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Author Topic: Router breaks access to nearby public IP address  (Read 5206 times)

Skidborg

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Router breaks access to nearby public IP address
« on: December 06, 2016, 12:02:59 PM »

So I'm setting up a file server for a summer camp.  Simple setup.  Server box is in the main office at the top of the hill, behind a static public IP address (XXX.XXX.124.164).  Works fine with internal connections and most external ones around town.  Firewall is autoblocking login attempts from Malaysia.  Good times.

Now, I head down to the hill to the main lodge.  The devices are behind a DIR-859 router and a different cable modem than the office.  Its public dynamic IP address is from the same ISP and block of IP addresses (XXX.XXX.124.166). 

Now:
Connecting via any other location/connection CAN ping the XXX.XXX.124.164 IP address and connect to my remote file server.
Plugging my laptop directly into the cable modem CAN ping the XXX.XXX.124.164 IP address and connect to my remote file server.
Plugging my laptop into the DIR-859 router which is plugged into the cable modem CANNOT ping the XXX.XXX.124.164 IP address or connect to my file server but CAN ping and connect to other sftp servers across the web.

So the problem appears to be specific to the router, and specific to IP addresses which are nearby.  What settings or further debug information should I be looking at to fix this?
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FurryNutz

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Re: Router breaks access to nearby public IP address
« Reply #1 on: December 06, 2016, 12:33:31 PM »

Link>Welcome!

  • 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 at the main lodge and main office?

Is the 859 the only router being used? What is being used at the main office?
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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.

Skidborg

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Re: Router breaks access to nearby public IP address
« Reply #2 on: December 06, 2016, 05:01:19 PM »

The DIR-859 is running firmware 1.04.

I'm on Vancouver Island.

I have cable internet service to both locations. 
The ISP is Gulf Island Cable, which is a local ISP.
The cable modem for both is the Motorola SB5120.

The router up at the main office is a JCG JYR-N490. A low-end unit and there's limited manufacturer's support, but it seems to be doing everything correctly. Port forwarding is functioning.

Edit: Router at main office is now also a DIR-859.  Still the same issue.
« Last Edit: December 07, 2016, 01:52:07 PM by Skidborg »
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FurryNutz

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Re: Router breaks access to nearby public IP address
« Reply #3 on: December 07, 2016, 02:07:20 PM »

And this remote server is at one of these locations main or lodge or at a different location?

I'm wondering if maybe a firewall rule may need to be set up... :o
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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.