igrp.h

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Cisco IGRP definitions
 */

/* IGRP Header
 */
struct igrphdr {
       u_int   ig_op:4;      /* opcode */
       u_int   ig_v :4;      /* protocol version number */
       u_char  ig_ed;        /* edition number */
       u_short ig_as;        /* autonomous system number */
       u_short ig_ni;        /* number of subnet in local net */
       u_short ig_ns;        /* number of networks in AS */
       u_short ig_nx;        /* number of networks ouside AS */
       u_short ig_sum;       /* checksum of IGRP header & data */
     };

#define IGRP_UPDATE   1
#define IGRP_REQUEST  2

/* IGRP routing entry
 */
struct igrprte {
       u_char igr_net[3];    /* 3 significant octets of IP address */
       u_char igr_dly[3];    /* delay in tens of microseconds */
       u_char igr_bw[3];     /* bandwidth in units of 1 kb/s */
       u_char igr_mtu[2];    /* MTU in octets */
       u_char igr_rel;       /* percent packets successfully tx/rx */
       u_char igr_ld;        /* percent of channel occupied */
       u_char igr_hct;       /* hop count */
     };

#define IGRP_RTE_SIZE 14     /* don't believe sizeof ! */