no. he can subnet it Typically ISP can assign /20. but client can subnet it two networks /22 /22 or 16 networks /24 Thank you John R Pierce <pierce at hogranch.com> wrote: chloe K wrote: > you have the network /20 so that you got this neigbour overlfow > you should subnet it > no, no, NO. his eth1 connection is from his ISP. He /has/ to use the supplied netmask, he can't reconfigure their network segment. now, why is ARP table is overflowing is another issue entirely. Thomas, can you try this? Do.... arp -an | grep 65.188.0.1 and pick out the "MAC" address of your gateway router, this will look something like... ? (65.188.0.1) at 00:17:CB:4F:97:81 [ether] on eth1 So, the MAC address above is 00:17:CB:4F:97:81 ... yours definitely will be different.... now, # tcpdump -i eth1 -n ip host 65.188.xxx.xxx and not ether host 00:17:CB:4F:97:81 (replacing that with your gateway router's MAC address as determined from that ARP command, and xxx.xxx with your eth1 IP address as shown in `ifconfig eth1`) this will catch all traffic between you and another IP on your ISP local segment thats NOT talking to the gateway router paste 50 lines or so of the output of this here and maybe we can figure out whats going on. _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos --------------------------------- Instant message from any web browser! Try the new Yahoo! Canada Messenger for the Web BETA -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20081201/03957e31/attachment-0004.html>