Redes de computadores - Universitat Oberta de Catalunya

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Redes de computadoresª FUOC • XP04/90786/00020AnexosAnexo 1El algoritmo checksumLos protocolos IP y TCP utilizan, entre otros, un sencillo checksum parala detección de errores. Ésta es una versión del algoritmo checksum:u_short checksum(u_short * addr,int len){int aux_len = len;u_short *aux_addr = addr;u_short res;int sum = 0;while(aux_len > 1){sum+ = *aux_addr++;aux_len- = 2;}if(aux_len == 1)sum+ = *(u_char) *aux_addr;}sum = (sum>>16) + (sum & 0xffff);sum+ = (sum>>16);res = ~sum;return res;ANOTACIONES331
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Software libreJosé María Barceló
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Redes de computadoresª FUOC • XP
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I. Introducción a las redesde comp
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ª FUOC • XP04/90786/00020Softwar
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IV. Aplicaciones Internet
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Redes de computadores - Universitat Oberta de Catalunya

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