diff --git a/check_eth b/check_eth
new file mode 100755
index 0000000..650db60
--- /dev/null
+++ b/check_eth
@@ -0,0 +1,181 @@
+#!/usr/bin/perl -w
+
+use strict;
+use warnings;
+use Getopt::Long;
+
+use constant BITS  => 8;
+use constant BYTES => 1;
+
+my $iface     = "";
+my $bandwidth = "";
+my $warning   = "";
+my $critical  = "";
+my $percent   = "";
+
+GetOptions(
+    "i|interface=s" => \$iface,
+    "w|warning=s"   => \$warning,
+    "c|critical=s"  => \$critical,
+    "b|bandwidth=s" => \$bandwidth,
+    "p|percent"     => \$percent
+);
+
+my $bitmod = BYTES;
+
+my $tmpfile = "/tmp/traffic";
+my $output  = "";
+my $line    = "";
+
+my %status = ( 'OK'       => 0, 
+               'WARNING'  => 1, 
+               'CRITICAL' => 2, 
+               'UNKNOWN'  => 3 
+           );
+my $exit_status = $status{OK}; 
+
+my %data = ( 'time'    => 0, 'last_time'    => 0, 
+             'rxbytes' => 0, 'last_rxbytes' => 0,
+             'txbytes' => 0, 'last_txbytes' => 0
+         );
+
+my %speed = ( 'tx' => 0, 
+              'rx' => 0, 
+              'interval' => 1 
+          );
+
+usage() if ( !$iface || !$warning || !$critical ); 
+if ( $percent ) {
+    usage() if ( !$bandwidth || $bandwidth !~ /^\d+[kKmMgG]$/ );
+    usage() if ( $warning !~ /^\d{1,3}$/ || $warning>100 || $critical !~ /^\d{1,3}$/ || $critical>100 );
+    $bandwidth = human2bytes($bandwidth);
+} else {
+    $warning = human2bytes($warning);
+    $critical = human2bytes($critical);
+    usage() if ( !$warning || !$critical )
+}
+usage() if ( $warning > $critical );
+
+open ( NET, "</proc/net/dev" ) or die ( "Can't open /proc/net/dev: $!" );
+while ( <NET> ) {
+    chomp();
+    if ( $_ =~ /^\s*$iface\:\s*(\d+)(?:\s*(?:\d+)){7}\s*(\d+)(?:\s*(?:\d+)){7}\s*$/ ) {
+        $data{time} = time - 1; 
+        $data{rxbytes} = $1; 
+        $data{txbytes} = $2;
+        last;
+    }
+}
+close( NET );
+
+if ( $data{time} == 0 && $data{rxbytes} == 0 && $data{txbytes} == 0 ) {
+    exit $status{UNKNOWN};
+}
+
+if ( open( TMP, "<$tmpfile-$iface" ) ) {
+    my @line = <TMP>; chomp( @line );
+    ( $data{last_time}, $data{last_rxbytes}, $data{last_txbytes} ) = split( ":", $line[0] );
+}
+
+if ( open( TMP, ">$tmpfile-$iface" ) ) {
+    print( TMP "$data{time}:$data{rxbytes}:$data{txbytes}\n" );
+    close( TMP ); 
+}
+
+$data{last_time} = $data{time} if ( !$data{last_time} || $data{last_time} > $data{time} );
+$data{last_rxbytes} = $data{rxbytes} if ( !$data{last_rxbytes} || $data{last_rxbytes} > $data{rxbytes} );
+$data{last_txbytes} = $data{txbytes} if ( !$data{last_txbytes} || $data{last_txbytes} > $data{txbytes} );
+
+$speed{interval} = $data{time} - $data{last_time} + 1;
+$speed{rx} = ( $data{rxbytes} - $data{last_rxbytes} ) / $speed{interval};
+$speed{tx} = ( $data{txbytes} - $data{last_txbytes} ) / $speed{interval};
+
+$output = "RX Bytes: ". bytes2human($data{rxbytes}) ."B, TX Bytes: ". bytes2human($data{txbytes}) ."B; ";
+$output .= sprintf( "RX Speed: %s%sps, TX Speed: %s%sps; ", 
+           bytes2human($speed{rx}*$bitmod), ($bitmod==BITS)?"b":"B", bytes2human($speed{tx}*$bitmod), ($bitmod==BITS)?"b":"B" );
+
+if ( $percent ) {
+    if ( ( $speed{rx} / $bandwidth ) * 100 > $critical || ( $speed{tx} / $bandwidth ) * 100 > $critical ) {
+        $exit_status = $status{CRITICAL};
+        $output .= "CRITICAL";
+    } elsif ( ( $speed{rx} / $bandwidth ) * 100 > $warning || ( $speed{tx} / $bandwidth ) * 100 > $warning ) {
+        $exit_status = $status{WARNING};
+        $output .= "WARNING";
+    } else {
+        $output .= "OK";
+    }
+} else {
+    if ( ( $speed{rx} > $critical ) or ( $speed{tx} > $critical ) ) {
+        $exit_status = $status{CRITICAL};
+        $output .= "CRITICAL";
+    } elsif ( ( $speed{rx} > $warning ) or ( $speed{tx} > $warning ) ) {
+        $exit_status = $status{WARNING};
+        $output .= "WARNING";
+    } else {
+        $output .= "OK";
+    }
+}
+
+$output .= " bandwidth utilization";
+$output .= sprintf( " | rx=%.0f;%2.0f;%2.0f tx=%.0f;%2.0f;%2.0f", 
+           $speed{rx}*$bitmod, ($percent)?$warning*$bandwidth/100:$warning, ($percent)?$critical*$bandwidth/100:$critical, 
+           $speed{tx}*$bitmod, ($percent)?$warning*$bandwidth/100:$warning, ($percent)?$critical*$bandwidth/100:$critical );
+
+print "$output\n";
+exit( $exit_status );
+
+
+# helper function
+sub bytes2human {
+    my $bytes = shift;
+    return 0 if !$bytes;
+
+    my @units = ( '','K','M','G','T' );
+    my $offset = 0;
+
+    while ( $bytes > 1024 ){
+        $bytes = $bytes / 1024;
+        $offset++;
+    }
+    return sprintf( "%2.0f%s", $bytes, $units[$offset] );
+}
+
+sub human2bytes {
+    my $value = shift;
+    return 0 if ( !$value || $value !~ /^(\d+)(\w)$/ );
+    my ($number, $scale) = ($1,$2);
+
+    my $bitmod = ( $scale =~ /[kmg]/ ) ? BITS : BYTES;
+    my @units = ( '','K','M','G','T' );
+    my $offset = 0;
+
+    while( $units[$offset] ne "\u$scale" && $offset <= scalar(@units) ) {
+        $number *= 1024;
+        $offset++;
+    }
+
+    return $number/$bitmod;
+}
+
+sub usage {
+    print <<EOU;
+
+    Usage: $0 -i <interface> -w <warn> -c <critical> [-p -b <bandwidth>]
+
+    -i, --interface STRING
+        Network interface name (example: eth0)
+    -w, --warning STRING
+        Warning interface speed level (K/M/G Bps, k/m/g bps)
+        If using with -p value should be in percentage (1-100)
+    -c, --critilcal STRING
+        Critical interface speed level (K/M/G Bps, k/m/g bps)
+        If using with -p value should be in percentage (1-100)
+    -p
+        Calculate warning and critical levels in percentage based on interface bandwidth
+    -b, --bandwidth STRING
+        Interface bandwidth value (K/M/G Bps, k/m/g bps)
+
+EOU
+unlink($tmpfile);
+    exit $status{UNKNOWN};
+}
diff --git a/check_iowait.sh b/check_iowait.sh
index edd5c3f..efc87b4 100755
--- a/check_iowait.sh
+++ b/check_iowait.sh
@@ -1,34 +1,32 @@
 #!/bin/bash
 
-if ! command -v iostat &> /dev/null; then
-    echo "iostat not found! Please install sysstat:"
-    echo "sudo apt install sysstat"
-    exit 1
+if ! command -v iostat &>/dev/null; then
+  echo "iostat not found! Please install sysstat:"
+  echo "sudo apt install sysstat"
+  exit 1
 fi
 
 if [ "$1" = "-w" ] && [ "$2" -gt "0" ] && [ "$3" = "-c" ] && [ "$4" -gt "0" ]; then
-	IOWAIT=`iostat|sed -n "4p"|awk {'print $4'}|cut -d. -f1` 
-#	echo " ##### DEBUG:	$IOWAIT " 
-        if [ "$IOWAIT" -ge "$4" ]; then
-                echo "IO Wait: CRITICAL - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
-                exit 2
-        elif [ "$IOWAIT" -ge "$2" ]; then
-                echo "IO Wait: WARNING - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
-                exit 1
-        else
-                echo "IO Wait: OK  - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
-                exit 0
-        fi
+  IOWAIT=$(iostat | sed -n "4p" | awk {'print $4'} | cut -d. -f1)
+  if [ "$IOWAIT" -ge "$4" ]; then
+    echo "IO Wait: CRITICAL - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
+    exit 2
+  elif [ "$IOWAIT" -ge "$2" ]; then
+    echo "IO Wait: WARNING - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
+    exit 1
+  else
+    echo "IO Wait: OK  - $IOWAIT % |IOWAIT=$IOWAIT;;;;"
+    exit 0
+  fi
 else
-        echo "$0 v1.0"
-        echo ""
-        echo "Usage:"
-        echo "$0 -w <warnlevel> -c <critlevel>"
-        echo ""
-        echo "warnlevel and critlevel is percentage value without %"
-	echo "
-	echo "EXAMPLE:	/usr/lib64/nagios/plugins/check_iowait.sh -w 90 -c 95
-        echo ""
-        exit
+  echo "$0 v1.0"
+  echo ""
+  echo "Usage:"
+  echo "$0 -w <warnlevel> -c <critlevel>"
+  echo ""
+  echo "warnlevel and critlevel is percentage value without %"
+  echo "
+	echo "EXAMPLE: check_iowait -w 90 -c 95
+  echo ""
+  exit
 fi
-