That Transmission part is ok . what i'm doing is assining a ip via dhcp server . but there must be the firewall to block the unknown MAC . I don't try to block MAC addresses via DHCP . because those assigning ips will not be the fixed for the users. so overcome that problem i'm trying to use a iptables firewall. Actually i'm new to iptables . i don't have exact idea of how to block unknown MACs and allow trusted MACs. so actually this is the thing that i want to do . pls ...........can u knidly help me thanx --- Rob Sterenborg <rob@xxxxxxxxxxxxxxx> wrote: > > I still find it hard to believe that your modem > users have > > MAC addresses - all dialup systems I have seen use > PPP Point > > to Point Protocol and there is no MAC address > identifying the > > remote system. > > I agree to this part, but he was talking about > dialup/cable access. > When I had cable access from Chello/UPC I had a > LanCity modem and it > actually had a MAC address. (Which could be abused > to get higher up/down > bandwith.) > > > Gr, > Rob > > __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree