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R8500 DNS periodic DNS errors/failures

drummin1
Guide

R8500 DNS periodic DNS errors/failures

I have Frontier bonded DSL using Frontier's F2250 in transparent bridge mode connected to my R8500. All DHCP is handled by the R8500. I'm currently using the default Frontier DNS servers but have tried Google's and OpenDNS. Every couple hours the router drops the internet connection for 10 minutes or so. Regardless if I use Opera, Chrome, or IE, I get DNS errors. I never had DNS errors or dropouts just using the Frontier F2250. Only once I put the R8500 after the modem did my problems start. Is there any way to get this issue resolved. Downloads fail and have to be restarted, etc. Kinda annoying. 

Message 1 of 5

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drummin1
Guide

Re: R8500 DNS periodic DNS errors/failures

Here's what happened with both of my issues regarding the Frontier F2250 bonded dsl modem feeding the R8500 router. One issue was the periodic DNS errors that started this thread and the other issue was in a separate thread regarding my downstream bandwidth getting halved by the R8500. In one fell swoop, both were resolved to my delight. 

 

A little background to set the table; The Frontier bonded modem's wireless-N radio would cause the modem to overheat and reboot a couple times a day. It was due to the ever-increasing # wireless toys that we purchased. They overwhelmed it's little ass. This in mind, I got an R8500 for the 802.11ac protocol that our newer phones, tablets, and devices were built on. Frontier modem went into transparent bridge mode and I leaned on the R8500 for all the workload. DNS errors, dropped connections, etc. These ended up being worse than the periodic reboot the Frontier modem would do. Top it off with the R8500 cutting my 20x1 service to 10x1.

 

For giggles, I disconnected the R8500 and shut it down. I reset the Frontier modem and provisioned it with the PPPoE settings favored by Frontier. I disabled my laptop's wireless and plugged into the modem via ethernet. I tested bandwidth three times over half an hour using Speedtest.net. I got 20Mbps x 1.1Mbps with 31ms pings each time. Reversing the setup by disabling the ethernet port on my laptop and enabling the wifi connection I tested three more times in half hour. I got 18Mbps x 1.1Mbps with 32ms pings. After this I disabled the Frontier modem's wireless radio.

 

A factory reset of the R8500 router later and I plugged one of the modem's LAN ports into the R8500's WAN port. I moved the ethernet cable I had used to plug into the Frontier modem for the speedtest into one of the R8500's LAN ports. During initial setup, the R8500 suggested a scenario whereby I leave the Frontier modem's wireless radio off and only have the R8500 plugged into the Frontier modem via ethernet. Anything downstream of the Frontier modem and the R8500 should only get connected to the R8500. Since the R8500 and the Frontier have different default IP addresses, there shouldnt be any issues between the two by way of DHCP servers being active on both devices. I ran the same speedtests in sets of three with wired and wireless connections to the R8500. Boom! I got 20Mbps x 1.1Mbps with 32ms to 34ms pings in both wired and wireless scenarios. Finally I ran the QoS speedtest inside the R8500 and it saw the full 20Mbps x 1.1Mbps that I should have been getting all along. For some damn reason, putting the Frontier in bridge mode confused the R8500 and it only pulled bandwidth from one of the bonded pair. Probably not compatible with ADSL2+ bonded modems. Too many addresses that the Frontier used to handle deftly when it was king of the hill were left in a pile for the R8500 when the Frontier was bridged. Anyway, things seem to have worked out. 

 

Thanks to those that tried to help and I'll go on doing what I do best; Being an example of what not to do. I have this running joke that I tell people when **bleep** like this happens to me. "There are two ways to do things, the right way and the wrong way. My way is a lot like the wrong way, but faster..."

 

-Mike

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Message 4 of 5

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ElaineM
NETGEAR Employee Retired

Re: R8500 DNS periodic DNS errors/failures

Hi @drummin1 When did the problem start? Is it working before?

What kind of configuration you have on the R8500?

Do you have a username and password provided by your ISP?

Did you set that login in the admin page of the R8500?

Message 2 of 5
drummin1
Guide

Re: R8500 DNS periodic DNS errors/failures

ElaineM, 

 

Within an hour or two of connecting the R8500 to the modem is when it got wonky. First I reset the modem to defaults, entered my PPPoE login and password back into the modem to provision it for access. Then I found the transparent bridging option in the router and enabled it. Enabling bridging mode disables the modem's DHCP server and every other function of the modem. I rebooted the modem and it reestablished both dsl lines. Then I plugged the WAN port of the R8500 to LAN port 4 on the modem. I logged into the R8500 and setup the internet settings for my Frontier PPPoE service. I left all the IP addresses and DNS servers to Frontier to provide dynamically. I had read that Frontier can get pissy about not using their DNS servers. Then I changed the broadcast SSID's and passphrases leaving all the default security in place inside the R8500. I enabled Dynamic QoS and disabled all the Guest Network channels. Come to think of it, there was a firmware update that popped up on the R8500 early on during setup. That went smoothly. I should also mention that I am running firmware V1.0.2.30_1.0.43 as of a couple days ago. This seemed to help a little with the dropouts but not entirely. Outside of adding my Qnap NAS using the R8500's Ethernet Port Aggregation feature, most other settings remained at factory defaults. When the DNS erros start, I visually check the modem to make sure the two dsl lines are green and the LAN port to the router is green and flashing madly with activity. I log into the R8500 and usually see that the Internet Status on the home page is red and reads disconnected. Usually I click over to the Advanced tab and click on the Connection Status button on the internet port. Invariably it reads "connected" and "Success" for both Negotiation and Authentication. Frontier's IP address is displayed along with the subnet. Also the Connection Time reads that more than a day or so. I click disconnect, wait, then hit reconnect. This works about 75% of the time. Meanwhile the lights on the R8500 remain all white and flashing like usual along with the modem's green lights. I only ever see the WAN LED on the R8500 turn orange during a reboot. Otherwise the two routers appear happy outwardly. I had read that Chrome experiences more than its fair share of DNS problems, so when the errors start I fire up IE and get the same errors. 

 

Thanks for getting back to me!

 

-Mike

Message 3 of 5
drummin1
Guide

Re: R8500 DNS periodic DNS errors/failures

Here's what happened with both of my issues regarding the Frontier F2250 bonded dsl modem feeding the R8500 router. One issue was the periodic DNS errors that started this thread and the other issue was in a separate thread regarding my downstream bandwidth getting halved by the R8500. In one fell swoop, both were resolved to my delight. 

 

A little background to set the table; The Frontier bonded modem's wireless-N radio would cause the modem to overheat and reboot a couple times a day. It was due to the ever-increasing # wireless toys that we purchased. They overwhelmed it's little ass. This in mind, I got an R8500 for the 802.11ac protocol that our newer phones, tablets, and devices were built on. Frontier modem went into transparent bridge mode and I leaned on the R8500 for all the workload. DNS errors, dropped connections, etc. These ended up being worse than the periodic reboot the Frontier modem would do. Top it off with the R8500 cutting my 20x1 service to 10x1.

 

For giggles, I disconnected the R8500 and shut it down. I reset the Frontier modem and provisioned it with the PPPoE settings favored by Frontier. I disabled my laptop's wireless and plugged into the modem via ethernet. I tested bandwidth three times over half an hour using Speedtest.net. I got 20Mbps x 1.1Mbps with 31ms pings each time. Reversing the setup by disabling the ethernet port on my laptop and enabling the wifi connection I tested three more times in half hour. I got 18Mbps x 1.1Mbps with 32ms pings. After this I disabled the Frontier modem's wireless radio.

 

A factory reset of the R8500 router later and I plugged one of the modem's LAN ports into the R8500's WAN port. I moved the ethernet cable I had used to plug into the Frontier modem for the speedtest into one of the R8500's LAN ports. During initial setup, the R8500 suggested a scenario whereby I leave the Frontier modem's wireless radio off and only have the R8500 plugged into the Frontier modem via ethernet. Anything downstream of the Frontier modem and the R8500 should only get connected to the R8500. Since the R8500 and the Frontier have different default IP addresses, there shouldnt be any issues between the two by way of DHCP servers being active on both devices. I ran the same speedtests in sets of three with wired and wireless connections to the R8500. Boom! I got 20Mbps x 1.1Mbps with 32ms to 34ms pings in both wired and wireless scenarios. Finally I ran the QoS speedtest inside the R8500 and it saw the full 20Mbps x 1.1Mbps that I should have been getting all along. For some damn reason, putting the Frontier in bridge mode confused the R8500 and it only pulled bandwidth from one of the bonded pair. Probably not compatible with ADSL2+ bonded modems. Too many addresses that the Frontier used to handle deftly when it was king of the hill were left in a pile for the R8500 when the Frontier was bridged. Anyway, things seem to have worked out. 

 

Thanks to those that tried to help and I'll go on doing what I do best; Being an example of what not to do. I have this running joke that I tell people when **bleep** like this happens to me. "There are two ways to do things, the right way and the wrong way. My way is a lot like the wrong way, but faster..."

 

-Mike

Message 4 of 5
ElaineM
NETGEAR Employee Retired

Re: R8500 DNS periodic DNS errors/failures

Thank you for updating us.

Glad that it's working.

Message 5 of 5
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