In Scapy, we can use ls$($IP$)$ to list all the fields of the IP class. See the following. When we spoof an IP packet, we simply use ip $=$ IP$()$ without setting any argument, what will be the values of the ttl and src IP fields of the packet? How about if we do set the dst field: ip $=$ IP$($dst$="1\mathrm{.}1\mathrm{.}1\mathrm{.}1")?$