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Using Dual Routers Inside DSL Modem and Switch - Will it Work?

Posted on 2004-08-06
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Last Modified: 2013-12-14
Hi experts.

I am new to DSL after working predominantly with Cable and need some insight.  I currently have a Cisco SOHO Router behind a Speedstream 5500 DSL modem with a Dynamic IP using PPPoE.   I need to switch to static IP addressing from my ISP (SBC) and install a second router (Linksys BEFSR41) behind the modem.  My question is this:  If I install a switch behind the modem and then assign static IP's to each of the routers behind the switch, will my DSL connection still be functional on both routers?   I read in one discussion where some DSL modems are configured to recognize only one MAC address of devices connected to them.

Here is a diagram of what I am trying to do:

                                ------->cisco SOHO (static IP)----->PC1
SS5500----->switch--|
                                ------->linksys SR41 (static IP)---->PC2
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Question by:stephenm93
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Expert Comment

by:grblades
ID: 11737551
Hi stephenm93,
If you switch to static IP addresses and are given at least two IP addresses by your ISP then it will work fine.
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Author Comment

by:stephenm93
ID: 11739435
So, no modem issues that you have heard of regarding MAC addresses and the SpeedStream modem?

Just want to make sure and head off any potential disasters like having to switch modems etc.

Thanks for the input.
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Accepted Solution

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grblades earned 1400 total points
ID: 11739805
The only issues occur when the ISP gives you a single IP address only and you are using one router and then switch to another router. The cable modem can learn the MAC address of the router it was speaking to a refuse to talk to the new one until it is rebooted.
You wont have any problems with your setup as long as your ISP issues at least two static IP addresses and the cable modem can handle this.
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