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Added comments on some ARP options.

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likewise 2003-03-11 13:57:25 +00:00
parent daeb21b3b9
commit 400ff200ee
1 changed files with 19 additions and 12 deletions
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31
src/include/lwip/opt.h
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@ -33,10 +33,10 @@
#define __LWIP_OPT_H__
#include "lwip/debug.h"
/* Include user options which override defaults */
/* Include user defined options first */
#include "lwipopts.h"
/* Define default values for all configuration parameters. */
/* Define default values for unconfigured parameters. */
/* Platform specific locking */
@ -146,27 +146,29 @@ a lot of data that needs to be copied, this should be set high. */
/* ---------- ARP options ---------- */
/** Number of active hardware address, IP address pairs cached */
#ifndef ARP_TABLE_SIZE
#define ARP_TABLE_SIZE 10
#endif
/**
* If enabled, outgoing packets are queued during hardware address
* resolution. The etharp.c implementation queues 1 packet only.
*/
#ifndef ARP_QUEUEING
#define ARP_QUEUEING 1
#endif
/**
* - If enabled, cache entries are generated for every kind of ARP traffic or
* broadcast IP traffic. This enhances behaviour for sending to a dynamic set
* of hosts, for example if acting as a gateway.
* - If disabled, cache entries are generated only for IP destination addresses
* in use by lwIP or applications. This enhances performance if sending to a small,
* reasonably static number of hosts. Typically for embedded devices.
* If defined to 1, cache entries are updated or added for every kind of ARP traffic
* or broadcast IP traffic. Recommended for routers.
* If defined to 0, only existing cache entries are updated. Entries are added when
* lwIP is sending to them. Recommended for embedded devices.
*/
#ifndef ETHARP_ALWAYS_INSERT
#define ETHARP_ALWAYS_INSERT 1
#endif
/* ---------- IP options ---------- */
/* Define IP_FORWARD to 1 if you wish to have the ability to forward
IP packets across network interfaces. If you are going to run lwIP
@ -181,12 +183,17 @@ a lot of data that needs to be copied, this should be set high. */
#define IP_OPTIONS 1
#endif
/* IP reassembly and segmentation.These are orthogonal even
* if they both deal with IP fragments */
/** IP reassembly and segmentation. Even if they both deal with IP
* fragments, note that these are orthogonal, one dealing with incoming
* packets, the other with outgoing packets
*/
/** Reassemble incoming fragmented IP packets */
#ifndef IP_REASSEMBLY
#define IP_REASSEMBLY 1
#endif
/** Fragment outgoing IP packets if their size exceeds MTU */
#ifndef IP_FRAG
#define IP_FRAG 1
#endif