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Outgoing packets caused ARP requests even when the destination IP was already cached.

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likewise 2004-07-20 23:18:09 +00:00
parent 2074861b57
commit bf74ffe974
1 changed files with 7 additions and 4 deletions
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11
src/netif/etharp.c
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@ -663,7 +663,7 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
}
/**
* Send an ARP request for the given IP address.
* Send an ARP request for the given IP address and/or queue a packet.
*
* If the IP address was not yet in the cache, a pending ARP cache entry
* is added and an ARP request is sent for the given address. The packet
@ -672,8 +672,11 @@ etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
* If the IP address was already pending in the cache, a new ARP request
* is sent for the given address. The packet is queued on this entry.
*
* If the IP address was already stable in the cache, the packet is
* directly sent. An ARP request is sent out.
* If the IP address was already stable in the cache, and a packet is
* given, it is directly sent and no ARP request is sent out.
*
* If the IP address was already stable in the cache, and no packet is
* given, an ARP request is sent out.
*
* @param netif The lwIP network interface on which ipaddr
* must be queried for.
@ -723,7 +726,7 @@ err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q)
(arp_table[i].state == ETHARP_STATE_STABLE)));
/* do we have a pending entry? */
if (arp_table[i].state == ETHARP_STATE_PENDING) {
if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
/* try to resolve it; send out ARP request */
result = etharp_request(netif, ipaddr);
}