Are you running tehse IPs as your internal ip addresses (private) or on the outside (public)?
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Run out of IPs on a Class C, need more with out total Range change.
I run a server environment and have run out of IPs in my Class C range 196.25.0.*, i need to add more but i do not want to chage the range. I also do not have a router. or a Switch to handle this. Budget constraints! Can i do it with software in scopes and what server config changes are needed. Too many suppliers to come out and redo custom software setups?
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Answers
If you provide a subnet mask I can help you. We can use CIDR (supernetting) to change the subnet and provide you with more ip addresses but we'll have to change the subnet mask.
For instance, lets say you have a 196.25.0.0 network with a class C subnet mask (255.255.255.0) which only gives you a total of 252 usable IPs. If you change the subnet mask to 255.255.254.0 it will give you 510 usable IPs addresses and the usable range is from 196.25.0.1 to 196.25.1.254
http://www.subnet-calculat
Without knowing the IP address of your DNS server, check your DHCP pool settings. Make sure DNS is properly set.
Without knowing the actual mask you have used and assuming you have followed the instructions above check all of the following.
ADSL router
Check IP address and mask is 196.25.0.10 mask 255.255.255.254
DNS server
Check that the IP address is in the range 196.25.0.0 - 196.25.1.254 and the mask is 255.255.255.254
DHCP server
Set the scope to 196.25.0.0 255.255.255.254
Set Default gateway address to 196.25.0.10
Set DNS server to 196.25.0.x (whatever you the IP to in the above step)
That completes your basic setup.
If your using the mask 255.255.254.0 all clients will use the same routes. You didn't mention the ISA server before. You will need to therefore set your DHCP clients default route to point to the IP address of the ISA server, change the MASK of the ISA server to the one above, and change the old rule sets on ISA which are using 196.25.0.0 255.255.255.0 to use 255.255.254.0.
Please clear something up for me..
as above from
<<Without knowing the actual mask you have used and assuming you have followed the instructions above check all of the following.
ADSL router
Check IP address and mask is 196.25.0.10 mask 255.255.255.254
DNS server
Check that the IP address is in the range 196.25.0.0 - 196.25.1.254 and the mask is 255.255.255.254
DHCP server
Set the scope to 196.25.0.0 255.255.255.254
Set Default gateway address to 196.25.0.10
Set DNS server to 196.25.0.x (whatever you the IP to in the above step)
255.255.255.254 in invalid so i assume its 255.255.254.0 from ADDing rules???
the clients receive a new IP from dhcp 196.25.0.0 sub 255.255.254.0 DNS is with both ranges too.
I have a linksys router and i am not able to cahgne the sub to 255.255.254.0 only 255.255.255.0, 255.255.255.128, 255.255.255.192, 255.255.255.224 and so on... so i get serviced by the DHCP and DNS but not the router set as default gateway 196.25.0.2 255.255.255.0....
I am sure ISA will be able to handle this translation thru a NAT but the ADSL router on on the ISA Box does not..? :-(
OK so this is a limitation on your router. If thats the case then you could do a double NAT via the ISA server as you have suggested. Set up NAT on the ISA server and forward all your outbound traffic to the router from the NAT'd IP address which you would need to have sit within the range196.25.0.0 196.25.0.254 so it can communicate with the linksys.
I'd say you have a device in there that is limited to a 24 bit subnet. The changes should have worked without issues.
It seems to me that you haven't actually changed anything so its hard to tell. You started with a subnet 255.255.255.0 and thats what you still have so in fact you have me a little confused right now.
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by: Net_WorkerPosted on 2008-08-13 at 04:49:17ID: 22220843
Your going to need to provide a bit more info because you scenario doesn't exactly make sense. If you don't have a router then you have no default gateway and therefore your existing class c is effectively useless.
I am assuming your saying you don't have another router. But that isn't a problem. You purchase a new block of IP's from your ISP and request if possible that it comes from the same range as your existing 196.25.x.x. Your ISP also needs to route that new subnet via the gateway address of the existing subnet. You then add a route into your existing router to forward all traffic via the existing default gateway.