diff --git a/net.pl b/net.pl
index 26a45ea4..4957fb39 100755
--- a/net.pl
+++ b/net.pl
@@ -47,7 +47,7 @@
     -d date	set date string and change to sub directory, may be current
     -D cvsdate	update sources from cvs to this date
     -h host	user and host for network link test, user defaults to root
-    -i iface	list of interfaces: all @allifaces
+    -i iface	list of interfaces, may contain number: all @allifaces
     -m modify	list of modify modes: all @allmodifymodes
     -N repeat	number of build, reboot, test repetitions per step
     -P patch	apply patch to clean kernel source
@@ -138,6 +138,11 @@
 print $fh "TESTMODES ", join(" ", sort keys %testmode), "\n";
 close($fh);
 
+delete $ENV{MANAGEMENT_IF};
+environment("$netlinkdir/bin/env-$host.sh");
+my $management_if = $ENV{MANAGEMENT_IF}
+    or die "MANAGEMENT_IF is not in 'env-$host.sh'";
+
 # setup remote machines
 
 usehosts(bindir => "$netlinkdir/bin", date => $date,
@@ -198,16 +203,29 @@ END
     my @dmesg = <$fh>;
     $iface = join(",", @allifaces) if $iface eq "all";
     foreach my $if (split(/,/, $iface)) {
-	grep { $_ eq $if } @allifaces
+	my ($iftype, $num) = $if =~ /^([a-z]+)([0-9]+)?$/
+	    or die "Invalid interface '$if'";
+	grep { $_ eq $iftype } @allifaces
 	    or die "Unknown interface '$if'";
-	unless (grep { /^$if\d+ at / } @dmesg) {
+	unless (grep { /^$iftype\d+ at / } @dmesg) {
 	    if ($opts{i} eq "all") {
 		next;
 	    } else {
-		die "Interface '$if' does not exist in dmesg";
+		die "Interface type '$if' does not exist in dmesg";
 	    }
 	}
-	push @ifaces, "iface-$if";
+	my $numre = defined($num) ? qr/$num/ : qr/[0-9]*[02468]+/;
+	foreach my $ifnum (map { /^$iftype($numre) at / ? $1 : () } @dmesg) {
+	    if (($iftype.($ifnum + 0)) eq $management_if ||
+		($iftype.($ifnum + 1)) eq $management_if) {
+		if (defined($num)) {
+		    die "Cannot use inferface '$if', conflicts management";
+		} else {
+		    next;
+		}
+	    }
+	    push @ifaces, "iface-$iftype$ifnum";
+	}
     }
     @ifaces or die "No suitable interfaces in '$iface' found";
 }
@@ -339,6 +357,31 @@ END
 
 exit;
 
+# parse shell script that is setting environment for some tests
+# FOO=bar
+# FOO="bar"
+# export FOO=bar
+# export FOO BAR
+sub environment {
+    my $file = shift;
+
+    open(my $fh, '<', $file)
+	or die "Open '$file' for reading failed: $!";
+    while (<$fh>) {
+	chomp;
+	s/#.*$//;
+	s/\s+$//;
+	s/^export\s+(?=\w+=)//;
+	s/^export\s+\w+.*//;
+	next if /^$/;
+	if (/^(\w+)=(\S+)$/ or /^(\w+)="([^"]*)"/ or /^(\w+)='([^']*)'/) {
+	    $ENV{$1}=$2;
+	} else {
+	    die "Unknown environment line in '$file': $_";
+	}
+    }
+}
+
 sub mkdir_num {
     my ($path) = @_;
 
diff --git a/netlink-html.pl b/netlink-html.pl
index 208f754c..26f7f109 100755
--- a/netlink-html.pl
+++ b/netlink-html.pl
@@ -263,6 +263,7 @@ sub html_hier_test_row_util {
 	    "iface-ixl"  =>  10 * 10 ** 9,
 	    "iface-bnxt" =>  10 * 10 ** 9,
 	);
+	$iface =~ s/\d+$//;
 	my $linerate = $linerates{$iface} || 10 ** 9;
 	my $rate = $value / $linerate;
 	my $style = sprintf(
diff --git a/netlink.pl b/netlink.pl
index 1c607443..ab0b89e0 100755
--- a/netlink.pl
+++ b/netlink.pl
@@ -33,16 +33,14 @@
 my @alltestmodes = sort qw(all fragment icmp tcp udp splice);
 
 my %opts;
-getopts('c:e:i:l:m:r:t:v', \%opts) or do {
+getopts('c:e:i:m:t:v', \%opts) or do {
     print STDERR <<"EOF";
-usage: netlink.pl [-v] [-c pseudo] [-e environment] [-i iface]
-	[-l index] [-m modify] [-r index] [-t timeout] [test ...]
+usage: netlink.pl [-v] [-c pseudo] [-e environment] [-i iface] [-m modify]
+    [-t timeout] [test ...]
     -c pseudo	pseudo network device: @allpseudos
     -e environ	parse environment for tests from shell script
-    -i iface	interface: @allifaces
-    -l index	interface index, default 0
+    -i iface	interface, may contain number: @allifaces
     -m modify	modify mode: @allmodifymodes
-    -r index	interface index, default 1
     -t timeout	timeout for a single test, default 60 seconds
     -v		verbose
     test ...	test mode: @alltestmodes
@@ -58,17 +56,33 @@
 my $modify = $opts{m};
 
 my $line = $ENV{NETLINK_LINE} || die "NETLINK_LINE is not in env";
-my $management_if = $ENV{MANAGEMENT_IF} || die "MANAGEMENT_IF is not in env";
+my $management_if = $ENV{MANAGEMENT_IF}
+    or die "MANAGEMENT_IF is not in env";
 
-# ifN if N is even then it is left, odd means right.
-my $left_ifidx = $opts{l} || ("${iface}0" eq $management_if? 2 : 0);
-my $right_ifidx = $opts{r} || ("${iface}1" eq $management_if? 3 : 1);
+my ($iftype, $ifnum) = $iface =~ /^([a-z]+)([0-9]+)?$/;
+grep { $_ eq $iftype } @allifaces
+    or die "Unknown interface '$iface'";
+my ($left_ifidx, $right_ifidx);
+if (defined($ifnum)) {
+    $left_ifidx = $ifnum + 0;
+    $right_ifidx = $ifnum + 1;
+} else {
+    $left_ifidx = 0;
+    $right_ifidx = 1;
+}
+if (($iftype.$left_ifidx) eq $management_if ||
+    ($iftype.$right_ifidx) eq $management_if) {
+    if (defined($ifnum)) {
+	die "Cannot use inferface '$iface', conflicts management";
+    } else {
+	$left_ifidx = 2;
+	$right_ifidx = 3;
+    }
+}
 
 warn "left interface should be in the wrong network" if ($left_ifidx % 2);
 warn "right interface should be in the wrong network" if (!$right_ifidx % 2);
 
-grep { $_ eq $iface } @allifaces
-    or die "Unknown interface '$iface'";
 !$modify || grep { $_ eq $modify } @allmodifymodes
     or die "Unknnown modify mode '$modify'";
 grep { $_ eq $pseudo } @allpseudos
@@ -95,7 +109,7 @@
 my $ip4prefix = '10.10';
 my $ip6prefix = 'fdd7:e83e:66bd:10';
 
-my $obsd_l_if = $iface . $left_ifidx;
+my $obsd_l_if = $iftype . $left_ifidx;
 my $obsd_l_net = "$ip4prefix.${line}1.0/24";
 my $obsd_l_addr = "$ip4prefix.${line}1.2";
 my $obsd_l_net6 = "${ip6prefix}${line}1::/64";
@@ -104,7 +118,7 @@
 my @obsd_l_addr_range = map { "$ip4prefix.${line}1.2$_" } 0..9;
 my @obsd_l_addr6_range = map { "${ip6prefix}${line}1::2$_" } 0..9;
 
-my $obsd_r_if = $iface . $right_ifidx;
+my $obsd_r_if = $iftype . $right_ifidx;
 my $obsd_r_net = "$ip4prefix.${line}2.0/24";
 my $obsd_r_addr = "$ip4prefix.${line}2.3";
 my $obsd_r_net6 = "${ip6prefix}${line}2::/64";