BurntCricket
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clubs: | reply to RouterHelp
Re: [Guide] Router Mode Setup
Okay, the $2 question ... Why would someone want to do this? |
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RouterHelp
@rr.com
| So that they can have multiple networks on the same LAN. I don't think in a business capacity, you would want to have a lot of broadcast traffic because there's over thousands of machines connected to the same LAN. I mostly wrote this to help people who have no idea what router mode actually does because I see the question come up a lot and a lot of people just think it's used to turn a router into a switch or access point when it has nothing to do with doing that at all. |
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RouterHelp
@rr.com
| reply to BurntCricket
Oh not to forget mentioning that if you take out the steps of doing the static route and you don't change the operating mode to router, you could do a double NAT setup and have the second network completely invisible to the other first network. That might be useful in some scenarios where people on one network shouldn't be able to access the other.  |
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dbmaven
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3 edits | This is timely for me - because I need to set something like this up.
Let me see if I've got it right.
Router 1: DHCP from ISP
Static LAN side address of 192.168.3.1/255.255.255.0
Set LAN DHCP to serve addresses only in a small range, say 192.168.3.50 - 59
Set a static IP of 192.168.3.25 (example) for a VOIP ATA.
Router 2: Static WAN IP of 192.168.3.254 (the last available address for router 1), mask of 255.255.255.0
Question: in specifying the WAN side, do the DNS server entries need to be set ? And the DEFAULT GATEWAY should be the LAN side address of ROUTER 1?
Static LAN side address of 192.168.2.2/255.255.255.0
Serving DHCP addresses in 192.168.2.50-99, possible static IPs for connected devices in the 192.168.2.200 range.
Connect LAN port Router 1 to WAN port router 2.
Specify STATIC ROUTE in Router 1 setup
DESTINATION LAN IP - would be the LAN side of Router 2 - in my list above it would be 192.168.2.2/255.255.255.0
DEFAULT GATEWAY would be the WAN side address of Router 2 - in my list above it would be 192.168.3.254
Thanks in advance for any corrections !
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jza80
join:2005-10-29
Sacramento, CA
1 edit | reply to RouterHelp
said by RouterHelp :
So that they can have multiple networks on the same LAN. I don't think in a business capacity, you would want to have a lot of broadcast traffic because there's over thousands of machines connected to the same LAN. In a business or enterprise environment, you'd use layer 2 managed or layer 3 switches.
VLANs would be setup on a switch(es) to divide/segment the entire network into smaller networks or subnets. In the case of a layer 2 switch, the VLANs are then trunked to a router or layer 3 switch for inter-vlan routing. With a layer 3 switch, inter-vlan routing can be done on the switch as routing happens at layer 3 (network layer of OSI model).
Theres other reasons to split up a network besides broadcast traffic, but broadcast traffic is one reason. |
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jza80
join:2005-10-29
Sacramento, CA
1 edit | reply to dbmaven
said by dbmaven  :Question: in specifying the WAN side, do the DNS server entries need to be set ? And the DEFAULT GATEWAY should be the LAN side address of ROUTER 1? Specify DNS and gateway as the LAN side IP of router 1. 192.168.3.1 in your case.
quote:
Specify STATIC ROUTE in Router 1 setup
DESTINATION LAN IP - would be the LAN side of Router 2 - in my list above it would be 192.168.2.2/255.255.255.0
DEFAULT GATEWAY would be the WAN side address of Router 2 - in my list above it would be 192.168.3.254
Static routes are specified as: destination mask gateway.
For the destination, you want to use the network address not the IP address of the router. The network address for 192.168.2.2 / 255.255.255.0 is 192.168.2.0/24 (192.168.2.0 / 255.255.255.0)
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With 192.168.2.0/24 you have:
192.168.2.0 = network address
192.168.2.1 = first usable IP address
192.168.2.254 = last usable IP address
192.168.2.255 = broadcast address
Network and broadcast address are not usable.
So static route for router 1 to router 2 = 192.168.2.0 255.255.255.0 192.168.3.254 |
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dbmaven
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clubs: | Got it.
Thank you very much ! |
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RouterHelper
@rr.com
| reply to dbmaven
said by dbmaven :Question: in specifying the WAN side, do the DNS server entries need to be set ? And the DEFAULT GATEWAY should be the LAN side address of ROUTER 1? Just one. If you just want it to use whatever DNS is set on the router connected to the modem then set it to the LAN IP of the first router and it will just use those. If the DNS on the first router changes, you don't have to make any changes on the other routers DNS settings as long as the LAN IP of the first router doesn't change. You don't have to do it this way though, you could use whatever DNS you like on the routers after the first just like you can on each individual computer connected to either router. |
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dbmaven
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| As they say - timing is everything - plus a good use of the search function 
This was exactly what I was looking for.
Thanks to all for the detailed help and ideas !
--
The inherent vice of capitalism is the unequal sharing of the blessings. The inherent blessing of socialism is the equal sharing of misery.
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