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Wireless problem getting the proper gateway on the network

Posted on 2006-07-24
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Last Modified: 2010-03-17
I have a wireless router that connects to a Broadband modem (the modem is giving out addresses on DHCP) and the wireless is set up with a static address say 10.XX.XX.200. and the wireless also hands out about 20 addresses from. 201 to 220.  The network has both Mac and PC users.  The users pick up and address of 10.XX now but after an hour or two the gateway of 10.XX.XX.1 (which will allow the users to print properly and get everywhere changes to 10.XX.XX.200 (the static address of the wireless device) this change of gateway locks any users from printing on doing simple tasks.
 
  If an ipconfig release / renew is done then all works again for a few hours only.  Is there a way to lock the wireless device to only use the gateway of the broadband router?  Or am I going about this incorrect.

(the goal is to have both Mac and PC users connect on the wireless and get an address of 10.XX and be able to print and access files properly) -- Static addressing on the users pc i snot an option since too many complaints when they need to connect outside the network.

Thanks in advance.
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Question by:irving90
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by:hladamjr
ID: 17169207
What make/ model router. You say...

> I have a wireless router that connects to a Broadband modem (the modem is giving out addresses on DHCP)

 All you need is one from the modem. The method doesn't make a difference as long as your router can obtain a WAN ip from the modem your fine. It get the Gateway, and DNS servers it uses from the modem.

>the wireless is set up with a static address say 10.XX.XX.200. and the wireless also hands out about 20 addresses from. 201 to 220.

What do you mean when you say you have it set to static 10.xx.xx.200 ??? Did you change the IP range assigned to your internal network it from the default router settings? If so why ad why are you using static.

You then say that if you do a release and renew ( which only can e done for DHCP addressing ) it works fine. I assume you mean on the users pc/  You canot assign static addresses in the router and expect the users to be able to use them if they are configured to pick up a DHCP address


Please calrify all the aboe with a little more explanation as to why you are using a 10 net addressing schem and what ethod the modem provides the router with an IP, how the router is set to dispnse IP's ( Static or DHSP) and how the clients are configuredto use TCP/IP.

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by:irving90
ID: 17169511
Thanks for the response - let me clarify this if I can.

There is an internal network that is giving out address on DHCP (10.xx) and when the wireless was setup also with DHCP it was giving out the standard 192. addresses and you can access everything but cannot print.  So to get wireless to pick up an address on the main network, the wireless was set with a static address of 10.XX.XX.200. This was done to get an address that would allow us to print.  And the users PC/MAC is set to DHCP but the wireless router now gives out a DHCP address of 10.XX rather than 192.XX.

When a 10. number is given out to a wireless mac or pc the user can print to any printer wireless and the gateway of the mac or PC is listed as 10.XX.XX.1 (which works great), but after a few hours the default gateway changes to the static address of the wireless router .200 and when this happens the uses can not print wireless.   A wireless print server may be the answer but I would like to set this up properly.  I hope this is a little more helpful.
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by:irving90
ID: 17169597
Router - Comcast

Wireless Router - Linksys WRT54G
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by:hladamjr
ID: 17170014
Ok That clarifies things better. Another question, You have the wirelss router setup with a static address. Thats fine, BUT is the router on the internal network set to have the IP address of the wireless router ( 10.xx.xx.200 ) defined as a Static address only and NOT in the pool for available DHCP adresses ? Remeber just becasue you have the wireless router setup with a static address ( in the wireless router) doesn't mean that the internal network knows it as such. What I mean is this..... it is possible, depending on what the lease time for DHCP addresses on the internal network is that when the lease for 10.xx.xx.200 expires it does get renewed but for some reason the  gateway  on the wireless is reseting to .200 due to it not being able to communicate with the internal network momentarily.

Do you understand what I am referring  to ? Let me know and we can keep going.
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by:irving90
ID: 17170137
Yes. So far I undersatnd.  The problem I have is when I dial into the Comcast router I cannot change the DHCP settings to lock the .200 address.  I called comcast but they offer no networking help. I agree that may be causing the problem but it happen within a short time 1-2 hours makes me think that the address would be locked on the comcast router and not given out even with DHCP. Also when the gateway changes everything works except printing.

 I hope this helps.
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by:hladamjr
ID: 17170204
When you say it is a Comcast Router is it physically located on your site or is it at one of their locations?  You also say you dial into the Comcast Router, do you mean via analog telephone dialup?

If it is offiste and they do not offer Network support and you cannnot  access the router to manage it., then that will need to be resolved to check that. Who sewt up the router ? Comcast?

Let me know as to go much further we  need to determine the parameters under which things are opreating right now to determine what is causing the problem and/or if things are setup correctly. Without being able to get into the Comcast router and look at things it may be difficult, not impossible but more difficult as long as we can confirm some operational parameters of the router.

 
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by:irving90
ID: 17170292
The router is onsite with a user and password it can be logged into.  There are no settings I can see that can change the configuration of DHCP. Just basic setting such as name - port info. NAT settings, port forwarding, etc.
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by:hladamjr
ID: 17170297
Another question I assume you got this additional router soley for wireless laptop usuage  why a router and not a wirelss access point? Much easier to manage one network address scheme or is there another reason?
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by:hladamjr
ID: 17170366
Okay thats good, what model is it? There should be a setting to check for what the lease time is for DHCP adresses. Tell me the model and we'll go from there.
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by:irving90
ID: 17170406
Yes the reason was for Laptop access, i actually tried an access point originally and I could not change the security to work properly and the access point was accessable esily in to the network.  If the setting would work i will try an access point again - Will an access point give out a 192 address or static from the network?
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by:irving90
ID: 17170460
SMC Router - Comcast

Wireless Router - Linksys WRT54G
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by:hladamjr
ID: 17170634
ACcess point security needs to be dealt with your correct ACcess points are different than routers in that they do not manage DHCP, they act simple like a hub, IP is handled by whatever device manages IP adresses on your net work be it a router or DHCP server

What particular SMC model router do you have, I'll pull up the manual on it so I can give you better help.
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by:irving90
ID: 17170742
The model is SMC8013WG

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by:hladamjr
ID: 17171142
The SMC 8013WG is a Wireless Cable Modem Gateway. Previously you have said that you have an  internal network and you have a wireless network. How many routers do you have on your Network just this one?

This router has a setting were you can set the lease time on DHCP addresses. It covers both  the wired and wireless connections to it.  I don't see how you would set 20 ips aside for staqtic use only by wireless

When you refer to first having the wireless set to 192 and you couldn't print  so you switched it to  10.XX.XX and you could print , where did you switch that. In the this router or on the client? With this router I do not know of any way to have the internal or wired  pc's on one addressing schema and the wireless on another. It just isnt possible.

Al this brings me to another question now. Where your business or office is located are there other offices or business around you that have wireless networks? Is it possible that when you originally set things up that you were on someones elses 192. netwrk so that is why you could not print?

I hate keep asking questions but the way you are describing things I do not have a clear picture of you hardware setup. Tell me evrything you have hooked up network wise

Like the Cable modem is connected to this then this is conected to that etc etc. If there is  hardware other than the cable modem and the SMC 8013WG router let me know.

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by:irving90
ID: 17171292
There are two routers the broadband router and the Linksys router.  I will attemt to go back into the broadband router and do all the setups there since it is listed as having wireless settings.  But I am told a different story about that SMC Broadband router having wireless ability.  

The wireless Linksys router can be changed to offer only certain address ranges out but actually the main DHCP from the SMC router controls it.  It is not possible that the addressing can change. The ips are given out correctly but the Gateway changes.  There are 255 addresses given out on the 10.xx network both wireless and hard wired.  And when the gateway changes the users cannot print.  

I will try to change all the setting on the SMC router to break off the wireless from the wired if possible and get back.  Sorry if these setups are not being explained fully and you help has been great on this.
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hladamjr earned 125 total points
ID: 17175282
The SMC3018WG does have the ability to do wireless. However that ability may or may not be disabled by Comcast. First thing I suggest is to call them ( yes I know they don't provide network support ) abd have them confirm if they disable or not allow the wireless feature of the SMC to be used. If they have disabled wireless on the SMC router then your best option would be to set up a wireless access point. Access points as I said function the same as a hub. The problem you are running into stems from the fact you are runnig two routers One off the otgher. Management is more difficult as you have found.

Check with Comcast on the SMC and see what they tell you.
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by:irving90
ID: 17176021
The Router is disabled and I am working with them to re-enable the wireless functionality, also I will move to Access points rather than additional routers.  Thanks for all your help on this - you were a great help.

Thanks Again.
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by:hladamjr
ID: 17176592
Glad I could help !, if they are enabling the wireless functionality of the SMC router then I would use that. Since it is all going to be managed from the SMC router then it should be simpler than what you have been trying to do. If you do run into further issue or questions just post it her and I or someone else should be able to assist.

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