Messages in this thread | | | Date | Mon, 25 Feb 2002 20:42:38 +0100 | From | Ragnar Hojland Espinosa <> | Subject | Re: static arp table doesn't size up ? |
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On Mon, Feb 25, 2002 at 11:43:15AM +0100, Vincent Bernat wrote: > Hi ! > > We have a 2.4.16 generic kernel and we run into troubles with arp. We > have an ethernet segment of 600+ machines. On one of these machines, I > have set up a static arp table by entering every mac-ip couple. > > For several days, I have left the ARP learning (ifconfig eth0 arp) and > there was no problem. Every 5 minutes, I have checked if there was > learned address in the arp cache : there was none, so it didn't learn > any new address. > > Today, I have switch to a real static arp table (with ifconfig eth0 > -arp). Randomly, some machines were then unable to ping the > host. > > After a "ifconfig eth0 arp ; ifconfig eth0 -arp", this some other > machine which were unable to ping the host where the first machines > are able to do it again. arp table is correct but randomly, some > machines are unable to get their echo reply, even if its entry is in > the arp table. > > Are there known issues about large arp tables ?
You may want to try to increment the thresholds for garbage collection in net/ipv4/arp.c or play with the userland arpd in case the kernel is having problem allocating as many ARP entries as you are using.
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