Question Blue Cave router cuts Modem's internet speeds in half

May 15, 2019
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I have Spectrum @ 200MBPs. Had their router, which was very unreliable and would cut my ethernet in and out. (Might've been due to my ethernet cable having been chewed on by my puppy Barry O though. Thanks Obama.)

Nevertheless, I replaced the modem with a Netgear CM600 and the router with a Asus Blue Cave.

The router succesfully posts at 230/11MBPs D/U (miss when my upspeed was also 200, but Spectrum gave me the 'they can't honor TWC's price and speed spiel).

Unfortunately though, whether through Ethernet or Wifi, the Router just won't go above 130MBPs, and even that takes very long to get to.

I've turned QoS off and on. IPV6 is on at Native, tried it with only the Ethernet being hooked up to my PC to no avail. I am using brand new 6e cables too.

Any thoughts on why this may be happening?
 

Ralston18

Titan
Moderator
Which device (either the modem or the router) is providing DHCP IP addresses?

Only one or the other should be doing so.

Normally the modem's DHCP IP addressing function is disabled and the router does the work.

Run "ipconfig /all" (without quotes) via the command prompt on your PC.

Post the results.

And try known working Ethernet cables. New cables could be defective and not working at the rated speeds.
 

Dragos Manea

Admirable
Even if the DHCP is enabled on both, the router has a WAN port which is isolated from the output lan which are controlled by DHCP of the router, in short you need both DHCP enabled or you end up configuring ip adresses manually. Modem has to allocate to router an ip (DHCP does this automatically) and router has to allocate to each device an ip (this must be done by router because WAN port is isolated from LAN or WIfi so modem cannot see the other devices, just the router which in return controlls the output ports, so DHCP enabled again). Coorect me if i m wrong but i believe this is the way it works.
 
May 15, 2019
2
0
10
0
Which device (either the modem or the router) is providing DHCP IP addresses?

Only one or the other should be doing so.

Normally the modem's DHCP IP addressing function is disabled and the router does the work.

Run "ipconfig /all" (without quotes) via the command prompt on your PC.

Post the results.

And try known working Ethernet cables. New cables could be defective and not working at the rated speeds.
Here are the results from the ipconfig:

Code:
Windows IP Configuration

   Host Name . . . . . . . . . . . . : Silas-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
   Physical Address. . . . . . . . . : D0-50-99-7B-C5-52
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2606:a000:111e:844d:d4d8:92a6:82b5:d39f(Preferred)
   Temporary IPv6 Address. . . . . . : 2606:a000:111e:844d:e003:d7c5:f3f4:44ff(Preferred)
   Link-local IPv6 Address . . . . . : fe80::d4d8:92a6:82b5:d39f%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.50.37(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, May 15, 2019 6:58:34 PM
   Lease Expires . . . . . . . . . . : Thursday, May 16, 2019 6:58:34 PM
   Default Gateway . . . . . . . . . : fe80::4eed:fbff:fe9b:6730%11
                                       192.168.50.1
   DHCP Server . . . . . . . . . . . : 192.168.50.1
   DHCPv6 IAID . . . . . . . . . . . : 80760985
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-23-71-27-37-D0-50-99-7B-C5-52
   DNS Servers . . . . . . . . . . . : 1.1.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Ethernet 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TAP-Windows Adapter V9
   Physical Address. . . . . . . . . : 00-FF-B8-37-7C-5D
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
   Physical Address. . . . . . . . . : 5C-F3-70-7E-38-52
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
From what I can tell, the Router is providing DHCP. The modem offers no settings of any kind. Interestingly enough, I am now unable to go past 90MBPs (75MBPs on Ethernet connected PC) and my hardwired PC cannot access router.asus.com even though my other wireless devices can. I can even access it remotely on my phone.
 

digitalgriffin

Distinguished
Jan 29, 2008
326
33
18,820
1
Turn on nat tables and reboot. If that doesnt work hard reset.

https://www.smallnetbuilder.com/wireless/wireless-reviews/33194-asus-blue-cave-ac2600-dual-band-wireless-router-reviewed?showall=&start=2

Also whats your connection speed? Just because you have a fast 4x4 router doesnt mean your wifi is running at full speed. The longer your distance to the router the more your speed drops.

The ethernet is a trickier issue. I would still look at the connection speed to be sure. I doubt you were negotiated down to 100mbps. But you never know. This is especially true for long runs of 50+ feet.

In this case you can temporarily hook your pc straight up to the modem amd then run the speed test. This is temporary only but it will tell us if its the router.

Be warned the longer your pc is straight connected to the modem the longer you expose yourself to attacks from hackers and viruses on the internet. Set your network to public and use good antivirus with a built in firewall.
 
Last edited:

digitalgriffin

Distinguished
Jan 29, 2008
326
33
18,820
1
Here are the results from the ipconfig:

Code:
Windows IP Configuration

   Host Name . . . . . . . . . . . . : Silas-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Ethernet Connection (2) I218-V
   Physical Address. . . . . . . . . : D0-50-99-7B-C5-52
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2606:a000:111e:844d:d4d8:92a6:82b5:d39f(Preferred)
   Temporary IPv6 Address. . . . . . : 2606:a000:111e:844d:e003:d7c5:f3f4:44ff(Preferred)
   Link-local IPv6 Address . . . . . : fe80::d4d8:92a6:82b5:d39f%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.50.37(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, May 15, 2019 6:58:34 PM
   Lease Expires . . . . . . . . . . : Thursday, May 16, 2019 6:58:34 PM
   Default Gateway . . . . . . . . . : fe80::4eed:fbff:fe9b:6730%11
                                       192.168.50.1
   DHCP Server . . . . . . . . . . . : 192.168.50.1
   DHCPv6 IAID . . . . . . . . . . . : 80760985
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-23-71-27-37-D0-50-99-7B-C5-52
   DNS Servers . . . . . . . . . . . : 1.1.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Ethernet 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TAP-Windows Adapter V9
   Physical Address. . . . . . . . . : 00-FF-B8-37-7C-5D
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
   Physical Address. . . . . . . . . : 5C-F3-70-7E-38-52
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
From what I can tell, the Router is providing DHCP. The modem offers no settings of any kind. Interestingly enough, I am now unable to go past 90MBPs (75MBPs on Ethernet connected PC) and my hardwired PC cannot access router.asus.com even though my other wireless devices can. I can even access it remotely on my phone.
Hard coding the dns into windows bypasses the routers dns. So the router never sees your router.asus.com.
 

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