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edited Oct 4, 2014 at 21:45

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Identical MAC address on two different VM, yet I have internet connectivity

I have set up a network as such: Set up host-only networking on VirtualBox. The first adapter is configured with NAT, the second with host-only networking

HOST: Windows
GUEST: CentOS VM1, CentOS VM2 (clone of VM1)

When executing ifconfig -a on both VMs, I noticed that the MAC addresses are exactly the same. My question is how am I able to ping from VM1 to VM2 considering that the MAC addresses are the same?

VM1: eth0 Link encap:Ethernet HWaddr 08:00:27:AF:A3:28
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:feaf:a328/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:27 errors:0 dropped:0 overruns:0 frame:0 TX packets:47 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:10671 (10.4 KiB) TX bytes:5682 (5.5 KiB)

eth1 Link encap:Ethernet HWaddr 08:00:27:C4:A8:B6
inet addr:192.168.56.102 Bcast:192.168.56.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fec4:a8b6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:859 errors:0 dropped:0 overruns:0 frame:0 TX packets:41 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:114853 (112.1 KiB) TX bytes:4823 (4.7 KiB)

[oracle@localhost ~]$ ip -6 addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 fe80::a00:27ff:feaf:a328/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 fe80::a00:27ff:fec4:a8b6/64 scope link valid_lft forever preferred_lft forever

VM2:

eth0 Link encap:Ethernet HWaddr 08:00:27:AF:A3:28
inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:feaf:a328/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:114 errors:0 dropped:0 overruns:0 frame:0 TX packets:151 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:41594 (40.6 KiB) TX bytes:13479 (13.1 KiB)

eth1 Link encap:Ethernet HWaddr 08:00:27:C4:A8:B6
inet addr:192.168.56.101 Bcast:192.168.56.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fec4:a8b6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1900 errors:0 dropped:0 overruns:0 frame:0 TX packets:78 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:259710 (253.6 KiB) TX bytes:9736 (9.5 KiB)

networking ip ethernet mac-address

asked Oct 4, 2014 at 12:22

user

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