On Fri, 05 Mar 2004 22:07, Christopher Sawtell wrote: > On Fri, 05 Mar 2004 21:31, Volker Kuhlmann wrote: > > > The fact that the device can act as a DHCP server does not suggest that > > > it can also do NAT. The two are not related. > > > > I assume we're talking about their cable modem, not their ADSL > > whatever. > > That's my understanding of the matter. > > > The modem comes with no useful documentation, and there is no > > IP for the modem itself available. That means if you want to send any > > packet to the modem, you're out of luck, it's not addressible. > > Oh? How come I can do this? I'm genuinely interested. > > [EMAIL PROTECTED] chris $ ping modem > PING modem (192.168.100.1) 56(84) bytes of data. > 64 bytes from modem (192.168.100.1): icmp_seq=1 ttl=254 time=7.51 ms > 64 bytes from modem (192.168.100.1): icmp_seq=2 ttl=254 time=4.84 ms > 64 bytes from modem (192.168.100.1): icmp_seq=3 ttl=254 time=4.85 ms > 64 bytes from modem (192.168.100.1): icmp_seq=4 ttl=254 time=4.82 ms > > --- modem ping statistics --- > 4 packets transmitted, 4 received, 0% packet loss, time 3031ms > rtt min/avg/max/mdev = 4.829/5.509/7.510/1.158 ms > > Port 80 on the modem is open too. > Have a look, it's quite interesting. Same O/S as the one NASA sent to Mars. > > > I've heard that the link between modem and Telstra is NATed, > > I gather, looking at the log on the modem, that it is a DHCP address > permanently allocated to the MAC address of the modem as viewed from the > Telstra side. There is a tftp server, visible from their side, running > which allows T/C/P to send a particular config setup to your modem. This is > how they set the traffic shaping etc., etc.. > > > but who cares, it's transparent. > > It is, as wide as the proverbial barn door. > > > View the modem as a dumb cable/ethernet bridge. > > It's quite a bit brighter than my understanding of meaning of the word > 'dumb'. > > > If it does dhcp, count that as a bonus. > > A bonus of, imho, dubious benefit, because there is no IP packet filtering.
what is the connection between dhcp and packet filtering?
