Telstra supplied modems and OpenWrt

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mew99

2 posts

Wannabe Geek

#139285 3-Feb-2014 18:07

Hi. I'm finally making the move from standard telecom DSL to the Telstra/Vodafone cable network, but before I commit, I have a few questions about their modems.

Does their provided modem have built in NAT/Routing/Firewall?

If so, can the aforementioned features be disabled? I currently have a Netgear N900 running OpenWrt, and want the openwrt router to be in charge in all of the above, and the Telstra modem to simply provide a public IP over its ethernet connection.

Cheers.

Coil

6614 posts

Uber Geek
Inactive user

#979651 3-Feb-2014 19:18

Hi,

Not supported by us, If the modem is in the list and you want to risk it.
AFAIK for cable the modem is just a RGW as it is for UFB.

Cheers

sbiddle

30853 posts

Uber Geek

Retired Mod

Trusted

Biddle Corp

Lifetime subscriber

#979688 3-Feb-2014 20:14

Your setup makes absolutely no sense.

I don't understand what you're trying to do and why you simply wouldn't plug your router directly into the cable modem (which is simply a layer 2 bridge).

mew99

2 posts

Wannabe Geek

#979805 3-Feb-2014 22:54

What part isn't making sense? I have a router, with a wan port, and 5 port lan. It has a NAT, and firewall between the WAN and the LAN, and routes between them.

My question in the simple possible terms, is whether the telstra modems are actually pure modems or modem + routers. Because, if the telstra modem is also doing NAT and routing, I would simply have a direct bridge between LAN and WAN, as opposed to routing and NAT between the two zones because having two lots of NAT on the network would increase latency.

Does the telstra modem on its ethernet port supply an internal (192.168.xx or 10.xxx.xx) or external IP address?

Hope I've made my question a little clearer.

Thanks.

EDIT:

I think I get how it works. The telstra modem simply OSI L2 bridges its internal CATV interface with its ethernet port. I then plug it into my router's WAN port, and assign a static IP address provided by telstra to the router's WAN port interface.

If this is the case, this thread may be locked.

graemeh

2078 posts

Uber Geek

#979877 4-Feb-2014 07:54

mew99: EDIT: I think I get how it works. The telstra modem simply OSI L2 bridges its internal CATV interface with its ethernet port. I then plug it into my router's WAN port, and assign a static IP address provided by telstra to the router's WAN port interface. If this is the case, this thread may be locked.

Yes, you've got it and your question made perfect sense.

Vodafone tell you the address to assign to whatever you plug into the cable modem. It is up to you to handle routing etc to any other equipment you want to use with the service.

NikT

1710 posts

Uber Geek

Trusted

#979886 4-Feb-2014 08:28

Hey there,

As noted above, the cable modems are just bridges to the DOCSIS network. Plug your assigned static IP/default gateway/DNS/subnet mask into the router & away you go.

If you fancy doing more research, the cable modem models supplied by Vodafone are the Motorola SurfBoard SB5101/SB5101U & the Cisco DPC3008. You'll get the latter more often than not these days, as the former is not capable of DOCSIS3.0 speeds.

Cheers,

- Nik

Product Manager @ PB Tech

Smartphones @ PB Tech | Headphones @ PB Tech

timmmay

20574 posts

Uber Geek

Trusted

Lifetime subscriber

#979892 4-Feb-2014 08:49

As was said above, modems aren't routers, they're simple devices you plug your own router into. Assign a static IP to the router and other settings as required and you're all good. Just let TC set it up on your computer (they did for me anyway), then transfer those settings to the router. I don't know if they'll do the router setup for you.

sbiddle

30853 posts

Uber Geek

Retired Mod

Trusted

Biddle Corp

Lifetime subscriber

#979917 4-Feb-2014 09:44

graemeh:
mew99: EDIT: I think I get how it works. The telstra modem simply OSI L2 bridges its internal CATV interface with its ethernet port. I then plug it into my router's WAN port, and assign a static IP address provided by telstra to the router's WAN port interface. If this is the case, this thread may be locked.

Yes, you've got it and your question made perfect sense.

Vodafone tell you the address to assign to whatever you plug into the cable modem. It is up to you to handle routing etc to any other equipment you want to use with the service.

The OP edited his post quite significantly after posting it. It makes sense now, but originally it sounded like he wanted some sort of double NAT setup so he could use his own router.

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graemeh

2078 posts

Uber Geek

#980337 4-Feb-2014 21:47

sbiddle:
graemeh:
mew99: EDIT: I think I get how it works. The telstra modem simply OSI L2 bridges its internal CATV interface with its ethernet port. I then plug it into my router's WAN port, and assign a static IP address provided by telstra to the router's WAN port interface. If this is the case, this thread may be locked.

Yes, you've got it and your question made perfect sense.

Vodafone tell you the address to assign to whatever you plug into the cable modem. It is up to you to handle routing etc to any other equipment you want to use with the service.

The OP edited his post quite significantly after posting it. It makes sense now, but originally it sounded like he wanted some sort of double NAT setup so he could use his own router.

Thanks for making that clear, I only saw the edited version.