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just out of curiosity. i've been looking at various modem manufacturers' websites and it seems clear that there are firewall logs and event logs but i don't know whether the event logs would cover the pppoe or dhcp assignment on the part of the isp.

the router i'm curious about is the siemens speedstream 6520...

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If you have the router, you could try viewing the syslog logs directly from another machine using these steps:

  1. Configure syslogd on a machine and do not forget to allow it to receive log data from remote hosts (-r on Unix syslogd).
  2. Open the telnet console for the device (requires knowledge of the telnet user and passwd).
  3. Enter the following command: xsh> cfg slog{ip=a.b.c.d, where a.b.c.d is the ip address of the system running syslogd.

From this thread.

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