Router to managed switch... ISP won't disable DHCP... I need help.

[Batmeat]

Here's the problem. My dad's ISP are bonkers. They require him to use their modem/router. This is fine, but they also require DHCP. This isn't fine. He has home theater equipment in nearly every room. His house is wired so he can access any of it with his iphone and ipad. The problem is that his receivers require static IP's in order for him to have access throughout the house on his ipad and iphone. His ISP won't disable DHCP. his address range covers x.x.x.1 (gateway) - x.x.x.254. I found this out using some network tools and trying to set the IP of a receiver outside the range of his DHCP. It didn't work.

The question is.... is possible to have a setup where the internet comes into his house ---->ISP router------->managed switch ---->all his devices, or is the router still going to try and assign addresses to the devices? If this won't work, is there a way to bypass the dhcp on the router? Oh, and his ISP won't give him access to the router, nor will they disable dhcp. Resetting the router isn't a good option because he isn't tech savy enough to set it up, and I live a few hours away from his house, not to mention he has no idea what his ISP protocols are to setup the router assuming we do just reset the router.

suggestions?

 

[mxnerd]

Your Dad's ISP giving out DHCP WAN IP for the router has nothing to do with internal static LAN IP requirement for his receiver.

Ask him to download Teamviewer QS from here

http://download.teamviewer.com/qs and run it. Ask him to give you ID/password.

You also run Teamviewer https://www.teamviewer.us/downloads/

and remote into his PC, login into his router and set a static IP using MAC address for his receiver.

If you can't login his router, then configure his receiver using an IP address that's in the range like xxx.xxx.xxx.201 - xxx.xxx.xxx.253. in most case it won't conflict with other devices.

 

[JackMDS]

Posting the make and model of the Modem/Router is Not a ""Sin"", and it would help to Help you.

 

[Batmeat]

His router is TPlink router. That's all I know about it. Can't log in to the router as it's locked down by his ISP. I use Teamviewer 13. The range for dhcp is set from x.x.x.2 - x.x.x.254. I already found this out using some ip scanning software and confirmed it by having my dad call is ISP.

Your Dad's ISP giving out DHCP WAN IP for the router has nothing to do with internal static LAN IP requirement for his receiver.

If you can't login his router, then configure his receiver using an IP address that's in the range like xxx.xxx.xxx.201 - xxx.xxx.xxx.253. in most case it won't conflict with other devices.

I thought setting a static IP for his devices will conflict with his router assigning out IP addresses....no?

 

[sdifox]

Pick 250. Chances are you don't have enough devices to saturate dhcp range and if you get assigned, reconnect or reset router. This is the first I have heard of isp controlling lan though. They won't even reduce the dhcp range by one?

 

[mxnerd]

Some router will assign LAN dynamic IP starting from .2 ,10, some .50, or.100. Even if you have 100 devices, you will only reach .199 if it starts at 100.

Like sdifox has said, pick 250. I don't believe it will conflict with any other devices on his local network.

The IP range 2-254 you mentioned only tells you it's available for being taken, not already been taken.

 

[Batmeat]

This is the first I have heard of isp controlling lan though. They won't even reduce the dhcp range by one?

Asinine I agree. I told my dad to get a new ISP. He is going to look into it. I'll start assigning his devices and see what happens.

 

[ch33zw1z]

who's the ISP and what's the modem/router model?

 

[VirtualLarry]

If you don't care about double-NAT, you can always get a second router, and use it for your LAN, and then use your ISP router as the WAN connection for your router. That would give you a local LAN subnet, all under your own control.

 

[ch33zw1z]

If you don't care about double-NAT, you can always get a second router, and use it for your LAN, and then use your ISP router as the WAN connection for your router. That would give you a local LAN subnet, all under your own control.

probably the easiest way to get around it.

 

[Rifter]

If you don't care about double-NAT, you can always get a second router, and use it for your LAN, and then use your ISP router as the WAN connection for your router. That would give you a local LAN subnet, all under your own control.

As much as i hate double NAT, and will never under any circumstance use that setup myself, it does seem like the best option for this situation.

 

[Batmeat]

Double NAT isn’t a game breaker, although not ideal. I’ll try and see what happens. Shouldn’t be a problem.

 

[sdifox]

Double NAT isn’t a game breaker, although not ideal. I’ll try and see what happens. Shouldn’t be a problem.

Scan your subnet, see which ips are assigned to your devices. Assign static ip further from what the dhcp server hands out.

Only issue with assigning ip in dhcp range is the potential of the dhcp server assigning the same ip ip to something else.

Don't go to double nat unless you have no choice. I would switch isp before O go double nat.

 

[VirtualLarry]

Double-NAT isn't horrible. Unless you're running services on your connection. accessible to the outside world (against TOS of consumer internet connections?), or gaming, which is often a P2P affair. Maybe P2P file transfers would be affected too, I don't know. Accepting incoming Skype calls might also be affected.

 

[Batmeat]

Drove home and I'm currently working on it. So far I have access to the internet (duh) cause I'm typing on the boards here. But the ISP router is assigning dhcp which is passed through my LInksys WRT54GL using DD-WRT firmware.

 

[VirtualLarry]

Then you hooked it up wrong, or you have DD-WRT configured wrong.

You should hook the WAN port of the "inner" router, to the LAN port of the ISP router.

 

[JackMDS]

Double NAT main problem is Port opening.

Since an Open port can be Open only toward one IP, the Double NAT creates a problem with ports that need to be opened to the Interent (or the first subnet) through from the Second WAN.

As a result if one does not know well Networking and has the correct Hardware it might be impossible to really utilize double NAT on a Network.

 

[Malogeek]

This doesn't sound at all logical. I can't see any reason for the ISP to be controlling internal LAN.

What is the actual IP range for the DHCP? Not just X's

 

[mv2devnull]

What is the actual IP range for the DHCP? Not just X's

We don't need to know the actual range. It is enough to know whether it is one of the private subranges or not.
https://en.wikipedia.org/wiki/Private_network

DHCP can hand out "static IP", if you can configure the DHCP. If the ISP does not allow you to configure the router, then they should do the configuration as a service. If not ...

 

[Malogeek]

We don't need to know the actual range. It is enough to know whether it is one of the private subranges or not.

Yeah that's what I'm actually after, is it a private range.

 

[PliotronX]

I would probably introduce a device or computer with two nics and set to transparent before the switch to configure a filter of broadcasts. I am curious why setting static IPs on the receivers does not work. That should always work as long as you have the right GW, network, and SNM plugged in. He can't possibly have 253 devices occupying the entire subnet to cause a conflict.

 

[Batmeat]

I don’t have 253 devices. The ISP configured their router to utilize the entire range of available IP’s.

Anyways, I have it working now. Had a family barbecue and when I came back I had the LAN port of the inner router connected to the WAN port of the ISP router. Simple fix.

Also, I called his isp. It’s Rise Broadband, not TPLink. TPLink is the router brand. My dad isn’t the most tech savvy when I asked him those questions a couple days ago.

Thank you everyone for your help.

Now I just got to buy him a good router, as that WRT-54GL is old and limited as to how much data it can push via wireless access. As long as it isn’t a netgear nighthawk is what his ISP tech told me over the phone. Odd, because that’s what I use at my house, and it’s awesome.

Anyway, gota get him a good router and clone the Settings over and set the MAC address to match the WRT-54GL and all should be good.