diff --git a/env-ot14.sh b/env-ot14.sh
index 932ac6f..c4525a9 100644
--- a/env-ot14.sh
+++ b/env-ot14.sh
@@ -19,13 +19,13 @@ LINUX_RELAY_ADDR=10.3.34.34
 LINUX_RELAY_ADDR6=fdd7:e83e:66bc:0334::34
 LINUX_LINUX_ADDR=10.3.36.36
 LINUX_LINUX_ADDR6=fdd7:e83e:66bc:336::36
-LINUX_SSH=perform@lt13
+LINUX_LEFT_SSH=perform@lt13
 
 LINUX_RELAY_LOCAL_ADDR=10.3.56.35
 LINUX_RELAY_LOCAL_ADDR6=fdd7:e83e:66bc:0356::35
 LINUX_RELAY_REMOTE_ADDR=10.3.46.34
 LINUX_RELAY_REMOTE_ADDR6=fdd7:e83e:66bc:0346::34
-LINUX_OTHER_SSH=perform@lt16
+LINUX_RIGHT_SSH=perform@lt16
 
 LOCAL_IPSEC_ADDR=10.4.34.34
 LOCAL_IPSEC_ADDR6=fdd7:e83e:66bc:0434::34
@@ -55,10 +55,10 @@ export REMOTE_IF REMOTE_MAC REMOTE_ADDR REMOTE_ADDR6
 export REMOTE_SSH
 export LINUX_ADDR LINUX_ADDR6 LINUX_FORWARD_ADDR LINUX_FORWARD_ADDR6
 export LINUX_RELAY_ADDR LINUX_RELAY_ADDR6 LINUX_LINUX_ADDR LINUX_LINUX_ADDR6
-export LINUX_SSH
+export LINUX_LEFT_SSH
 export LINUX_RELAY_LOCAL_ADDR LINUX_RELAY_LOCAL_ADDR6
 export LINUX_RELAY_REMOTE_ADDR LINUX_RELAY_REMOTE_ADDR6
-export LINUX_OTHER_SSH
+export LINUX_RIGHT_SSH
 export LOCAL_IPSEC_ADDR REMOTE_IPSEC_ADDR LINUX_IPSEC_ADDR
 export LOCAL_IPSEC_ADDR6 REMOTE_IPSEC_ADDR6 LINUX_IPSEC_ADDR6
 export LINUX_VEB_ADDR LINUX_VEB_ADDR6
diff --git a/env-ot19.sh b/env-ot19.sh
index 5ce2b5b..77f635e 100644
--- a/env-ot19.sh
+++ b/env-ot19.sh
@@ -6,6 +6,8 @@ export SKIP_IF=em18
 export NETLINK_LINE=3
 # currently there is no distinct linux interface for link 4, share with 3
 export LINUX_IF=enp6s0
+export LINUX_LEFT_SSH=root@lt40
+export LINUX_RIGHT_SSH=root@lt43
 
 # allow to manually run perform tests frag and splice on netlink hosts
 
@@ -23,7 +25,4 @@ LOCAL_ADDR_RANGE=10.10.31.20
 LOCAL_ADDR6_RANGE=fdd7:e83e:66bd:1031::20
 LINUX_ADDR_RANGE=10.10.32.40
 LINUX_ADDR6_RANGE=fdd7:e83e:66bd:1032::40
-LINUX_SSH=root@lt40
-LINUX_OTHER_SSH=root@lt43
 export LOCAL_ADDR_RANGE LOCAL_ADDR6_RANGE LINUX_ADDR_RANGE LINUX_ADDR6_RANGE
-export LINUX_SSH LINUX_OTHER_SSH
diff --git a/env-ot25.sh b/env-ot25.sh
index d7b91df..1408984 100644
--- a/env-ot25.sh
+++ b/env-ot25.sh
@@ -9,6 +9,8 @@ export SKIP_IF=em0,em1,em4,em5,em8,em9,em10,em11,em12,ix0,ix1
 export NETLINK_LINE=4
 # currently there is no distinct linux interface for link 4, share with 3
 export LINUX_IF=enp6s0
+export LINUX_LEFT_SSH=root@lt40
+export LINUX_RIGHT_SSH=root@lt43
 
 # allow to manually run perform tests frag and splice on netlink hosts
 
@@ -41,7 +43,4 @@ LOCAL_ADDR_RANGE=10.10.41.20
 LOCAL_ADDR6_RANGE=fdd7:e83e:66bd:1041::20
 LINUX_ADDR_RANGE=10.10.42.40
 LINUX_ADDR6_RANGE=fdd7:e83e:66bd:1042::40
-LINUX_SSH=root@lt40
-LINUX_OTHER_SSH=root@lt43
 export LOCAL_ADDR_RANGE LOCAL_ADDR6_RANGE LINUX_ADDR_RANGE LINUX_ADDR6_RANGE
-export LINUX_SSH LINUX_OTHER_SSH
diff --git a/env-ot31.sh b/env-ot31.sh
index a243f2f..f486de9 100644
--- a/env-ot31.sh
+++ b/env-ot31.sh
@@ -19,13 +19,13 @@ LINUX_RELAY_ADDR=10.6.31.51
 LINUX_RELAY_ADDR6=fdd7:e83e:66bc:0631::51
 LINUX_LINUX_ADDR=10.3.36.36
 LINUX_LINUX_ADDR6=fdd7:e83e:66bc:336::36
-LINUX_SSH=perform@lt13
+LINUX_LEFT_SSH=perform@lt13
 
 LINUX_RELAY_LOCAL_ADDR=10.6.26.52
 LINUX_RELAY_LOCAL_ADDR6=fdd7:e83e:66bc:0626::52
 LINUX_RELAY_REMOTE_ADDR=10.6.16.51
 LINUX_RELAY_REMOTE_ADDR6=fdd7:e83e:66bc:0616::51
-LINUX_OTHER_SSH=perform@lt16
+LINUX_RIGHT_SSH=perform@lt16
 
 LOCAL_IPSEC_ADDR=10.7.31.51
 LOCAL_IPSEC_ADDR6=fdd7:e83e:66bc:0731::51
@@ -62,10 +62,10 @@ export REMOTE_IF REMOTE_MAC REMOTE_ADDR REMOTE_ADDR6
 export REMOTE_SSH
 export LINUX_ADDR LINUX_ADDR6 LINUX_FORWARD_ADDR LINUX_FORWARD_ADDR6
 export LINUX_RELAY_ADDR LINUX_RELAY_ADDR6 LINUX_LINUX_ADDR LINUX_LINUX_ADDR6
-export LINUX_SSH
+export LINUX_LEFT_SSH
 export LINUX_RELAY_LOCAL_ADDR LINUX_RELAY_LOCAL_ADDR6
 export LINUX_RELAY_REMOTE_ADDR LINUX_RELAY_REMOTE_ADDR6
-export LINUX_OTHER_SSH
+export LINUX_RIGHT_SSH
 export LOCAL_IPSEC_ADDR REMOTE_IPSEC_ADDR LINUX_IPSEC_ADDR
 export LOCAL_IPSEC_ADDR6 REMOTE_IPSEC_ADDR6 LINUX_IPSEC_ADDR6
 export LOCAL_IPSEC6_ADDR REMOTE_IPSEC6_ADDR LINUX_IPSEC6_ADDR
diff --git a/env-ot41.sh b/env-ot41.sh
index d69ee42..18f8d3a 100644
--- a/env-ot41.sh
+++ b/env-ot41.sh
@@ -3,6 +3,8 @@ export MANAGEMENT_IF=em4
 export SKIP_IF=em4,em2,em3
 export NETLINK_LINE=1
 export LINUX_IF=ens2f1
+export LINUX_LEFT_SSH=root@lt40
+export LINUX_RIGHT_SSH=root@lt43
 
 # allow to manually run perform tests frag and splice on netlink hosts
 
@@ -20,7 +22,4 @@ LOCAL_ADDR_RANGE=10.10.11.20
 LOCAL_ADDR6_RANGE=fdd7:e83e:66bd:1011::20
 LINUX_ADDR_RANGE=10.10.12.40
 LINUX_ADDR6_RANGE=fdd7:e83e:66bd:1012::40
-LINUX_SSH=root@lt40
-LINUX_OTHER_SSH=root@lt43
 export LOCAL_ADDR_RANGE LOCAL_ADDR6_RANGE LINUX_ADDR_RANGE LINUX_ADDR6_RANGE
-export LINUX_SSH LINUX_OTHER_SSH
diff --git a/env-ot42.sh b/env-ot42.sh
index 167a4a2..711d81f 100644
--- a/env-ot42.sh
+++ b/env-ot42.sh
@@ -3,6 +3,8 @@ export MANAGEMENT_IF=igc2
 export SKIP_IF=igc2,igc3
 export NETLINK_LINE=2
 export LINUX_IF=ens2f0
+export LINUX_LEFT_SSH=root@lt40
+export LINUX_RIGHT_SSH=root@lt43
 
 # allow to manually run perform tests frag and splice on netlink hosts
 
@@ -20,7 +22,4 @@ LOCAL_ADDR_RANGE=10.10.21.20
 LOCAL_ADDR6_RANGE=fdd7:e83e:66bd:1021::20
 LINUX_ADDR_RANGE=10.10.22.40
 LINUX_ADDR6_RANGE=fdd7:e83e:66bd:1022::40
-LINUX_SSH=root@lt40
-LINUX_OTHER_SSH=root@lt43
 export LOCAL_ADDR_RANGE LOCAL_ADDR6_RANGE LINUX_ADDR_RANGE LINUX_ADDR6_RANGE
-export LINUX_SSH LINUX_OTHER_SSH
diff --git a/netlink.pl b/netlink.pl
index 243d372..959cf16 100755
--- a/netlink.pl
+++ b/netlink.pl
@@ -60,6 +60,10 @@
     or die "MANAGEMENT_IF is not in env";
 my $linux_if = $ENV{LINUX_IF}
     or die "LINUX_IF is not in env";
+my $linux_left_ssh = $ENV{LINUX_LEFT_SSH}
+    or die "LINUX_LEFT_SSH is not in env";
+my $linux_right_ssh = $ENV{LINUX_RIGHT_SSH}
+    or die "LINUX_RIGHT_SSH is not in env";
 
 my ($iftype, $ifnum) = $iface =~ /^([a-z]+)([0-9]+)?$/;
 grep { $_ eq $iftype } @allifaces
@@ -154,7 +158,7 @@
 my $lnx_l_addr6 = "${ip6prefix}${line}1::1";
 my $lnx_l_net6 = "$lnx_l_addr6/64";
 my $lnx_l_net6_flat = "$lnx_l_addr6/60";
-my $lnx_l_ssh = 'root@lt40'; #$ENV{LINUXL_SSH}; # XXX
+my $lnx_l_ssh = $linux_left_ssh;
 
 my $lnx_l_tunnel_addr = "$ip4prefix.${line}3.1";
 my $lnx_l_tunnel_net = "$lnx_l_tunnel_addr/24";
@@ -166,7 +170,7 @@
 my $lnx_r_addr6 = "${ip6prefix}${line}2::4";
 my $lnx_r_net6 = "$lnx_r_addr6/64";
 my $lnx_r_net6_flat = "$lnx_r_addr6/60";
-my $lnx_r_ssh = 'root@lt43'; #$ENV{LINUXR_SSH};
+my $lnx_r_ssh = $linux_right_ssh;
 
 my @lnx_r_addr_range = map { "$lnx_r_addr$_" } 0..9;
 my @lnx_r_net_range = map { "$_/24" } @lnx_r_addr_range;
@@ -1113,13 +1117,13 @@ sub pingflood_finalize {
     }, {
 	statcmd => [ 'netstat', '-nr' ],
     }, {
-	statcmd => [ 'ssh', 'root@lt40', 'netstat', '-nr' ],
+	statcmd => [ 'ssh', $lnx_l_ssh, 'netstat', '-nr' ],
     }, {
-	statcmd => [ 'ssh', 'root@lt40', 'netstat', '-6nr' ],
+	statcmd => [ 'ssh', $lnx_l_ssh, 'netstat', '-6nr' ],
     }, {
-	statcmd => [ 'ssh', 'root@lt43', 'netstat', '-nr' ],
+	statcmd => [ 'ssh', $lnx_r_ssh, 'netstat', '-nr' ],
     }, {
-	statcmd => [ 'ssh', 'root@lt43', 'netstat', '-6nr' ],
+	statcmd => [ 'ssh', $lnx_r_ssh, 'netstat', '-6nr' ],
     }, {
 	statcmd => [ 'vmstat', '-mv' ],
     }, {
diff --git a/perform.pl b/perform.pl
index b6ab807..7791c4e 100755
--- a/perform.pl
+++ b/perform.pl
@@ -242,13 +242,13 @@ sub logcmd {
 my $linux_ipsec_addr6 = $ENV{LINUX_IPSEC_ADDR6};
 my $linux_ipsec6_addr = $ENV{LINUX_IPSEC6_ADDR};
 my $linux_ipsec6_addr6 = $ENV{LINUX_IPSEC6_ADDR6};
-my $linux_ssh = $ENV{LINUX_SSH};
+my $linux_left_ssh = $ENV{LINUX_LEFT_SSH};
 
 my $linux_relay_local_addr = $ENV{LINUX_RELAY_LOCAL_ADDR};
 my $linux_relay_local_addr6 = $ENV{LINUX_RELAY_LOCAL_ADDR6};
 my $linux_relay_remote_addr = $ENV{LINUX_RELAY_REMOTE_ADDR};
 my $linux_relay_remote_addr6 = $ENV{LINUX_RELAY_REMOTE_ADDR6};
-my $linux_other_ssh = $ENV{LINUX_OTHER_SSH};
+my $linux_right_ssh = $ENV{LINUX_RIGHT_SSH};
 
 my $linux_veb_addr = $ENV{LINUX_VEB_ADDR};
 my $linux_veb_addr6 = $ENV{LINUX_VEB_ADDR6};
@@ -282,14 +282,14 @@ sub logcmd {
 
 # I have seen hanging iperf3 processes on linux machines, reap them
 
-if ($linux_ssh) {
-    my @sshcmd = ('ssh', $linux_ssh, 'pkill', 'iperf3');
+if ($linux_left_ssh) {
+    my @sshcmd = ('ssh', $linux_left_ssh, 'pkill', 'iperf3');
     system(@sshcmd);
 }
-if ($linux_other_ssh) {
-    my @sshcmd = ('ssh', $linux_other_ssh, 'pkill', 'iperf3');
+if ($linux_right_ssh) {
+    my @sshcmd = ('ssh', $linux_right_ssh, 'pkill', 'iperf3');
     system(@sshcmd);
-    @sshcmd = ('ssh', $linux_other_ssh, 'iperf3', '-sD');
+    @sshcmd = ('ssh', $linux_right_ssh, 'iperf3', '-sD');
     system(@sshcmd)
 	and die "Start linux iperf3 server with '@sshcmd' failed: $?";
 }
@@ -816,7 +816,7 @@ sub fsmark_finalize {
 #    },
     {
 	# local recv, Linux send
-	client => $linux_ssh,
+	client => $linux_left_ssh,
 	server => undef,
 	address => $local_addr_range,
 	address6 => $local_addr6_range,
@@ -825,15 +825,15 @@ sub fsmark_finalize {
     {
 	# local send, other Linux recv
 	client => undef,
-	server => $linux_other_ssh,
+	server => $linux_right_ssh,
 	address => $linux_addr_range,
 	address6 => $linux_addr6_range,
 	parallel => 10,
     },
     {
 	# Linux send, local forward, other Linux recv
-	client => $linux_ssh,
-	server => $linux_other_ssh,
+	client => $linux_left_ssh,
+	server => $linux_right_ssh,
 	address => $linux_addr_range,
 	address6 => $linux_addr6_range,
 	parallel => 10,
@@ -888,8 +888,8 @@ sub fsmark_finalize {
 	    "-f$frame",
 	    '-i3',
 	    '-N10',
-	    "-c$linux_ssh",
-	    "-s$linux_other_ssh",
+	    "-c$linux_left_ssh",
+	    "-s$linux_right_ssh",
 	    "-A$local_addr_range",
 	    "-a$linux_addr_range",
 	    '-t10',
@@ -905,8 +905,8 @@ sub fsmark_finalize {
 	    "-f$frame",
 	    '-i3',
 	    '-N10',
-	    "-c$linux_ssh",
-	    "-s$linux_other_ssh",
+	    "-c$linux_left_ssh",
+	    "-s$linux_right_ssh",
 	    "-A$local_addr6_range",
 	    "-a$linux_addr6_range",
 	    '-t10',
@@ -920,8 +920,8 @@ sub fsmark_finalize {
 	    '-v',
 	    '-b1000000',
 	    '-N10',
-	    "-c$linux_ssh",
-	    "-s$linux_other_ssh",
+	    "-c$linux_left_ssh",
+	    "-s$linux_right_ssh",
 	    "-A$local_addr_range",
 	    "-a$linux_addr_range",
 	    '-t10',
@@ -933,8 +933,8 @@ sub fsmark_finalize {
 	    '-v',
 	    '-b1000000',
 	    '-N10',
-	    "-c$linux_ssh",
-	    "-s$linux_other_ssh",
+	    "-c$linux_left_ssh",
+	    "-s$linux_right_ssh",
 	    "-A$local_addr6_range",
 	    "-a$linux_addr6_range",
 	    '-t10',
@@ -945,114 +945,114 @@ sub fsmark_finalize {
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_forward_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_forward_addr",
 	    '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_forward_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_forward_addr",
 	    '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{forward4} && $linux_forward_addr && $linux_ssh;
+) if $testmode{forward4} && $linux_forward_addr && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_forward_addr6",
-	    '-P10', '-t10'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_forward_addr6", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_forward_addr6",
-	    '-P10', '-t10', '-R'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_forward_addr6", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{forward6} && $linux_forward_addr6 && $linux_ssh;
+) if $testmode{forward6} && $linux_forward_addr6 && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_relay_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_relay_addr",
 	    '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_relay_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_relay_addr",
 	    '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay4} && $linux_relay_addr && $linux_ssh;
+) if $testmode{relay4} && $linux_relay_addr && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_relay_addr6",
-	    '-P10', '-t10'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_relay_addr6", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_relay_addr6",
-	    '-P10', '-t10', '-R'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_relay_addr6", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay6} && $linux_relay_addr6 && $linux_ssh;
+) if $testmode{relay6} && $linux_relay_addr6 && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3',
 	    "-c$linux_relay_local_addr", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3',
 	    "-c$linux_relay_local_addr", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay4} && $linux_relay_local_addr && $linux_other_ssh;
+) if $testmode{relay4} && $linux_relay_local_addr && $linux_right_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3', '-6',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3', '-6',
 	    "-c$linux_relay_local_addr6", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3', '-6',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3', '-6',
 	    "-c$linux_relay_local_addr6", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay6} && $linux_relay_local_addr6 && $linux_other_ssh;
+) if $testmode{relay6} && $linux_relay_local_addr6 && $linux_right_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3',
 	    "-c$linux_relay_remote_addr", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3',
 	    "-c$linux_relay_remote_addr", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay4} && $linux_relay_remote_addr && $linux_other_ssh;
+) if $testmode{relay4} && $linux_relay_remote_addr && $linux_right_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3', '-6',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3', '-6',
 	    "-c$linux_relay_remote_addr6", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_other_ssh, 'iperf3', '-6',
+	testcmd => ['ssh', $linux_right_ssh, 'iperf3', '-6',
 	    "-c$linux_relay_remote_addr6", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{relay6} && $linux_relay_remote_addr6 && $linux_other_ssh;
+) if $testmode{relay6} && $linux_relay_remote_addr6 && $linux_right_ssh;
 my %ipsec = (
     ipsec4  => { ip => 4, addr => $remote_ipsec_trans_addr },
     ipsec6  => { ip => 6, addr => $remote_ipsec_trans_addr6 },
-    ipsec44 => { ip => 4, addr => $linux_ipsec_addr,   ssh => $linux_ssh },
-    ipsec46 => { ip => 6, addr => $linux_ipsec_addr6,  ssh => $linux_ssh },
-    ipsec64 => { ip => 4, addr => $linux_ipsec6_addr,  ssh => $linux_ssh },
-    ipsec66 => { ip => 6, addr => $linux_ipsec6_addr6, ssh => $linux_ssh },
+    ipsec44 => { ip => 4, addr => $linux_ipsec_addr,   ssh => $linux_left_ssh },
+    ipsec46 => { ip => 6, addr => $linux_ipsec_addr6,  ssh => $linux_left_ssh },
+    ipsec64 => { ip => 4, addr => $linux_ipsec6_addr,  ssh => $linux_left_ssh },
+    ipsec66 => { ip => 6, addr => $linux_ipsec6_addr6, ssh => $linux_left_ssh },
 );
 my @ipsectests;
 foreach my $ipsecmode (sort keys %ipsec) {
@@ -1087,29 +1087,29 @@ sub fsmark_finalize {
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_veb_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_veb_addr",
 	    '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', "-c$linux_veb_addr",
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', "-c$linux_veb_addr",
 	    '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{vbridge4} && $linux_veb_addr && $linux_ssh;
+) if $testmode{vbridge4} && $linux_veb_addr && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_veb_addr6",
-	    '-P10', '-t10'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_veb_addr6", '-P10', '-t10'],
 	parser => \&iperf3_parser,
     }, {
 	initialize => \&iperf3_initialize,
-	testcmd => ['ssh', $linux_ssh, 'iperf3', '-6', "-c$linux_veb_addr6",
-	    '-P10', '-t10', '-R'],
+	testcmd => ['ssh', $linux_left_ssh, 'iperf3', '-6',
+	    "-c$linux_veb_addr6", '-P10', '-t10', '-R'],
 	parser => \&iperf3_parser,
     }
-) if $testmode{vbridge6} && $linux_veb_addr6 && $linux_ssh;
+) if $testmode{vbridge6} && $linux_veb_addr6 && $linux_left_ssh;
 push @tests, (
     {
 	initialize => \&iperf3_initialize,