Proxy ARP enabled?

No like below.

net.ipv4.conf.eth0.proxy_arp = 0 net.ipv4.conf.lo.proxy_arp = 0 net.ipv4.conf.default.proxy_arp = 0 net.ipv4.conf.all.proxy_arp = 0

Thanks.

----------------------------------------

Date: Thu, 6 Aug 2009 20:00:54 +0200 From: timo.schoeler@riscworks.net To: centos@centos.org Subject: Re: [CentOS] so many arp caches why?

thus nate spake:

...

MontyRee wrote:

...

Hello, all.

When I execute arp -a -n, there are lots of arp caches like below. Surely, I set netmask and Broadcast without problem and routing table also no problem.

System is CentOS release 4.7 i386.

I know how to delete the arp cache, but I don't know why ..

run tcpdump on the interface, to see what is happening on it. nate

Proxy ARP enabled?

Timo _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

_________________________________________________________________ 메신저 쓰면서 황당하거나, 재미있었던 경험 있으세요? 애기 나누고 이벤트도 참여하세요! http://im.msn.co.kr/im/main/mainCoverDetail.asp?BbsCode=bbs01&Seq=2688

Some other device on the subnet is doing proxy arp.

No. there is no other card. and as you see, arp caches from eth0..

? (72.18.205.157) at 00:23:5E:12:63:FE [ether] on eth0

I updated all packages including kernel and rebooted but there was no changes..

----------------------------------------

Date: Thu, 6 Aug 2009 13:58:59 -0500 From: lesmikesell@gmail.com To: centos@centos.org Subject: Re: [CentOS] so many arp caches why?

MontyRee wrote:

...

Hello, all.

When I execute arp -a -n, there are lots of arp caches like below. Surely, I set netmask and Broadcast without problem and routing table also no problem.

System is CentOS release 4.7 i386.

I know how to delete the arp cache, but I don't know why ..

# ifconfig eth0 Link encap:Ethernet HWaddr 00:A0:D1:E7:91:CC inet addr:192.168.195.36 Bcast:192.168.195.63 Mask:255.255.255.192

# route -n 192.168.195.0 0.0.0.0 255.255.255.192 U 0 0 0 eth0 0.0.0.0 192.168.195.36 0.0.0.0 UG 0 0 0 eth0

# arp -a -n

? (120.88.46.10) at 00:23:5E:12:63:FE [ether] on eth0 ? (208.80.195.54) at 00:23:5E:12:63:FE [ether] on eth0 ? (125.122.171.33) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.233.26.29) at 00:23:5E:12:63:FE [ether] on eth0 ? (111.125.201.75) at 00:23:5E:12:63:FE [ether] on eth0 ? (218.24.196.100) at 00:23:5E:12:63:FE [ether] on eth0 ? (60.190.216.31) at 00:23:5E:12:63:FE [ether] on eth0 ? (72.232.223.58) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.39.135.185) at 00:23:5E:12:63:FE [ether] on eth0 ? (203.171.229.153) at 00:23:5E:12:63:FE [ether] on eth0 ? (121.11.81.217) at 00:23:5E:12:63:FE [ether] on eth0 ? (61.110.195.18) at 00:11:43:E0:7D:19 [ether] on eth0 ? (61.164.112.5) at 00:23:5E:12:63:FE [ether] on eth0 ? (218.66.79.152) at 00:23:5E:12:63:FE [ether] on eth0 ? (221.139.48.11) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.233.26.12) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.137.175.2) at 00:23:5E:12:63:FE [ether] on eth0 ? (116.71.174.203) at 00:23:5E:12:63:FE [ether] on eth0 ? (72.18.205.157) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.39.136.4) at 00:23:5E:12:63:FE [ether] on eth0 ? (202.255.47.226) at 00:23:5E:12:63:FE [ether] on eth0 ? (211.211.52.134) at 00:23:5E:12:63:FE [ether] on eth0 ? (218.61.2.197) at 00:23:5E:12:63:FE [ether] on eth0 ? (61.164.151.12) at 00:23:5E:12:63:FE [ether] on eth0

Some other device on the subnet is doing proxy arp.

-- Les Mikesell lesmikesell@gmail.com

---

CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

_________________________________________________________________ 매일 매일 기분에 따라 메신저 스킨을 바꿔보세요! http://im.msn.co.kr/im/main/mainCoverDetail.asp?BbsCode=bbs01&Seq=2687

Thanks for your answer.

Not another card, another network device - the one with 00:23:5E:12:63:FE as it's ethernet MAC address.

There is no another network device as I know. Can I check by some command except ifconfig or ip?

# ip link show 1: lo: mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:a0:d1:e7:91:cc brd ff:ff:ff:ff:ff:ff 3: eth1: mtu 1500 qdisc noop qlen 1000 link/ether 00:a0:d1:e7:91:cd brd ff:ff:ff:ff:ff:ff 4: sit0: mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0

Your eth0 MAC address is: 00:A0:D1:E7:91:CC from the ifconfig output you posted. Look though the rest of the arp list to find the IP address in the 192.168.195.xx range with the 00:23:5E:12:63:FE MAC to see which device is sending the arps.

00:23:5E:12:63:FE is a cisco vendor device and gateway mac address. Is it a bug of the NIC or OS?

Thanks.

_________________________________________________________________ 메신저 친구가 갑자기 돈을 빌려달라고 하면 전화 확인은 필수입니다. 주의하세요! http://im.msn.co.kr/im/main/mainFaqDetail.asp?seq=96&page=1&BbsCode=...