LAN and WAN share the same MAC address -- could this be a security issue?
When I bought the AEBS(n), I was a bit surprised to see only one ethernet MAC address listed (on bottom of unit, or was it in config utility?), in addition to wireless MAC. My main router has two ethernet MACs.
So last nite, I investigated. I confirmed my suspicion that both the WAN port and the LAN ports share the same MAC address! My setup has the AEBS WAN port plugged into my home LAN's main router, and a Linux machine plugged into a LAN port of the AEBS.
View of AEBS WAN side (from main router at 192.168.1.1)
ii# arp
Seconds IP Address MAC Address
734 66.130.224.1 001120A87AF5 -- ISP router
789 192.168.1.21 0016CBC430A6 -- AEBS WAN port
28 192.168.1.33 0010DC47DC53 -- home PC
824 192.168.1.73 00065BB2F295 -- work PC
View of AEBS LAN side (from a Linux box at 10.0.1.41)
root@LKG7CAE25 # cat /proc/net/arp
IP address HW type Flags HW address Mask Device
10.0.1.1 0x1 0x2 00:16:CB:C4:30:A6 * eth0
10.0.1.1 on the LAN side of AEBS and 192.168.1.21 on the WAN side of the AEBS both use the same MAC address, 00:16:CB:C4:30:A6.
I tried to provoke some leakage between the two sides (for example with broadcast packets), but haven't been able to do it so yet. Perhaps the switch in front of the eth MAC has enough smarts to keep the two subnets separate? Still it sort of worries me, if I used the AEBS as my only router, that both WAN and LAN go thru the same ethernet MAC (same h/w). I browsed here but found no discussion on this.
Comments anyone?
.... This is why there are separate MAC addresses
for ethernet and wireless, they are physically
different networks. In the case of the WAN/LAN, both
are ethernet-type networks but are physically
distinct (this is the purpose of a router like the
AEBS), so having the same MAC address on both sides
won't cause any sort of collision nor should it be
possible to leak across networks. MAC addresses can't
be used for routing beyond the physical network.
If it is indeed two different NICs sharing a single MAC, then indeed it is not an issue as you would never want to connect these two NICs together. But is it really two NICs?
My worry is that these two subnets are on the same physical network, with some magic going on to keep them separate anyway. Do we have some picture of AEBS internals? Maybe that would answer the question...
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