CSIT-124: IPv4 encapsulations - IP4-GRE-IP4

- add gre test with multiple tunnel configured
- configure tunnel source as a loopback
- route from tunnel to tunnel
- check droping unknown tunnel destination

Change-Id: Ib522d158d9de5c66f556c6734ceadc994eea02d4
Signed-off-by: Matej Klotton <mklotton@cisco.com>

1 files changed, 219 insertions, 59 deletions

diff --git a/tests/func/gre/gre_encapsulation.robot b/tests/func/gre/gre_encapsulation.robot
index 17b3fffff2..0296ec3af2 100644
--- a/tests/func/gre/gre_encapsulation.robot
+++ b/tests/func/gre/gre_encapsulation.robot
@@ -20,10 +20,12 @@
 | Library  | resources.libraries.python.IPUtil
 | Library  | resources.libraries.python.Trace
 | Force Tags | VM_ENV | HW_ENV
-| Test Setup | Run Keywords | Setup all DUTs before test
-| ...        | AND          | Setup all TGs before traffic script
-| Test Teardown | Run Keywords | Show Packet Trace on All DUTs | ${nodes}
-| ...           | AND          | Show vpp trace dump on all DUTs
+| Test Setup | Run Keywords
+| ... | Setup all DUTs before test | AND
+| ... | Setup all TGs before traffic script
+| Test Teardown | Run Keywords
+| ... | Show Packet Trace on All DUTs | ${nodes} | AND
+| ... | Show vpp trace dump on all DUTs
 | Documentation | *GREoIPv4 test cases*
 | ...
 | ... | *[Top] Network Topologies:* TG=DUT1 2-node topology with two links
@@ -48,11 +50,20 @@
 | ${net1_gw_address}= | 192.168.0.1
 | ${net2_address}= | 192.168.2.0
 | ${net2_host_address}= | 192.168.2.100
+| ${net3_address}= | 192.168.3.0
+| ${net3_host_address}= | 192.168.3.100
 | ${net2_gw_address}= | 192.168.2.1
 | ${dut1_ip_address}= | 192.168.1.1
 | ${dut2_ip_address}= | 192.168.1.2
 | ${dut1_gre_ip}= | 172.16.0.1
 | ${dut2_gre_ip}= | 172.16.0.2
+| ${dut_tun0_ip1}= | 172.16.0.1
+| ${dut_tun0_ip2}= | 172.16.0.2
+| ${dut_tun1_ip1}= | 172.16.1.1
+| ${dut_tun1_ip2}= | 172.16.1.2
+| ${dut1_lo_address}= | 10.0.0.1
+| ${tun0_dst}= | 10.0.0.2
+| ${tun1_dst}= | 10.0.0.3
 | ${prefix}= | 24
 
 *** Test Cases ***
@@ -66,32 +77,32 @@
 | | ... | received packets are correct. [Ref] RFC2784.
 | | [Tags] | 3_NODE_SINGLE_LINK_TOPO | 3_NODE_DOUBLE_LINK_TOPO
 | | Given Path for 3-node testing is set | ${nodes['TG']} | ${nodes['DUT1']}
-| |       ... | ${nodes['DUT2']} | ${nodes['TG']}
-| | And   Interfaces in 3-node path are up
-| | And   IP addresses are set on interfaces
-| |       ... | ${dut1_node} | ${dut1_to_dut2} | ${dut1_ip_address} | ${prefix}
-| |       ... | ${dut1_node} | ${dut1_to_tg}   | ${net1_gw_address} | ${prefix}
-| |       ... | ${dut2_node} | ${dut2_to_dut1} | ${dut2_ip_address} | ${prefix}
-| |       ... | ${dut2_node} | ${dut2_to_tg}   | ${net2_gw_address} | ${prefix}
-| | And   VPP IP Probe | ${dut1_node} | ${dut1_to_dut2} | ${dut2_ip_address}
-| | And   VPP IP Probe | ${dut2_node} | ${dut2_to_dut1} | ${dut1_ip_address}
-| | And   Add Arp On Dut | ${dut2_node} | ${dut2_to_tg} | ${net2_host_address}
-| |       ... | ${tg_to_dut2_mac}
+| | ... | ${nodes['DUT2']} | ${nodes['TG']}
+| | And Interfaces in 3-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut1_node} | ${dut1_to_dut2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut1_node} | ${dut1_to_tg}   | ${net1_gw_address} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_to_dut1} | ${dut2_ip_address} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_to_tg}   | ${net2_gw_address} | ${prefix}
+| | And VPP IP Probe | ${dut1_node} | ${dut1_to_dut2} | ${dut2_ip_address}
+| | And VPP IP Probe | ${dut2_node} | ${dut2_to_dut1} | ${dut1_ip_address}
+| | And Add Arp On Dut | ${dut2_node} | ${dut2_to_tg} | ${net2_host_address}
+| | ... | ${tg_to_dut2_mac}
 | | ${dut1_gre_interface} | ${dut1_gre_index}=
-| | | ... | When GRE tunnel interface is created and up
-| | |     |      ... | ${dut1_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut1_node} | ${dut1_ip_address} | ${dut2_ip_address}
 | | ${dut2_gre_interface} | ${dut2_gre_index}=
-| | | ... | And  GRE tunnel interface is created and up
-| | |     |      ... | ${dut2_node} | ${dut2_ip_address} | ${dut1_ip_address}
-| | And  IP addresses are set on interfaces
-| |      ... | ${dut1_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
-| |      ... | ${dut2_node} | ${dut2_gre_index} | ${dut2_gre_ip} | ${prefix}
-| | And  Vpp Route Add | ${dut1_node} | ${net2_address} | ${prefix}
-| |      ... | ${dut2_gre_ip} | ${dut1_gre_index}
+| | ... | And  GRE tunnel interface is created and up
+| | ... | ${dut2_node} | ${dut2_ip_address} | ${dut1_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut1_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | ... | ${dut2_node} | ${dut2_gre_index} | ${dut2_gre_ip} | ${prefix}
+| | And Vpp Route Add | ${dut1_node} | ${net2_address} | ${prefix}
+| | ... | ${dut2_gre_ip} | ${dut1_gre_index}
 | | Then Send Packet And Check Headers | ${tg_node}
-| |      ... | ${net1_host_address} | ${net2_host_address}
-| |      ... | ${tg_to_dut1} | ${tg_to_dut1_mac} | ${dut1_to_tg_mac}
-| |      ... | ${tg_to_dut2} | ${dut2_to_tg_mac} | ${tg_to_dut2_mac}
+| | ... | ${net1_host_address} | ${net2_host_address}
+| | ... | ${tg_to_dut1} | ${tg_to_dut1_mac} | ${dut1_to_tg_mac}
+| | ... | ${tg_to_dut2} | ${dut2_to_tg_mac} | ${tg_to_dut2_mac}
 
 | TC02: DUT encapsulates IPv4 into GREoIPv4 tunnel - GRE header verification
 | | [Documentation]
@@ -102,25 +113,25 @@
 | | ... | GREoIPv4 encapsulated packet is correct. [Ref] RFC2784.
 | | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
 | | Given Path for 2-node testing is set
-| |       ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
-| | And   Interfaces in 2-node path are up
-| | And   IP addresses are set on interfaces
-| |       ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
-| |       ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
-| | And  Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
-| |      ... | ${tg_to_dut_if2_mac}
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
+| | ... | ${tg_to_dut_if2_mac}
 | | ${dut1_gre_interface} | ${dut1_gre_index}=
-| | | ... | When GRE tunnel interface is created and up
-| | |     |      ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
-| | And  IP addresses are set on interfaces
-| |      ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
-| | And  Vpp Route Add | ${dut_node} | ${net2_address} | ${prefix}
-| |      ... | ${dut2_gre_ip} | ${dut1_gre_index}
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | And Vpp Route Add | ${dut_node} | ${net2_address} | ${prefix}
+| | ... | ${dut2_gre_ip} | ${dut1_gre_index}
 | | Then Send ICMPv4 and check received GRE header
-| |      ... | ${tg_node} | ${tg_to_dut_if1} | ${tg_to_dut_if2}
-| |      ... | ${dut_to_tg_if1_mac} | ${tg_to_dut_if2_mac}
-| |      ... | ${net1_host_address} | ${net2_host_address}
-| |      ... | ${dut1_ip_address} | ${dut2_ip_address}
+| | ... | ${tg_node} | ${tg_to_dut_if1} | ${tg_to_dut_if2}
+| | ... | ${dut_to_tg_if1_mac} | ${tg_to_dut_if2_mac}
+| | ... | ${net1_host_address} | ${net2_host_address}
+| | ... | ${dut1_ip_address} | ${dut2_ip_address}
 
 | TC03: DUT decapsulates IPv4 from GREoIPv4 tunnel - IPv4 header verification
 | | [Documentation]
@@ -131,20 +142,169 @@
 | | ... | de-encapsulated packet is correct. [Ref] RFC2784.
 | | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
 | | Given Path for 2-node testing is set
-| |       ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
-| | And   Interfaces in 2-node path are up
-| | And   IP addresses are set on interfaces
-| |       ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
-| |       ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
-| | And  Add Arp On Dut | ${dut_node} | ${dut_to_tg_if1} | ${net1_host_address}
-| |      ... | ${tg_to_dut_if1_mac}
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if1} | ${net1_host_address}
+| | ... | ${tg_to_dut_if1_mac}
 | | ${dut1_gre_interface} | ${dut1_gre_index}=
-| | | ... | When GRE tunnel interface is created and up
-| | |     |      ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
-| | And  IP addresses are set on interfaces
-| |      ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_ip_address} | ${dut2_ip_address}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre_index} | ${dut1_gre_ip} | ${prefix}
 | | Then Send GRE and check received ICMPv4 header
-| |      ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if1}
-| |      ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if1_mac}
-| |      ... | ${net2_host_address} | ${net1_host_address}
-| |      ... | ${dut2_ip_address} | ${dut1_ip_address}
+| | ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if1}
+| | ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if1_mac}
+| | ... | ${net2_host_address} | ${net1_host_address}
+| | ... | ${dut2_ip_address} | ${dut1_ip_address}
+
+| TC04: DUT encapsulates IPv4 into GREoIPv4 different tunnels - GRE header verification
+| | [Documentation]
+| | ... | [Top] TG=DUT1. [Enc] Eth-IPv4-ICMPv4 on TG_if1-DUT, \
+| | ... | Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT. [Cfg] On DUT1 configure two
+| | ... | GRE tunnels with loopback's source address. Destination address of
+| | ... | tunnels are routed via next hop address of DUT's to TG if2, where
+| | ... | should be only GRE encapsulated packets. Each tunnel has IPv4 address
+| | ... | and configured prefix routed through the tunnel. [Ver] Make TG send
+| | ... | non-encapsulated ICMPv4 Echo Req to DUT; verify TG received GREoIPv4
+| | ... | encapsulated packet is correct for each tunnel. [Ref] RFC2784.
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | Given Path for 2-node testing is set
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | ${dut1_lo_index}= | And VPP Create loopback | ${dut_node}
+| | And Set Interface State |  ${dut_node} | ${dut1_lo_index} | up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | ... | ${dut_node} | ${dut1_lo_index} | ${dut1_lo_address} | ${32}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
+| | ... | ${tg_to_dut_if2_mac}
+| | And Vpp Route Add | ${dut_node} | ${tun0_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | And Vpp Route Add | ${dut_node} | ${tun1_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | ${dut1_gre0_interface} | ${dut1_gre0_index}=
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun0_dst}
+| | ${dut1_gre1_interface} | ${dut1_gre1_index}=
+| | ... | And GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun1_dst}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre0_index} | ${dut_tun0_ip1} | ${prefix}
+| | ... | ${dut_node} | ${dut1_gre1_index} | ${dut_tun1_ip1} | ${prefix}
+| | And Vpp Route Add | ${dut_node} | ${net2_address} | ${prefix}
+| |  ... | ${dut_tun0_ip2} | ${dut1_gre0_index}
+| | And Vpp Route Add | ${dut_node} | ${net3_address} | ${prefix}
+| | ... | ${dut_tun1_ip2} | ${dut1_gre1_index}
+| | Then Send ICMPv4 and check received GRE header
+| | ... | ${tg_node} | ${tg_to_dut_if1} | ${tg_to_dut_if2}
+| | ... | ${dut_to_tg_if1_mac} | ${tg_to_dut_if2_mac}
+| | ... | ${net1_host_address} | ${net2_host_address}
+| | ... | ${dut1_lo_address} | ${tun0_dst}
+| | And Send ICMPv4 and check received GRE header
+| | ... | ${tg_node} | ${tg_to_dut_if1} | ${tg_to_dut_if2}
+| | ... | ${dut_to_tg_if1_mac} | ${tg_to_dut_if2_mac}
+| | ... | ${net1_host_address} | ${net3_host_address}
+| | ... | ${dut1_lo_address} | ${tun1_dst}
+
+| TC05: DUT re-encapsulates IPv4 GRE into other GRE tunnel - GRE header verification
+| | [Documentation]
+| | ... | [Top] TG=DUT1. [Enc] Eth-IPv4-ICMPv4 on TG_if1-DUT, \
+| | ... | Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT. [Cfg] On DUT1 configure two
+| | ... | GRE tunnels with loopback's source address. Destination address of
+| | ... | tunnels are routed via next hop address of DUT's to TG if2, where
+| | ... | should be only GRE encapsulated packets. Each tunnel has IPv4 address
+| | ... | and configured prefix routed through the tunnel. [Ver] Make TG send
+| | ... | encapsulated IPv4 UDP to DUT; Encapsulated IP source is behind
+| | ... | configured tunnel same as destination; verify TG received GREoIPv4
+| | ... | encapsulated packet is correct. [Ref] RFC2784.
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | Given Path for 2-node testing is set
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | ${dut1_lo_index}= | And VPP Create loopback | ${dut_node}
+| | And Set Interface State |  ${dut_node} | ${dut1_lo_index} | up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | ... | ${dut_node} | ${dut1_lo_index} | ${dut1_lo_address} | ${32}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
+| | ... | ${tg_to_dut_if2_mac}
+| | And Vpp Route Add | ${dut_node} | ${tun0_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | And Vpp Route Add | ${dut_node} | ${tun1_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | ${dut1_gre0_interface} | ${dut1_gre0_index}=
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun0_dst}
+| | ${dut1_gre1_interface} | ${dut1_gre1_index}=
+| | ... | And GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun1_dst}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre0_index} | ${dut_tun0_ip1} | ${prefix}
+| | ... | ${dut_node} | ${dut1_gre1_index} | ${dut_tun1_ip1} | ${prefix}
+| | And Vpp Route Add | ${dut_node} | ${net2_address} | ${prefix}
+| |  ... | ${dut_tun0_ip2} | ${dut1_gre0_index}
+| | And Vpp Route Add | ${dut_node} | ${net3_address} | ${prefix}
+| | ... | ${dut_tun1_ip2} | ${dut1_gre1_index}
+| | Then Send GRE and check received GRE header
+| | ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if2}
+| | ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if2_mac}
+| | ... | ${dut1_lo_address} | ${tun0_dst}
+| | ... | ${net3_host_address} | ${net2_host_address}
+| | ... | ${tg_to_dut_if2_mac} | ${dut_to_tg_if2_mac}
+| | ... | ${tun1_dst} | ${dut1_lo_address}
+
+| TC06: DUT do not process GRE with wrong tunnel destination IP
+| | [Documentation]
+| | ... | [Top] TG=DUT1. [Enc] Eth-IPv4-ICMPv4 on TG_if1-DUT, \
+| | ... | Eth-IPv4-GRE-IPv4-ICMPv4 on TG_if2_DUT. [Cfg] On DUT1 configure two
+| | ... | GRE tunnels with loopback's source address. Destination address of
+| | ... | tunnels are routed via next hop address of DUT's to TG if2, where
+| | ... | should be only GRE encapsulated packets. On DUT's to TG if1 interface
+| | ... | is configured test destination host MAC address. [Ver] Make TG send
+| | ... | GRE encapsulated ICMPv4 Echo Req to DUT; verify TG received
+| | ... | de-capsulated packet is correct, then send packet with wrong tunnel
+| | ... | destination address. [Ref] RFC2784.
+| | ... |
+| | [Tags] | 3_NODE_DOUBLE_LINK_TOPO
+| | Given Path for 2-node testing is set
+| | ... | ${nodes['TG']} | ${nodes['DUT1']} | ${nodes['TG']}
+| | And Interfaces in 2-node path are up
+| | ${dut1_lo_index}= | And VPP Create loopback | ${dut_node}
+| | And Set Interface State |  ${dut_node} | ${dut1_lo_index} | up
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut_to_tg_if2} | ${dut1_ip_address} | ${prefix}
+| | ... | ${dut_node} | ${dut_to_tg_if1} | ${net1_gw_address} | ${prefix}
+| | ... | ${dut_node} | ${dut1_lo_index} | ${dut1_lo_address} | ${32}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if1} | ${net1_host_address}
+| | ... | ${tg_to_dut_if1_mac}
+| | And Add Arp On Dut | ${dut_node} | ${dut_to_tg_if2} | ${dut2_ip_address}
+| | ... | ${tg_to_dut_if2_mac}
+| | And Vpp Route Add | ${dut_node} | ${tun0_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | And Vpp Route Add | ${dut_node} | ${tun1_dst} | ${32}
+| | ... | ${dut2_ip_address} | ${dut_to_tg_if2}
+| | ${dut1_gre0_interface} | ${dut1_gre0_index}=
+| | ... | When GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun0_dst}
+| | ${dut1_gre1_interface} | ${dut1_gre1_index}=
+| | ... | And GRE tunnel interface is created and up
+| | ... | ${dut_node} | ${dut1_lo_address} | ${tun1_dst}
+| | And IP addresses are set on interfaces
+| | ... | ${dut_node} | ${dut1_gre0_index} | ${dut_tun0_ip1} | ${prefix}
+| | ... | ${dut_node} | ${dut1_gre1_index} | ${dut_tun1_ip1} | ${prefix}
+| | Then Send GRE and check received ICMPv4 header
+| | ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if1}
+| | ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if1_mac}
+| | ... | ${net2_host_address} | ${net1_host_address}
+| | ... | ${tun0_dst} | ${dut1_lo_address}
+| | And Run Keyword And Expect Error | ICMP echo Rx timeout
+| | ... | Send GRE and check received ICMPv4 header |
+| | ... | ${tg_node} | ${tg_to_dut_if2} | ${tg_to_dut_if1}
+| | ... | ${dut_to_tg_if2_mac} | ${tg_to_dut_if1_mac}
+| | ... | ${net2_host_address} | ${net1_host_address}
+| | ... | ${tun0_dst} | ${dut1_ip_address}