On Mon, 08 Mar 2004 09:26, Craig Falconer wrote: > AFAIK the cablemodem is a transparent ethernet bridge. Internally on their > side Paradise/TC can talk to the modem on an ip about 172.x.x.x. Agreed.
> As for pinging 192.168.100.1, then your cablemodem must be a newer one. > Mine are the older GE and the older motorola ones, and don't respond on > that IP (last year we would have had a workstation on that IP.) The number is configurable on my one to any number in the 192.168.100.0 Class C net block > The cablemodem cannot do NAT, but it does have the possibility of routing > up to 16 or 32 real IPs, provided your ISP will sell them to you. Thus you > can have 202.0.37.2 and .3, and the cablemodem will route each IP to an > internal machine. But P/TC don't do that... Maybe when IPv6 is out.... I expect we are all at cross-purposes because we all have different makes and types of modems from T/C/P. Mine, a General Instrument SB-3200 ( Subsequently Motorola ) certainly has NAT, and DHCP, in it. Copying from the 'Configuration Manager' page of the www based interface for the modem:- Enable DHCP Server ( This tick-box is not enabled on delivery from T/C/P ) The SURFboard cable modem can be used as a gateway to the Internet by a maximum of 32 users on a Local Area Network (LAN). When the Cable Modem is disconnected from the Internet, users on the LAN can be dynamically assigned IP Addresses by the Cable Modem DHCP Server. These addresses are assigned from an address pool which begins with 192.168.100.11 and ends with 192.168.100.42. Statically assigned IP addresses for other devices on the LAN should be chosen from outside of this range. ( Evidently no routing of incoming packets? ) > -----Original Message----- > From: Volker Kuhlmann [mailto:[EMAIL PROTECTED] > Sent: Saturday, 6 March 2004 1:25 p.m. > To: [EMAIL PROTECTED] > Subject: Re: Telstra cable > > > [EMAIL PROTECTED] chris $ ping modem > > PING modem (192.168.100.1) 56(84) bytes of data. > > Cool, didn't know that. Works for me too. Funny thing is, the firewall has > > Destination Gateway Genmask > 0.0.0.0 203.79.122.1 0.0.0.0 > > and therefore theoretically, the packets to 192.168.100.1 should go to > Telstra's gateway. I conclude the modem is intercepting them although they > aren't addressed to it, and that's the only reason one can talk with the > modem. The modem still does not have an addressable interface, there's no > MAC address or arp listing for it. The arp table contains a MAC address for > Telstra's gateway, but not for the modem. > > > Port 80 on the modem is open too. > > Not much else than 80 though. As one would expect. > > > Have a look, it's quite interesting. > > Indeed! > > > Same O/S as the one NASA sent to Mars. > > Yeah, and which stopped working a day after... hmm. Ok. Never mind. > > VxWorks is the most common real-time OS for embedded systems. The company, > Wind River Systems, is rather caustic towards Linux (perhaps because they > don't get royalties? hihiii). > > > > View the modem as a dumb cable/ethernet bridge. > > > > It's quite a bit brighter than my understanding of meaning of the word > > 'dumb'. > > "dumb cable/ethernet bridge" is a technical term for one of exactly those > modems, I understand. "dumb terminals" are also a lot brighter than what > you're suggesting. (especially when you turn the lights off :) ) > > > A bonus of, imho, dubious benefit, because there is no IP packet > > filtering. > > Ack. Does seem to exist though: "Enable DHCP Server The SURFboard cable > modem can be used as a gateway to the Internet by a maximum of 32 users on > a Local Area Network (LAN). When the Cable Modem is disconnected from the > Internet, users on the LAN can be dynamically assigned IP Addresses by the > Cable Modem DHCP Server. ..." > > Volker -- Sincerely etc. Christopher Sawtell NB. This PC runs Linux. If you find a virus apparently from me, it has forged the e-mail headers on someone else's machine. Please do not notify me when this occurs. Thanks.
