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rip.d

# struct netinfo {
#     struct      sockaddr rip_dst; /* destination net/host */
#     int   rip_metric;       /* cost of route */
# };
# struct rip {
#     u_char      rip_cmd;          /* request/response */
#     u_char      rip_vers;         /* protocol version # */
#     u_char      rip_res1[2];            /* pad to 32-bit boundary */
#     union {
#           struct      netinfo ru_nets[1];     /* variable length... */
#           char  ru_tracefile[1];  /* ditto ... */
#     } ripun;
#define     rip_nets    ripun.ru_nets
#define     rip_tracefile     ripun.ru_tracefile
#define     RIPCMD_REQUEST          1     /* want info */
#define     RIPCMD_RESPONSE         2     /* responding to request */
#define     RIPCMD_TRACEON          3     /* turn tracing on */
#define     RIPCMD_TRACEOFF         4     /* turn it off */
#define     HOPCNT_INFINITY         16    /* per Xerox NS */
#define     MAXPACKETSIZE           512   /* max broadcast size */

### RIP packet redux
### UDP send FROM clued-rtr/520 to target/520
2     # RIPCMD_RESPONSE
1     # version
0     # padding
0

# sockaddr-plus-metric  structs begin, as many as necessary...
0     # len
2     # AF_INET
0     # port
0
# addr bytes:
X
Y
Z
Q
0     # filler, out to 16 bytes [sizeof (sockaddr)] ...
0
0
0
0
0
0
0
0     # metric: net-order integer
0
0
1

## that's it

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