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Routing question

I have 2 networks  10.1.1.0 and 10.1.2.0, both these have a dedicated internet connection.  I need to route traffic between these 2 networks so that I can access hosts on each others network.
Net A
Network: 10.1.1.0
Gateway: 10.1.1.1

Net B
Network: 10.1.2.0
Gateway: 10.1.2.1

Also, do I need another router between NetA and NetB? Also what routes do I need to add on each of the networks gateway if any?

Thx
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ddman123
Asked:
ddman123
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1 Solution
 
Jody LemoineNetwork ArchitectCommented:
Depending on what kind of routers you are using to connect to the Internet, you may be able to connect the two with existing equipment.  If you can give each router a secondary IP address on the other's network, you'll be covered.  If not, a third router will do the trick, but you'll need to set static IP addresses for the other network on each of the existing routers pointing to the IP addresses of the new one.
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memo_tntCommented:
Hi
you need to create tunnel connection between them as:

interface Tunnel1
 description Tunnel to NetB
 ip address 172.16.1.3 255.255.255.252
 tunnel source ROUter A-Real.IP
 tunnel destination ROUter B-Real.IP
 tunnel mode nos
 tunnel key 2

ip route 10.1.1.0 subnetmask tunnel1
 

interface Tunnel1
 description Tunnel to NetA
 ip address 172.16.1.4 255.255.255.252
 no ip directed-broadcast
 tunnel source ROUter B-Real.IP
 tunnel destination ROUter A-Real.IP
 tunnel mode nos
 tunnel key 2
 tunnel path-mtu-discovery

ip route  10.1.2.0 subnetmask tunnel1
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Jody LemoineNetwork ArchitectCommented:
Okay... I missed something there.  Are you wanting to access these routers via their Internet connections or are they in the same physical location and you just connect them up via their LAN interfaces?
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ddman123Author Commented:
These routers are in the same physical location.  Unforunately, I do not have access to those routers as they are maitnained by the ISP.
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Jody LemoineNetwork ArchitectCommented:
That makes it a bit more complicated.  You'll need to find a way to route between them while preserving the default router so that each can still get out of their internet connection.  If you can persuade the ISP to add a static route to each of the existing routers, you can add a third router and do this:

New Router:

Port 1: 10.1.1.2/24
Port 2: 10.1.2.2/24

ISP Router 1:

Static route 10.1.2.2/24 via 10.1.1.2

ISP Router 2:

Static route 10.1.1.2/24 via 10.1.2.2

When packets going to the ISP router are destined for the other network, the static route will redirect them to your router, which will pass them to the other network.
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memo_tntCommented:
Hi
hence your ISP will do the changes then
I recommend to ask your ISP to do the static routes without any extra routers ..


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Jody LemoineNetwork ArchitectCommented:
If you want to have this done without a third router, you'll also need to ask the ISP to add the following secondary addresses to their routers and then connect them together with a crossover cable.

ISP Router 1 (10.1.1.1) needs a secondary address of 10.1.2.2 added to it.
ISP Router 1 (10.1.2.1) needs a secondary address of 10.1.1.2 added to it.

Not all ISP-deployed routers can do secondary IPs, so you may yet need to fall back on the third router idea.  If the routers are providing DHCP, this will bleed over to the other network as well, so it's not an ideal solution.

The .2 is arbitrary.  You can assign whatever IP address you want, so long as it is on the other router's network.

Personally, I would go with the third router approach.
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memo_tntCommented:
Hi jodylemoine:

once he has both connection from the same ISP then it's possible to make the routes between the two networks without any extra routers or any extra assigning IPS

i already worked in ISP before and i did this many times for customers

most probably both connection on same core network
so they add static route between both networks
so just he needs to contact his ISP and ask them to do all this


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Jody LemoineNetwork ArchitectCommented:
Hey memo_tnt.  This would work too, but will require that all traffic go to the ISP and back and that tunnel interfaces be configured on the ISP routers.  At this point, we don't know what kind of routers the ISP has installed (they may be SMC home gateways with very little advanced functionality for all we know) and may not be capable of bypassing their NAT firewalls via tunnels.
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memo_tntCommented:
Hi
I agree with if they on different ISPs
but in this case it doesn't matter the kind of his routes
once the default route is set on both sides and their gateways is the same ISP

then all what ISP need to do is routing LAN A to route B and LAN B to router A from ISP side




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Jody LemoineNetwork ArchitectCommented:
It'll still be much slower because the traffic will be traversing the link to the ISP and back rather than just going between LAN links, but I agree that it would involve less on-site trickery.
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ddman123Author Commented:
One iSP Router is an Actiontec MI424-WR  and the other one is a Cisco IAD 2400 also both ISP's are different.

Thx
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memo_tntCommented:
ok, then you need a third party device (router) to do your routing issues between the two networks as per jodylemoine: post above

New Router:

Port 1: 10.1.1.2/24
Port 2: 10.1.2.2/24

ISP Router 1:

Static route 10.1.2.2/24 via 10.1.1.2

ISP Router 2:

Static route 10.1.1.2/24 via 10.1.2.2
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