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[akahimaro]

Hello, i have a small problem with my dir 655 when i tried to use it with the motorola sb6121 cable modem
So i have comcast service. If i connect straight up from sb6121 modem to my computer, my speed test will be around 55mb down and 11mb up all the time. But when connect it through my dir 655 router, I only get half of the speed 25-26mb down and 0.9mb up???
Could anyone help me solve this problem? Been using the dir 655 for 2 years now and it been working perfect.
(Just switched from att to comcast)

[FurryNutz]

Link>Welcome!

• What Hardware version is your router? Look at sticker under router.
• Link>What Firmware version is currently loaded? Found on routers web page under status.
• What region are you located?
• Are you wired or wireless connected to the router?
• Has a Factory Reset been performed?

Internet Service Provider and Modem Configurations
http://forums.dlink.com/index.php?topic=50791.0

Router and Wired Configurations
Some things to try: - Log into the routers web page at 192.168.0.1. Use IE, Opera or FF to manage the router.

• Turn off ALL QoS or Disable Traffic Shaping (DIR only) GameFuel (DGL only and if ON.) options, Advanced/QoS or Gamefuel.
• Turn off Advanced DNS Services if you have this option under Setup/Internet/Manual or under Setup/PARENTAL CONTROL/Set to>None: Static IP or Obtain Automatically From ISP.
• Enable Use Unicasting (compatibility for some ISP DHCP Servers) under Setup/Internet/Manual.
• Turn on DNS Relay under Setup/Networking. Link>Finding Faster DNS Addresses using Name Bench
• Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting.
• Ensure devices are set to auto obtain an IP address.
• If IPv6 is an option on the router, select Local Connection Only or Disable IPv6 options under Setup/IPv6.
• Set Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall.
• Enable uPnP and Multi-cast Streaming under Advanced/Networking. Disable uPnP for testing Port Forwarding rules. Enable IPv6 Multi-cast Streaming for routers that have a Media Server option. Disable IPv6 Multi-cast Streaming if IPv6 or Media Server is not being used.
• Turn off WISH, and WPS under Advanced.
• WAN Port Speed set to Auto or specific speed? Some newer ISP modems support 1000Mb so manually setting to Gb speeds can be supported by the router. Advanced/Advanced Networking/WAN Port Speed
• Set current Time Zone, Date and Time. Use an NTP Server feature. Tools/Time.
• Check cable between Modem and Router and PCs, swap out to be sure. Link> Cat6 is recommended.

[akahimaro]

Hardware Version: B1     Firmware Version: 2.10NA   
Wired connector
I did factory reset perform already and tried all your setting, still same problem.
I won't able to get full speed i got from my modem itself.

[akahimaro]

Updated: I was able to call comcast and solve my problem...I was dumb the modem was not register the MAC ID yet so after they done that. I was able to get fullspeed...Thanks for helping again

[FurryNutz]

Awesome...glad it's working. The 6121 is a great modem. Enjoy.