destination
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... validation of the document/datagram and then processing the
destination address, TTL, and checksum before sending it on to its
...
... <source address="10.0.0.22"/>
<destination address="10.0.0.1"/>
<options>
<end copied="0" class ...
... tos, total.length, id, flags, offset, ttl,
protocol, checksum, source, destination, options,
padding)>
<!-- length of header ...
... -->
<!ELEMENT tcp.pseudoheader (source, destination, protocol,
tcp.length)>
...
...
<!ELEMENT udp.pseudoheader (source, destination, protocol,
udp.length)>
...