I have searched mc and can't find any kind of DHCP log for SME v5.0.  I would like to have a log of IPs with the MAC addresses to backup SARG logs that report internet access by IP.  I need to prove that a machine had a certain IP address at a certain time.  How long is the lease for SME DHCP server?  
A "sarg" type program for DHCP records would be great, but I will settle on a text file if one exists.
Thanks in advance,
rudy