Ip Address Reservation - Suggestion

sparkus · Mar 19, 2014

Hello there, I need your help for reserving IP address to some devices. Here is the scenario,

Internet->Firewall->DB Router->Server->Switch3 (from here, it splits to two other switches, i.e switch 2 and switch 1 for left and right side of the building)

now, from switch2 it connects 6 routers and 3 access points and same for switch3..

1. Each Router will have only 2 clients. (both internet & intranet access)
2. Each Access Point will have 40 to 120 clients. (only intranet access)

dhcp can be done either at server or on each devices.. (suggest me which is best)

so how shall i assign ip address to all these devices...

im planning to seperate it as a two network for left and right side..

please help me asap... i need a serious suggestion....

thanks in advance...

RaDiKaL_ · Mar 19, 2014

DHCP on each AP would alleviate congestion in your overall network, however you might lose some control regarding logging that a DHCP ran from the server would give, so you'll have to choose between performance or better security (log wise).

If I understand correctly you'll have two networks, so say switch 2 would have one network and switch 1 another one?

If that's the case it could be something like this:

Switch 1 Network: 192.168.10.0 /24
IP addresses:
-Routers: 192.168.10.240 to 192.167.10.246
-APs: 192.168.10.249 to 192.168.10.252
-Clients (DHCP Range): 192.168.10.1 to 192.168.10.128 or beyond.

Thus leaving a few free IPs if one day you decide to add more APs/routers to said network

same would be for 2nd network only instead of 192.168.10.0/24 it would be 192.168.20.0/24.

Of course that's an example, you'll have to see which IP ranges you have available to use in your network but that's and idea.

sparkus · Mar 19, 2014

RaDiKaL_ :

DHCP on each AP would alleviate congestion in your overall network, however you might lose some control regarding logging that a DHCP ran from the server would give, so you'll have to choose between performance or better security (log wise).

If I understand correctly you'll have two networks, so say switch 2 would have one network and switch 1 another one?

If that's the case it could be something like this:

Switch 1 Network: 192.168.10.0 /24
IP addresses:
-Routers: 192.168.10.240 to 192.167.10.246
-APs: 192.168.10.249 to 192.168.10.252
-Clients (DHCP Range): 192.168.10.1 to 192.168.10.128 or beyond.

Thus leaving a few free IPs if one day you decide to add more APs/routers to said network

same would be for 2nd network only instead of 192.168.10.0/24 it would be 192.168.20.0/24.

Of course that's an example, you'll have to see which IP ranges you have available to use in your network but that's and idea.

thank you so much radikal... i got an idea now...

so how should we give for firewall, db router and server?? any idea...

RaDiKaL_ · Mar 19, 2014

Server could have this IP arrangement (assuming VLANs are in use so you can have those 2 networks connected to 1xNIC in your server):

192.168.10.254 for SW1 network. (NIC 1).
192.168.20.254 for SW2 network. (NIC 1).
172.16.0.2 /30 for db router<->Server network (NIC 2).

Router:
172.16.0.1 /30 for db router<->Server
172.16.0.6 /30 for db router<->Firewall

Firewall:
172.16.0.5 for Firewall <-> db router
Public IP to Internet

that again an example, you could use another range, another subnet mask etc. also this is assuming firewall is doing NAT.

sparkus · Mar 19, 2014

thanks a lot radikal..... this will definitely help me....

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