|
|
|
|
|
Home :
Routers and Access Points :
Wired Routers :
what happens if i run out of dchp?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Re: what happens if i run out of dchp?
|
|
InfoSec
Newbie
Posts: 1
Registered: 10-16-2009
Message 4 of 12
Viewed 22,251 times
|
|
|
The short answer is: If you have that many computers using this device simultaneously you should probably be using some beefier hardware  .
The router will only allow you to use at most a class C network (256 addresses). 192.168.1.0 is generally reserved as the "network name". 192.168.1.1 is reserved for the gateway IP address. 192.168.1.255 is the broadcast address. This leaves you you with 253 IP addresses to lease via DHCP.
I'm guessing you won't ever have 253 computers on the network simultaneously, so this shouldn't be an issue. It is far more likely that you might have 253 different computers over a period of time. This is where your DHCP lease time will come into play. When a computer is leased an IP address by a DHCP server, it is leased that IP for a certain amount of time. This is called your DHCP lease time, and can be configured in the web interface. Hence, as computers leave the network, the leases for their IP addresses will expire. When a lease expires, that IP address returns to the DHCP pool and can be leased to a different computer. When you start running out of addresses, your subnet is said to be oversubscribed. If your DHCP lease is very high, lowering it might fix the problem (2 hours should be reasonable if you're in an environment where many people come and go). Otherwise, you'll need to redesign your network.
-- Greg
|
|
|
|
10-16-2009 03:34 PM
|
|
|
|
|
|
Re: what happens if i run out of dchp?
|
|
sturlalv
Newbie
Posts: 1
Registered: 11-04-2009
Message 5 of 12
Viewed 19,766 times
|
|
|
I work in an open office environment and we have both a wired and a wireless network. Our servers are located off the premises and we connect through rdp. We have two printers on site who are plugged into our router (until recently an SMC device, but as this died the other day I bought a wrt160n to replace it). The printers serve both the LAN and the off-site servers and have static IP addresses (192.168.2.239 and 243, and they are for some reason set in stone...). Basic setup of the wrt160n router was a breeze, and we had our WLAN up in no time. However we were uable to print, as the printers were outside the IP range given by the router. When I tried to change the gateway IP to 192.168.2.1 all the backed up print jobs printed, but the WLAN lost connectivity to the internet. I was also unable to log on to the router admin interface to reset the IP to 1.1. Any good tips on how I may have the best of both worlds - both a WLAN with connectivity and be able to print? Best regards Sturlalv
|
|
|
|
11-04-2009 02:36 PM
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Re: what happens if i run out of dchp?
|
|
Polorboy
Newbie
Posts: 1
Registered: 11-30-2009
Message 10 of 12
Viewed 15,500 times
|
|
|
If you are trying to run your entire business network off of a Linksys Wireless router you should seriously rethink your network plan. First off, your probably open to dozens of security threats to your network, especially if your using it out of the box without changing much information. Those wireless routers are not designed to handle that kind of traffic. There is no way to segregate traffic into vlans of any sort. The previous person who is CCNA certifified should know this and should have said something similar. If your company does not have an IT staff, you should also seriously consider hiring one or having an IT consulting/management firm handle your network. These products are designed for home use, and that is where it ends. Cisco makes an entire line of networking equipment designed for everything from small businesses to large multi-national coorporations. I admit, I have not read this entire post but I can tell you from what I have read, your servers and printers must have a static IP address if you want them to work. They should also be on their own subnet if possible and you should have routers forwarding traffic securly between these networks. Your workstations should be in a subnet of their own, possibly even multiple subnets to keep network traffic segregated and keep it from going places it does not belong. It seems like your network is in a lot more serious trouble than just worrying about running out of IP addresses. Your DHCP should be handled by a server, having a router handle DHCP reservations is usually done as a last resort when you do not have another option. Setting up a DHCP server is not a difficult task, especially if you already have a server runninng Microsoft Server 2003 Standard or better. This is not intended to sound like a rant, but I read the first few posts and I could not beleive what I was seeing. There seem to be a lot more issues here that you are not even aware of that could be a serious security threat to your entire companies network.
|
|
|
|
11-30-2009 10:32 AM
|
|
|
|
|
|
|
|
