using odd veths for packet injection and sniffing in examples

examples/copy_to_cpu/README.md

@@ -24,9 +24,9 @@ We provide a small demo to let you test the program. It consists of the
 following scripts:
 - [run_switch.sh] (run_switch.sh): compile the P4 program and starts the switch,
   also configures the data plane by running the CLI [commands] (commands.txt)
-- [receive.py] (receive.py): sniff packets on port 3 (veth6) and print a hexdump
+- [receive.py] (receive.py): sniff packets on port 3 (veth7) and print a hexdump
   of them
-- [send_one.py] (send_one.py): send one simple IPv4 packet on port 0 (veth0)
+- [send_one.py] (send_one.py): send one simple IPv4 packet on port 0 (veth1)
 
 If you take a look at [commands.txt] (commands.txt), you'll notice the following
 command: `mirroring_add 250 3`. This means that all the cloned packets with

examples/copy_to_cpu/receive.py

@@ -1,3 +1,3 @@
 from scapy.all import *
 
-sniff(iface = "veth6", prn = lambda x: hexdump(x))
+sniff(iface = "veth7", prn = lambda x: hexdump(x))

examples/copy_to_cpu/send_one.py

@@ -3,4 +3,4 @@ from scapy.all import *
 p = Ether(dst="aa:bb:cc:dd:ee:ff") / IP(dst="10.0.1.10") / TCP() / "aaaaaaaaaaaaaaaaaaa"
 # p.show()
 hexdump(p)
-sendp(p, iface = "veth0")
+sendp(p, iface = "veth1")