Hi all, TL;DR ===== I'm looking for an Optus-approved cable modem whose Ethernet port I can plug into my WNDR3800 router such that the WNDR3800 is directly exposed to the public IP address, with no private addressing or NAT in the way. Which one, if any, should I choose? Long version ============ Where I live, I'm stuck with Optus cable as my broadband internet (short story is we're too far from the exchange to get ADSL, despite being in the middle of suburban Melbourne), and we're looking at upgrading our plan to something faster. We currently get something like 8-10 Mbit/sec down and 128-256 Kbit/sec up, and we can allegedly upgrade to 20 Mbit/sec down and 2 Mbit/sec up. Trouble is, to do this Optus tell us we need to upgrade our modem. Currently we have a Motorola SB5101, which takes the coax cable in, and spits out a single Ethernet interface that goes into the WAN port on my OpenWRT Netgear WNDR3800 router, and just gives me a public IP address on the router. Below is the approved equipment list from Optus[1]: Manufacturer Model(s) ========================== Motorola SB4100, SB4101, SB4200, SB5100, SB5101 Netgear CG814WG, CVG824G, CG3000 CISCO EMTA2203, DPQ3212, DPQ3925 I note that my modem is already on there, but allegedly (second-hand information) the woman at Optus suggested a Netgear or a CISCO. So having reviewed a couple of the Netgear modems (on the basis thay they're almost certainly cheaper than the CISCOs), I've found that they've got a lot of router smarts in them, and have 4 LAN ports, WiFi, NAT, and all manner of other things that you want in a router, but that I don't want in a modem running proprietary software. I would like to be able to plug a modem's Ethernet port directly into my current router, and have *my* router do all the hard work of NATting and private addressing etc. Does anybody know if any of the modems listed above can do this, while supporting whatever new stuff is required to obtain the 20 Mbit/sec speeds being offered (I don't know enough about cable internet to understand what exactly needs upgrading)? 1. https://www.optus.com.au/shop/Broadband/Offers-&-Extras/Approved-Equipm… -- Regards, Matthew Cengia