Hi !

I currently host a couple of website at home using dedicated custom built mail servers and web servers on my cable internet connection.

My Cable company only gives out Dynamic IP's.

I currently use a Netgear RP114 router with Port Forwarding which works great.

However, in a couple of months I will be upgrading to an ADSL modem then onto Leased Line equipment (Probably a T1/E1), I therefore want a router with expansion and of a high quality such as the Cisco 3600 series router(s).

What I simply want to know is, If I buy a 3620/3640 router w/ 2 Ethernet ports, can I plug one into the cable modem and one into my network ?? And then configure the router with NAT just as my current router. Would this be possible and/or difficult to do ? When I get ADSL I will get static IP's, is it possible to turn off NAT and still maintain the 2 network interface config as above ?

Thankyou for all the help !

A 36xx would be very much overkill for what you are doing, look at a Cisco 2621 instead.

A router can only route between netblocks. So, what you are proposing will work fine for your Cable modem, but you will not be able to turn off NAT when you get your DSL line, becase your ADSL modem will be acting like a router. So, even though you will have a dedicated IP Address, because you are going through two routers, you will need two netblocks.

You will be able to stop using NAT when you get a T1+.

Thanks for the prompt reply.

Reason for mentioning the 36xx is because it is currently available to me for a cheaper price than a 2621.

A friend of mine has an ADSL modem, router then a switch and pc's with static internet IP's.

I thought this would be possible with the 3620 ? Because it would effectively act the same as an DSL/Cable router would, e.g.

Future Config;

3620 Eth0 - Cable/ADSL Modem
3620 Eth1 - Switch then Servers with static ip's

Current Config;

RP114 Cable Router (WAN Port) - Cable/ADSL Modem
RP114 Cable Router - Switch then Servers with static ip's

Would this be possible ??? I have a strong feeling that my friend has a router with built in ADSL modem, its a 3com.

If it is true that I have to use NAT with both my cable modem and DSL modem, how can I use multiple static ip's, sorry for any confusio, I forgot to mention the inclusion of around 8 static IP's, would I then be able to turn off NAT ?

Thanx !:eek:

Originally posted by richardparry

I thought this would be possible with the 3620 ? Because it would effectively act the same as an DSL/Cable router would, e.g.

Future Config;

3620 Eth0 - Cable/ADSL Modem
3620 Eth1 - Switch then Servers with static ip's


It depends, if one of the IPs is bound to your DSL modem, and acts as the gateway, then no, it will not work. If the DSL modem is just a modem with no IP bound to it, then it will work. Not sure how your provider is set up, you would need to check with them.


Originally posted by richardparry

If it is true that I have to use NAT with both my cable modem and DSL modem, how can I use multiple static ip's, sorry for any confusio, I forgot to mention the inclusion of around 8 static IP's, would I then be able to turn off NAT ?


Because your DSL modem is most likely a modem/router combination (like a Lucent PipeDSL). So the modem is configured with one of your IPs, and the rest of the servers point to it as a gateway.

My recommendation would be to check with your provider to find out what type of equipment they provide you with. If it is a modem/router combination don't waste your time with the 3600, just use the device your provider supplies with the connection.

Originally posted by uuallan
A 36xx would be very much overkill for what you are doing, look at a Cisco 2621 instead.

A router can only route between netblocks. So, what you are proposing will work fine for your Cable modem, but you will not be able to turn off NAT when you get your DSL line, becase your ADSL modem will be acting like a router. So, even though you will have a dedicated IP Address, because you are going through two routers, you will need two netblocks.

You will be able to stop using NAT when you get a T1+.

You can get an ADSL WIC for the 26xx or 36xx series...

If that doesn't work, if he could get his DSL modem to bridge or use a /30 out of RFC1918 space for the netblock between the ethernet on the DSL modem and the ethernet on the router, he could use it then.

Im not too sure if it does.

Currently my cable modem provider uses the MAC address of the Modem and assigns as dynamic IP address to it.

But I am unsure about the ADSL modem.

Like I have said in my previous posts, I will be getting the 36xx router very very cheap and will be good for future expansion.

I have just found out that my friend does have a modem built into his ADSL modem, and apparently you cannot get ADSL modems with 10base-T ports in this country yet (UK).

This blows everything down the tube !

But for the mean time, will my current Cable modem with dynamic IP assigned to the modem work with the 36xx router with 2 interfaces, would I connect it up like in the previous post ?

I also want to get a Cisco router for Cisco Certification study.
(I want to get a CCNA/CCIE :)

Hi manmythlgnd

I didnt realise you can get an ADSL WIC card....this would be a good investment, could I run 8 static IP's using this and the 36xx router with a noNAT configuration ??

I didnt understand what you mean by /30 and bridging....please explain further !

Ta

Originally posted by richardparry
Hi manmythlgnd

I didnt realise you can get an ADSL WIC card....this would be a good investment, could I run 8 static IP's using this and the 36xx router with a noNAT configuration ??

I didnt understand what you mean by /30 and bridging....please explain further !

Ta

Since in your first post you say you are looking at a 3620 with two ethernet ports, I assume you are looking at one with an NM-2E2W or NM-2FE2W. In which case you can just pop a WIC-1ADSL in there. Although, as pointed out earlier, a 36xx series router seems to be a bit of overkill; the WIC-1ADSL will work in a 2600 or 1700 series router as well. If this solution works for you, then don't worry about using a /30 for your other interfaces or bridging.

A /30 is CIDR notation for a netblock that consists of only two usable IP addresses. One for each side of the link. I mentioned using a /30 from RFC1918 space which is the private IP space in 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. If your router does not do any layer 3 packet forwarding or can be used as a bridge, then all you need is a router with two ethernet interfaces. A bridge effectively connects two separate ethernet segments.

Hi !

Thanks for the reply !

I am probably going look for a 2620 or something now then, if your opinion is correct.

Also, I cannot find the WIC-1ADSL anywhere, any idea where I would purchase this card ??

What is the ADSL card ?? A ethernet port or the actual modem ?

Ta !

Get a 2600 or even a 1700 to be on the low cost side....I have a 2610 in my Georgia office that has a T1 WIC that a backup DNS server runs on. That router also has a ADSL WIC for local users to get on the net. So in your setup you should just get a 2600 and a ADSL card you'll be set till your ready to move to T1 and thats as simple as pluging in a T1 card and configuring.

the dsl card is the modem itself, the phone line plugs directly into the card.

Great !

How much are the ADSL WIC cards ? I havent seen them anywhere.....

Ta:D

Originally posted by richardparry
Great !

How much are the ADSL WIC cards ? I havent seen them anywhere.....

Ta:D

I don't know... never had to buy one. They are really new, and I do not think there is much of a secondary market for them.

Here's an FAQ from cisco: http://www.cisco.com/warp/public/cc/pd/rt/1700/prodlit/ads17_ds.htm

The part number is WIC-1ADSL... ask your local cisco reseller. If you can't pull at least 30-33% off list price, run.

You can get a cisco 2500 series for 200 on ebay :)

as for the ccie, you might wanna wait a few years

I found the WIC-1ADSL on a website for £450....I live in the UK.

I think I shall wait a little while until the price drops ???

--

Regarding davidb's comments, why should I wait ? Is there a high in CCIE students at the moment ??

Ta