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 show1: lo: mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:002: eth0: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:a0:d1:e7:91:cc brd ff:ff:ff:ff:ff:ff3: eth1: mtu 1500 qdisc noop qlen 1000 link/ether 00:a0:d1:e7:91:cd brd ff:ff:ff:ff:ff:ff4: 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=bbs03&Category=03&ser_k=a&ser_v=_______________________________________________CentOS mailing listCentOS@xxxxxxxxxxxxxx://lists.centos.org/mailman/listinfo/centos