Network expansion/Class c subnet running out
Hello,
We have a WAN with more 40 branch offices. Our main problem is the HQ office where our class c or /24 ip we had has runout and we now need to expand. we have ip range 192.168.1.0/24. we have 20 DB servers and a DHCP Server. In small summary diagram our network is like below
DMZ
||
Internet===FW==LAN====
||
ROUTER
||
WAN
The problem is how we increase the LAN segment. we are considering number of options and they all have pros and cons and I wanted to some experts views;
1. We are considering just increasing the LAN segment to a class B, but we fear that the broadcast domain will grow too big on the same segment where the application servers are sitting. We are also reluctant to change IP settings on some application servers which have misbehaved in the past when you change the IP address setting.
2. Or We would like to introduce a bigger router before the Firewall and break the LAN in different segments, but need to be sure all the LAN segments applications will work fine
3. Another option is to do VLANs since some switches are managed ones but some are not. Am also not sure this is a good option and am not too sure if VLANs are really that good and how the configuration is done. Apart frombeinga cheaper options are the VLANs better than just using routers.
My question is what are the other options available, or which of the above would best suit our scenario. Any piece of advice will be highly appreciated.
cdd
We have a WAN with more 40 branch offices. Our main problem is the HQ office where our class c or /24 ip we had has runout and we now need to expand. we have ip range 192.168.1.0/24. we have 20 DB servers and a DHCP Server. In small summary diagram our network is like below
DMZ
||
Internet===FW==LAN====
||
ROUTER
||
WAN
The problem is how we increase the LAN segment. we are considering number of options and they all have pros and cons and I wanted to some experts views;
1. We are considering just increasing the LAN segment to a class B, but we fear that the broadcast domain will grow too big on the same segment where the application servers are sitting. We are also reluctant to change IP settings on some application servers which have misbehaved in the past when you change the IP address setting.
2. Or We would like to introduce a bigger router before the Firewall and break the LAN in different segments, but need to be sure all the LAN segments applications will work fine
3. Another option is to do VLANs since some switches are managed ones but some are not. Am also not sure this is a good option and am not too sure if VLANs are really that good and how the configuration is done. Apart frombeinga cheaper options are the VLANs better than just using routers.
My question is what are the other options available, or which of the above would best suit our scenario. Any piece of advice will be highly appreciated.
cdd
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Qlemo
You could try ro change the subnet mask only, to /23 or /22. That way you would not have to mess with the IP address of existing servers.
ASKER
Do u know a good how-to for creating VLANs, need to understand them better especially how to configure them. Where do the VLANs beat using physical routers. If I introduce another /24 on another router interface, do I introduce another DHCP server since am not sure of DHCP on the intranet or routed network. can u configure a workstation to get a DHCP IP from another subnet, if so how?
if we introduce a /23, my worry is the size of the broadcast domain LAN where the application servers are sitting, also we still have to tinker with the server ip settings to change the mask.
Any comments please.
cdd
if we introduce a /23, my worry is the size of the broadcast domain LAN where the application servers are sitting, also we still have to tinker with the server ip settings to change the mask.
Any comments please.
cdd
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ASKER
No I did not perform a broadcast analysis. Is there a tool to do that? I just feel more than 400 hosts on one LAN where the servers are sitting is not such a great idea. I prefer to split them but then don't want to run another DHCP server or to run it off the router
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