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.
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 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.... -----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 -- Volker Kuhlmann is possibly list0570 with the domain in header http://volker.dnsalias.net/ Please do not CC list postings to me.
