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2 Cisco routers on the same internet line

Posted on 2012-08-24
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Hey there experts.  I have a project where I have to install an additional Cisco router within my network that already has one.  Wondering what the best approach is to this.

Should I just place a switch on the internet line-in, and then simply branch off to each router.  Each router would then be configured with its own public IP but both would have the same gateway?  Doesn't a DMZ have to happen somewhere?

Or is there a better solution?   Thanks a million!
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Question by:kevingibbs1
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by:djcanter
ID: 38330796
Yes a switch would work. What i do rather than add a piece of hardware is configure a vlan with 3 ports  for the WAN links on my main switch.

Both routers would have public IPs  in the same address space hence the same gateway.

I am assuming the networks behind the routers are intended to be isolated from each other.

If not can you describe your topology and reason for additional router.
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Author Comment

by:kevingibbs1
ID: 38330829
Unfortunately, that is not an option as this vendor is requiring they use their own router.  I'm not crazy about it, but I don't have a choice.  OK, so a simple switch...split to each router and that's it?  Seems too simple.  No special rules or configs to make this work.  Having the same gateway on two routers won't cause any problems?
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djcanter earned 2000 total points
ID: 38330842
It is that easy. 1 switch with 3 cables connected, 1 to internet device, 1 to each router.
Unless... are you doing pppoe on your original router or is the wan just a static ip?

As for the gateway, all the pcs on the lan connect to the same gateway. Same idea.
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Author Comment

by:kevingibbs1
ID: 38330856
WAN is a static IP.  I have a block.  My own router has its own public, I was going to assign another public to this other router and give them both the same gateway.  No problems there??
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Expert Comment

by:djcanter
ID: 38330865
Nope. Thats exactly what has to happen.
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Author Comment

by:kevingibbs1
ID: 38330878
Excellent, thanks man!
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Author Closing Comment

by:kevingibbs1
ID: 38330881
Super responsive and helpful!
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