HHG2500 as a wifi repeater causes issues like "This site cannot prove a secure connection"

[Sean214]

I set up my old hhg2500 router as a repeater for 5 ghz, turning dhcp off and connecting it from one lan port to another.

It made not only the repeaters wifi but the wifi from the main router give off errors such as the "this site cannot provide a secure connection" error on most sites, it also made the internet on both slow and almost unusable even though speed test said 40 down 8 up.

[Jayach]

When you say repeater, are you using the same SSID? 

[Sean214]

Maybe repeater is the wrong word, but no the SSID is different. I needed 5 ghz in another room.

[Ripshod]

Using this router as an access point (which is what you appear to be attempting) is fraught with problems. It's not designed to be used that way. 

[Sean214]

Damn that sucks, i was hoping i could get it working.

[Jayach]

You certainly should be able to. I don't know the HHG2500, but I know it would work fine with THG3000. (I was running one like that for quite awhile)

There's a YouTube video that explains just that. (36) Gigabit WiFi for a Fiver: Making the best value high performance Access Point (THG3000 setup gu... 

As long as you have switched off the DHCP, as you say you have, and are just using it as an access point it should work.

Is the cable you are using to connect them at least CAT 5e?

[CrimsonLiar]

LAN port to LAN port, unless you can also turn off NAT (Network Address Translation), the HHG2500 you want to use as an AP is still going to attempt to route internet traffic via its WAN/xDSL port.

If you "Double NAT" (connect to the WAN) the HHG2500 you may (or may not) get more mileage).  Double NAT works for some and not for others.  In many situations, if you are just browsing the internet Double NAT will work, but when it does fail, those failures can be subtle!  In most cases, accessing devices that provide local services, such as a network printer, can be badly impacted if the printer and the device accessing it are on different sides of that secondary router!

*Even if you do turn off NAT, there are still other protocols and services running on a router that will impact performance compared to using an access point!

[Jayach]

I just woke up, and realised you will also need to change the base address of the HHG2500, other wise it will be responding as the gateway, that is why it is messing with the main router.

I suggest using 192.168.1.200 as that is outside of the DHCP range of the THG3000 (assuming that is your main router)

You are definitely not double NATing as long as long as you don't use the WAN port on the HHG2500. 

If it is like the THG3000, you will need to change the base address before you switch off the DHCP,.

[CrimsonLiar]

The problem is with a LAN to LAN connection that anything connected to the nested router will still try to connect to the internet (anything outside its subnet) through its WAN or xDSL port - there is no means to change that behaviour in the router menus.

[Jayach]

With a LAN to LAN connection, they are on the same subnet, hence the  need to change the base address of the 2nd router. All you are using in the 2nd router is its switch and it's Wi-Fi.