Avoid using %eth0 in the IPv6 address.

Scapy lacks support for interface scoping such as fe80: :1%eth0. Instead, remove %eth0 and define the interface individually

Utilize sendp() in place of send()

For link-local addresses, use sendp() (Layer 2) because routing can’t be resolved at Layer 3 without scoping.

from scapy.all import *

localPort = 24

port = 300

size = 30

# Link-local IPv6 addresses (without %eth0)

localIpv6 = "fe80::1ab:2c3d:4e5f:6789"

dstIpv6 = "fe80::abcd:1234:5678:9abc"

ip = IPv6(src=localIpv6, dst=dstIpv6)

tcp = TCP(sport=localPort, dport=port, flags="S")

raw = Raw(b"x" * size)

packet = ip / tcp / raw

# Use Ether() + sendp for link-local

sendp(Ether() / packet, iface="eth0", verbose=True)

use this

Execute the script using sudo.

Make sure Wireshark is recording on eth0.

Apply the display filter: ipv6 && tcp

For global IPv6 (2001::/), send() functions if a default route is present.