Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1402
  • Last Modified:

Best setup for home network with wired adsl ethernet modem and wireless router

Hello
I am wondering what is the best setup for my hardware - I have a ADDON ARM8100 ethernet adsl modem and a 3COM OfficeConnect Wireless 11g Cable/DSL gateway.  I am wondering what is the optimal configuration - like should I make the ARM8100 the DHCP server - or should I let the 3COM be the DHCP server and give the ARM8100 a static address - should I configure the hardware so they are all on the same lan say all on 192.168.1.x or give ARM8100 a 10.0.0.1 ip address and give the 3COM wireless the 192.168.1.x range.  I am just looking for the optimal setup.
Thanks,
0
modish
Asked:
modish
  • 10
  • 9
1 Solution
 
Rob WilliamsCommented:
If both of these units are modems as you suggested, and you have only 1 public Internet IP address, which is the norm for a residential account, you can only use one or the other unit. If you do have 2 public IP's or internet connections the only advantage to using both would be if you want to separate the devices on the two networks.
0
 
modishAuthor Commented:
No - they are not both modems - just the ARM8100 - ( at least - for my configuration I need an adsl ( analogue) modem which the ARM8100 is - the wireless is just for local ( lan access)
0
 
Rob WilliamsCommented:
Best way to do that then is to make the 3Com an access point allowing a single DHCP server (the ARM8100) and all devices on the same LAN, using the same subnet/IP scheme.
To do so.
-On the 3com  disable all WAN configurations
-disable DHCP
-assign it a static IP address in the same subnet as the ARM8100. Make sure it does not conflict with any other static IP's, or the DHCP range of the ARM8100
-plug a cable from of the LAN ports (not WAN) of the 3Com into a LAN port on the ARM8100
-configure the 3Com wireless as normal

This allows wireless users to connect to the 3Com but request IP's from the ARM8100 as all wired computers will and all computers will be on the same network/subnet and can share access and resources.

This will only work if the 3Com is a standard router, if a "Cable/DSL gateway" as you mentioned earlier, I do not believe it will work. It would depend on the 3Com configuration.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
modishAuthor Commented:
hi all,
The reason I ask the question is that recently the ethernet modem I had died - and so I got the ARM8100 - the  old configuration I had was the wireless 3COM had 192.168.1.1 ip and was the DHCP server. - the adsl modem was at 10.0.0.1 and connected to the internet.  The 3COM 11g connected to the adsl modem through the WAN port --- I was just wondering if this was the best kind of setup .. Performance wise etc. - all my home PCs connect wirelessly at present.  Rob you have suggested a different setup == why would that be better... The 3Com is a Cable/DSL gateway 3RWE554G72.      I will give this a  go - if this is better
0
 
Rob WilliamsCommented:
I cannot seem to find any information on the 3RWE554G72 unit but....
The modem device has to be connected to the Internet, in this case it is your ARM8100. Then you have 3 choices:
1) connect the LAN port of the ARM8100 to the WAN port of the #COM
Doing so means the 3COM will get a WAN IP address from the ARM8100 using DHCP, and the computers will get an IP address from the 3COM. The subnets each uses do not matter so long as they are different. So the ARM8100 could use 192.168.1.x and the 3COM (LAN side) could use 192.168.2.x, 10.0.0.x or what ever you like. This arrangement works fine, but if ever you were to set up an incoming service such as remote access you have to set up port forwarding on the ARM8100 to the 3COM and then from the 3COM to the network PC. This configuration of double NATing (Network Address Translation) will not work for some services such as VPN's and a few games.
2) as described above (earlier post) where the 3COM becomes an access point an all devices will receive DHCP addresses from the ARM8100
3) I could only find an abbreviated manual for the ARM8100, and the option wasn't in that, but in some units that are combined routers and modems you have the option of putting them in bridge mode. Bridge mode effectively makes the unit a basic modem passing all traffic directly to the router (the COM) and switching off DHCP on the ARM8100. The WAN page of the 3COM then has to be configured to connect to the ISP.

I recommended option 2 ,as 3 and 3 gave you the most flexibility, and I didn't see option 3 as being available in the abbreviated manual.
0
 
modishAuthor Commented:
RobWill,
Thanks for this,
The specs for the 3COM are here http://www.3com.com/products/en_US/detail.jsp?tab=features&pathtype=purchase&sku=3CRWE554G72
The ARM8100 does allow Bridge filtering - Is this the same thing as the bridge mode?
It allows you to do the following
The Advanced section lets you configure advanced features like RIP, Firewall, NAT, UPnP, IGMP, Bridge Filters, and LAN clients.
 
UPnP  Configure UPnP for different connections.  
 
SNMP  Configure SNMP Management.  
 
IP QoS  Configure IP Quality of Service for different connections.  
 
Port Forwarding  Configure Firewall and NAT pass-through to your hosted applications.  
 
IP Filters  Configure Firewall to block your LAN PCs from accessing the Internet.  
 
LAN Clients  Configure LAN Clients.  
 
LAN Isolation  Disable traffic between LANs.  
 
Bridge Filters  Select to setup Bridge Filters.  
 
Multicast  Configure Multicast pass-through for different connections.  
 
Static Routing  Configure Static routes.  
 
Dynamic Routing  Configure RIP.  
 
Access Control  Configure access control list.  
 
and under IP filtering and Port Forwarding there are predefined rules for games,vpn etc. - I really haven't a clue about any of that .
  Games
  VPN
  Audio/Video
  Apps
  Servers
  User
So maybe I should stick with option 2 - as you recommended in your first comment.
0
 
Rob WilliamsCommented:
I must be missing something here :-) Saturday, maybe my brain is off for the day. According to the link you provided, the 3COM, which is a nice unit by the way, is a DSL modem, a router, and a wireless unit. I don't understand why you need the ARM8100 at all. Connect the DSL phone line to the 3COM, configure it and you are all set, for wired and wireless users.

If you really want to look at other options #1 is out, there is no WAN port on the 3COM, and 2 should work, but I don't know of the intended functionality where it is a combined modem unit, but I don't see the point.
0
 
modishAuthor Commented:
Hi RobWill,
I don't think the 3Com is an analogue modem ( it works I think if you have cable broadband -). Annex A is the one I need ( I think it is referred to. but it does not have a RJ11 port ( Wan port is RJ45) =- I think I have the right numbers - Does this make sense - or am I the one who is missing something?
0
 
modishAuthor Commented:
I also just spotted this in one of the bullet points in the link about the 3COm I gave you
-Works with either a cable or a DSL modem for configuration flexibility
0
 
modishAuthor Commented:
The ARM8100 can also be setup as bridge - it in the network setup - choice of PPPOE,PPPOA,DHCP,Bridge... I found a manual.. :-) - so does it make sense to set it up as a bridge..
0
 
Rob WilliamsCommented:
OK I was missing something. :-)
I followed a link from that site to:
http://support.3com.com/infodeli/tools/hubs/off-con/pdf/dua0055-4aaa01rev01.pdf
They refer to it as a DSL gateway, but it doesn't really have DSL functions. I think their terminology means gateway to your DSL. Thus, Options 1 and 2 are fine and I don't have enough information to confirm 3. I was going by:
http://www.addon-tech.com/Manual/ARM8100/ARM8100.pdf
which is pretty vague. However, usually where you have the NAT configuration there is a Bridge or Bridge RFC... option. I don't know if Bridge filters would be similar. Option #2 is good though.

0
 
Rob WilliamsCommented:
>>"The ARM8100 can also be setup as bridge - it in the network setup - choice of PPPOE,PPPOA,DHCP,Bridge... I found a manual.. :-) - so does it make sense to set it up as a bridge.."
Bingo, that is it.
0
 
modishAuthor Commented:
Thanks RobWill,
Will - have to logoff now to set  this up!
0
 
modishAuthor Commented:
Ok - have set it up - one question RobWill - made the ARM8100 get an IP address from 3COM box - should I do this - or give it a static IP address.  
Thanks  again
0
 
Rob WilliamsCommented:
>>"made the ARM8100 get an IP address from 3COM box - should I do this "
Based on above I don't believe you can't do this, or do you mean set it up for the 3COM to get an address from the ARM8100? If so that is fine or you can use static, both are quite acceptable.

Which option did you go with?
0
 
modishAuthor Commented:
Hi Rob,
I made the ARM8100 a bridge - and if I plug in from LAN on 3COM to LAN on ARM8100 - I get an IP address from 3COM for ARM8100 ( for management purposes - of the ARM8100 )
0
 
Rob WilliamsCommented:
Interesting, I didn't think it would pick up an IP from the 3COM. However if it does, that is fine.

Is everything working OK now?
Thanks for the points by the way.
--Rob
0
 
modishAuthor Commented:
Yeah - everything seems to be great - Thanks again for all the help.
0
 
Rob WilliamsCommented:
Very welcome, glad to hear.
--Rob
0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

  • 10
  • 9
Tackle projects and never again get stuck behind a technical roadblock.
Join Now