[Durbek Gafurov]

For some reason, now we have to manually turn up the interface.
You can first install
sudo apt install -y net-tools

and

sudo ifconfig ens7 up && sudo ifconfig ens8 up && sudo ifconfig ens9 up && sudo ifconfig ens10 up

Alternatively you can use the code below, to turn on all interfaces
try:
for node in slice.get_nodes():
print(“—-“)
print(“Node:”)
print(f” Name : {node.get_name()}”)
for component in node.get_components():
print(f” Name : {component.get_name()}”)
for interface in node.get_interfaces():
print(f” Name : {interface.get_name()}”)
stdout, stderr = node.execute(f’sudo apt install -y net-tools && sudo ifconfig {interface.get_os_interface()} up ‘)
except Exception as e:
print(f”Fail: {e}”)
traceback.print_exc()

[Durbek Gafurov]

When the checksum is correct I receive it in receiving node.

[Durbek Gafurov]

Short answer yes, I am intentionally sending bad packets.

Longer version: I am working with P4 lang, I am changing ipv4 headers with p4lang, p4lang at this point unable to generate correct checksum, because in the header i have array and as far as I know p4lang cannot loop. Hence the generated checksum is wrong.

[Durbek Gafurov]

Thanks for reply and suggestion. I tried to use NIC5 and NIC6 the same issue. When the packet has good checksum it accepts and packets with bad checksum are lost. I can see those packets leaving interface from sending node, but don’t see them at the receiving node.

Any suggestion is appreciated.

[Durbek Gafurov]

One of the reasons that was contributing to the error  is that old variables were used in docker command:

 

#port1_iface=$1
#port2_iface=$2
#port3_iface=$3
#ip_type=$4

……
docker exec -d -it fabric_p4 sh -c ‘simple_switch –interface 1@’${port1_iface}’ –interface 2@’${port2_iface}’ –interface 3@’${port3_iface}’ /root/tutorials/exercises/basic_tunnel/basic_tunnel.json’

I have created a pull request pr that should fix  this issue.

[Author]

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