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etharp: reduce ARP aging timeout from 20 minutes to 5 minutes, since this is a time obviously used in some switches as MAC learning table timeout. Having our ARP timeout higher than this can lead to sending unicast packets to multiple network segments.

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sg 2015-03-24 20:04:18 +01:00
parent 210496f0ca
commit 86970a01d7
1 changed files with 3 additions and 2 deletions
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5
src/netif/etharp.c
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@ -75,9 +75,10 @@ const struct eth_addr ethzero = {{0,0,0,0,0,0}};
/** the time an ARP entry stays valid after its last update,
* for ARP_TMR_INTERVAL = 1000, this is
* (60 * 20) seconds = 20 minutes.
* (60 * 5) seconds = 5 minutes.
*/
#define ARP_MAXAGE 1200
#define ARP_MAXAGE 300
/** Re-request a used ARP entry 1 minute before it would expire to prevent
* breaking a steadily used connection because the ARP entry timed out. */
#define ARP_AGE_REREQUEST_USED_UNICAST (ARP_MAXAGE - 30)