Server 2003 behind Linksys router

[netadmin]

Guys..need some help here please.
I have dhcp server 2003 running behind a linksys wrt54g router. My dhcp server is giving out 10.x.x.x ip's to my lan clients. My linksys is giving out 192.x.x.x to wireless and lan clients.

My problem: my wireless clients are receiving 10.x.x.x ips. I need to stop that immediately. somehow my servers' dhcp is giving my wireless machines its ip. i need to separate the two. how can i?

TL

 

[netadmin]

This seems like a hard question.

 

[MrUnknown]

this sounds like a personal question and not that your a professional computer technician working on a client's problem. This forum is meant for computer repair professionals to help each other.

I don't think it is really a hard question though. I am not a networking expert but your basic problem is you have all your computers sending a request to the general network for an IP address and one server wins. Most home wireless routers see no difference between your LAN and your WiFi connections so that request go to your local LAN also. For whatever reason your 10.x server is winning and assigning IP addresses.

Off the top of my head, I don't know how you can use DHCP to assign your 10.x network automatically without a lot of configuration and that will just assign static IPs to known clients. If you hookup a new PC, then it will need to be configured or the DHCP server will need to be configured.

The other solution would be a proper LAN layout. Each LAN client should connect directly to the DHCP "2003" server and only that server should connect to the linksys router. You should be able to bind the DHCP server to only respond to the network card that points to your internal network.

So either do that or assign static IP addresses to all of your LAN computers and remove one of the DHCP servers

 

[netadmin]

Thanks for your answer...when i said i have a server etc etc..i am speaking on behalf of a client with the network. I am doing some configuration changes on it. i have a fairly knowledgable networking background but this particular issue is beating me.

i just want the linksys router to stop allowing dhcp from my server to pass through it and override its own dhcp settings. i wondered if this is possible.

Thanks for the tips though

TL
A+, N+, MCSA, MCSE

 

[MrUnknown]

I dont think it is if they are all on one network which they technically are as the wireless router treats wireless clients as LAN clients. You can buy wireless routers that do not allow the wireless clients to access the local network, not sure which brands. I think Apple's latest does. Hell, might be able to put dd-wrt on there and have it do it. Not sure if it can. A quick look at my tomato router and I don't think it can.

You can also do like I said, connect all the LAN clients to the 2003 server, and it to the router. That should work. The router would handle all clients connected to it, wireless and otherwise, and the 2003 server would handle clients connected to it. Shouldnt be too hard or expensive. Would only need a switch I believe.

one question is, are *any* clients getting 192.x addresses? If so, well, im not sure why that would happen.

 

[anonymous Mac Tech]

i have a fairly knowledgable networking background but this particular issue is beating me.

Not to sound rude but really....? I'm not a networking expert either. But networking 101 tells you when you have 2 dhcp enabled devices throwing out addresses at the same time you are asking for trouble without taking precautions. Possibly limited the address range in the server or perhaps setting up ACLs on both the server and router side should possibly do it.

 

[angry_geek]

First off, this is a pretty easy solution, so I'm not real sure how much of a tech you are. But I'll give you the benefit of the doubt. Put a second nic in the server. Get an access point or another router w/o wireless. Turn off DHCP in router. Set up DHCP on server with one range of ip's for nic 1 and another set for nic 2 (example: nic 1: 192.168.1.X, nic 2: 192.168.2.X). Plug router connected to internet into nic 1 on server along with your wired clients or switch. Set up access point or current router to access point mode with static ip on the nic 2 range (example: 192.168.2.159). Plug it into nic 2 on server (an access point will only have one port. If using router in AP mode, use one of the lan ports). Connect wireless clients. Voila. Seperated.

 

[netadmin]

Thanks for all your replies..


TL
A+, N+, MCSA, MCSE

 

[anonymous Mac Tech]

You're not serious right? Do you really have all of those certifications in your forum signature? I doubt it with this question that you have asked. That is basic networking 101 and basic hardware 101 which would fall into Network+ and A+, MSCE, and MCSA.

It's very logical problem, and an easy solution. Am I the only one here doubting his certification cred?

You know a quick google would have solved your issues in a few minutes.

You are definitely not the only on doubting those certs. I've seen paper techs before but WOW!

 

[angry_geek]

I honestly feel bad for the guy if he went through all the money, time, and trouble to acquire those certs, but can't figure this one out. I think it might even be in my Server 2k3 desk reference.

 

[14049752]

To be fair, any one of us could have made a simple mistake like this. Don't give a guy a hard time just because he may not be thinking clearly about something.

 

[angry_geek]

To be fair, any one of us could have made a simple mistake like this. Don't give a guy a hard time just because he may not be thinking clearly about something.

Good point. Fire away with your questions and suggestions, netadmin. I can understand those D'oh! moments.

 

[netadmin]

Thanks for your comments, once again.

 

[LunchBox]

Part of it also is creativity. I seen tech fix things the book way. Where another method not in Microsoft book on how things should be, would have fixed it the same.

I think it happens, sometimes people get stuck in the box while thinking and being stumped that they don't see the obvious. It has happened to me its part of learning or street learning I should say.

 

[anonymous Mac Tech]

TL
A+, N+, MCSA, MCSE

Something I noticed however. Why did all of the certs suddenly disappear of his signature?

 

[netadmin]

I can assure you my certs are real and my experience is real. I may not have explained the network scenario properly.

 

[netadmin]

Do you want me to provide my Comptia and MCP ID? Why not focus on helping people rather than attacking them.

 

[ITG Tech]

I noticed that the certs appeared right after the first person questioned him.

 

[netadmin]

Yes I did do that.