Logs from wireless routers disclosing L2/MAC info?

[John Conover]

Some of the popular wireless routers have an option to email
access/security logs to an account on the Internet. When enabled, the
logs contain the last 24 bits of the MAC address of the router's cable
modem port, (the rest could be guessed since the brand name is
included in the email,) and, the MAC address of the cable modem's
router port.

Was I potty trained wrong, or is this risky.

    Thanks,

    John

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John Conover, conover at rahul.net, http://www.johncon.com/