
> ...
...

Jm2C! ;-)

Best,
Matthias