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Redes de Computadoras

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La pseudo-cabecera no se transmite. Se utiliza en el checksum para<br />

verificar, entre otras cosas, que el datagrama UDP llega al <strong>de</strong>stino<br />

correcto y que el host origen es el que indica el IP. Su contenido es:<br />

<strong>Re<strong>de</strong>s</strong> <strong>de</strong> <strong>Computadoras</strong>, 2007/08<br />

0 7 8 16 31<br />

+---------------------------------------------------+<br />

| SrcIPAddr |<br />

+-------------------------+-------------------------+<br />

| DstIPAddr |<br />

+------------+------------+-------------------------+<br />

| ZERO | PROTO | Length |<br />

+------------+------------+-------------------------+<br />

SrcIPAddr = dirección IP <strong>de</strong>l host emisor (proporcionada por el IP).<br />

DstIPAddr = dir. IP <strong>de</strong>l host receptor (prop. por la aplicación).<br />

ZERO = byte <strong>de</strong> relleno igual a 0.<br />

PROTO = i<strong>de</strong>ntificador <strong>de</strong> protocolo (17 para UDP).<br />

Length = tamaño <strong>de</strong>l datagrama UDP.<br />

12.3 La suma <strong>de</strong> comprobación (checksum) 221

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