Talking to my cable modem
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').
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.
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.
Celejar
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