<div>you have the network /20 so that you got this neigbour overlfow</div> <div>you should subnet it</div> <div> </div> <div><BR><BR><B><I>Robert Moskowitz <rgm@htt-consult.com></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">tdukes@sc.rr.com wrote:<BR>> ---- Robert Moskowitz <RGM@HTT-CONSULT.COM>wrote: <BR>> <BR>>> Thomas Dukes wrote:<BR>>> <BR>>>> <BR>>>><BR>>>> *From:* centos-bounces@centos.org [mailto:centos-bounces@centos.org] <BR>>>> *On Behalf Of *chloe K<BR>>>> *Sent:* Thursday, November 27, 2008 9:10 PM<BR>>>> *To:* CentOS mailing list<BR>>>> *Subject:* Re: [CentOS] Neighbour table overflow<BR>>>><BR>>>> what is your netmask? <BR>>>> <BR>>>> eth0 = 255.255.240.0<BR>>>> <BR>>> Why do you have such a large subnet? There are a number of potential
<BR>>> performance problems with such a setup. I typically only see this in <BR>>> large, bridged wireless campuses. Little justification for it in a <BR>>> wired network. (I do have lots of networking experience and knowledge, <BR>>> having consulted with a number of large deployments).<BR>>><BR>>> Even with a large subnet, you should not be arping everywhere. Either <BR>>> two things are happening:<BR>>><BR>>> Your system is recording every ARP request it sees ('Who has IP <BR>>> x.x.x.x') to avoid arping later. Bad behaviour (IMNSHO), given your <BR>>> network.<BR>>><BR>>> Your system is ARPing for every IP address in the subnet to learn all of <BR>>> its neighbors. WHy would it do that? Unless you have some snooping <BR>>> software running on your system.<BR>>><BR>>> <BR>> Hi Robert,<BR>><BR>> I did not set this value. Something did but not me.<BR>><BR>>
I am on a roadrunner connection with a dynamic ip. What do you suggest I change it to?<BR>You might not have much control over it if you are using DHCP.<BR><BR>route -n<BR><BR>will supply you with your router address. Once you now that and your <BR>assigned IP address (and lease) you can use ifconfig to change your <BR>netmask so that your router and you are in the same subnet.<BR><BR>What is the address also of your nameserver (/etc/resolv.conf) and mail <BR>server? If these are also within that hugh subnet, your netmask has to <BR>keep them 'local'.<BR><BR>Roadrunner.... hmm.<BR><BR><BR>_______________________________________________<BR>CentOS mailing list<BR>CentOS@centos.org<BR>http://lists.centos.org/mailman/listinfo/centos<BR></BLOCKQUOTE><BR><p>
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