Не понимаю,
1) почему arping2 работает, а ping - нет
2) почему mac-адреса такие похожие на разных машинах
Gentoo_x64 ~ # ifconfig eth4
eth4 Link encap:Ethernet HWaddr 00:16:e3:a5:16:7e
inet addr:192.168.4.191 Bcast:192.168.4.255 Mask:255.255.255.0
inet6 addr: fe80::216:e3ff:fea5:167e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Gentoo_x64 ~ # ping 192.168.4.1
PING 192.168.4.1 (192.168.4.1) 56(84) bytes of data.
^C
--- 192.168.4.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1000ms
Gentoo_x64 ~ # arping2 192.168.4.1
ARPING 192.168.4.1
42 bytes from 00:16:e3:a5:16:7c (192.168.4.1): index=0 time=1.661 msec
42 bytes from 00:16:e3:a5:16:7c (192.168.4.1): index=1 time=1.973 msec
^C
--- 192.168.4.1 statistics ---
2 packets transmitted, 2 packets received, 0% unanswered
Gentoo_x64 ~ # route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.4.0 0.0.0.0 255.255.255.0 U 0 0 0 eth4