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Author Topic: DIR 878 GUEST NETWORK PROBLEM  (Read 3296 times)


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« on: December 02, 2017, 08:35:30 AM »

Hi, I recently bought a DIR 878, and was able to set it up without any problem.

Recently, my guest network would NOT connect to the internet. I am able to connect my mobile phone to the router, but it says there is no internet. When I check the settings on my device, in advanced options, it says the IP address is

I do not know where that ip address is coming from.

My modem is set to, DHCP start.

My router 878 is connected via cable to the modem via the LAN PORT (DHCP is DISABLED)

mY 878 router ip address is

I am able to connect with any device to the non guest network, and the internet works.

but the guest network does NOT have internet at all.

This only happened a month after i bought the router, and there was no problem

I have done a hard reset etc etc...power cycled the modem, and the router. no luck.

I have another router connected to the same network, with a different router ip address ( and the guest network works just fine.

The guest networks have different SSIDs.

Anybody have any thoughts or possible solutions?

Thank you.



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    • Router Troubleshooting
« Reply #1 on: December 02, 2017, 09:11:30 AM »


  • What Hardware version is your router? Look at sticker under the router case.
  • Link>What Firmware version is currently loaded? Found on the routers web page under status.
  • What region are you located?

Internet Service Provider and Modem Configurations
  • What ISP Service do you have? Cable or DSL?
  • What ISP Modem Mfr. and model # do you have?
  • Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.
  • Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values
  • For DSL/PPPoE connections on the router, ensure that "Always ON" option is enabled.
  • If the ISP modem has a built in router, it's best to bridge the modem. Having 2 routers on the same line can cause connection problems: Link>Double NAT and How NAT Works. Call the ISP and ask to see if the ISP modem can be bridged. To tell if the modem is bridged or not, look at the routers web page, Status/Device Info/Wan Section, if there is a 192.168.0.# address in the WAN IP address field, then the modem is not bridged. If the modem can't be bridged then see if the modem has a DMZ option and input the IP address the router gets from the modem and put that into the modems DMZ. Also check the routers DHCP IP address maybe conflicting with the ISP modems IP address of Check to see if this is the same on the ISP modem, and if modem can't be bridged, change the DIR router to or .0.254.
    Example of a D-Link router configured for PPPoE with ISP Modem bridged: PPPoE Configuration on a Router

The 192.168.7.# address is the Guest Zone IP address pool on the DIR series router. This is normal.

If it has been working then suddenly stopped. I would try getting the ISP modem bridged fully if possible or give the DMZ option a try if the modem can't be bridged.
Cable: 1Gb/50Mb>NetGear CM1200>DIR-882>HP 24pt Gb Switch. COVR-1202/2202/3902,DIR-2660/80,3xDGL-4500s,DIR-LX1870,857,835,827,815,890L,880L,868L,836L,810L,685,657,3x655s,645,628,601,DNR-202L,DNS-345,DCS-933L,936L,960L and 8000LH.