On Wed, Jan 23, 2013 at 02:11:38PM +0000, Celejar wrote: > I recently purchased and began using a cable modem - the Zyxel (Hitron) > BRG-35503: > > http://www.hitrontech.com/en/cable_detail.php?id=3 > > It (so far) Just Works (I plugged into my router running OpenWRT, the > router gets an IP address (via DHCP), and we have net connectivity), > but I'd like to hack into the device, to play with it, find any > tunables and settings, and just understand it better. > > The public interface of the router gets an IP address from my ISP's > address space, and that's the IP address that outbound connections are > initiated from. Tracerouting out shows the first hop as a private IP > address on my LAN (192.168.0.1), and the next hop is an address in my > ISP's space (specifically, the address the router is getting assigned > but with the last quad replaced with '1').
That IP address (x.x.x.1) is probably your ISP router - .1 is commonly used for routers. > The thing comes with no manual or disk, just a quickstart guide, > containing nothing beyond very basic quickstart instructions. I have no > idea if this thing even has a web interface - I can't find one on any > of the addresses I've tried. I've tried portscanning with nmap, > pointing it at the address of the first hop, and I get no open ports, > and the only closed one is 179/bgp; I'm guessing this is my ISP's edge > router. Hm... surely the thing must have an internal IP address. Perhaps the OpenWRT can tell you? If it got its IP address via DHCP, it should have it's default gateway set to the IP address of the cable modem. > > Am I correct in assuming that my modem has no IP address, and is > operating in bridge mode? Any idea how I can access it? The thing's > datasheet claims that it has "extensive SNMP management support", but I > have never used snmp and I have no idea what to do with it. Try running nmap(1) against it - on the internal IP address of it. Perhaps it supports UPNP ? If so, you may be able to use the upnp-router-control package/app to extract some interesting information from it.. -- Karl E. Jorgensen -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130123144605.GD8749@hawking
