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<FONT face=Tahoma size=2><B>From:</B> centos-bounces@centos.org
[mailto:centos-bounces@centos.org] <B>On Behalf Of </B>chloe K<BR><B>Sent:</B>
Friday, November 28, 2008 12:36 PM<BR><B>To:</B> CentOS mailing
list<BR><B>Subject:</B> Re: [CentOS] Neighbour table
overflow<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>you have the network /20 so that you got this neigbour overlfow</DIV>
<DIV>you should subnet it</DIV>
<DIV> </DIV>
<DIV><BR><SPAN class=390264019-28112008><FONT face=Arial color=#0000ff
size=2> Hi Chole,</FONT></SPAN></DIV>
<DIV><SPAN class=390264019-28112008></SPAN> </DIV>
<DIV><SPAN class=390264019-28112008><FONT face=Arial color=#0000ff size=2>I have
no clue as to what that means. :-(</FONT></SPAN></DIV>
<DIV><SPAN class=390264019-28112008></SPAN> </DIV>
<DIV><SPAN class=390264019-28112008> </SPAN><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>
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