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Forum Discussion
FVS336Gv2 DNS Issues?
This week, I was trying to get a VPN established on my office's FVS336Gv2 router. After encountering some issues, I opted to attempt a firmware update to see if that could resolve the problems I was ...
Hi pwn3d781,
Welcome to the community! :)
Kindly answer the questions below:
a. Disconnect the PC/s from the GS748T switch then directly connect the PC/s to the FVS336Gv2, are you able to go online just fine?
b. What speed/bandwidth are you getting if you connect a PC directly to the FVS336Gv2?
c. What is your subscribed speed/bandwidth from your ISP or Internet Service Provider?
d. Kindly try to connect a PC directly to the modem, are you able to access any website just fine?
e. What speed/bandwidth are you getting if you connect a PC directly to the modem?
f. Is your modem a modem-only device or a router and modem combination?
g. Is the WAN IP Address registered on your FVS336Gv2 a Public IP Address? To verify this, go to Monitoring > Router Status on the web-GUI of the FVS336Gv2.
h. What is the current firmware of the GS748T switch?
I look forward to your response.
Regards,
DaneA
NETGEAR Community Team
Hi Dane,
a. When I was working on configuration yesterday, I had my laptop connected directly to the FVS336Gv2, with the same errors as before.
b/c. Honestly we're not having any speed/performance issues. Without running a proper speed test, I would say access times are about where they were before I flashed the FVS336Gv2. And that's whether through the switch or the FVS336Gv2. The only issue we're having is relative to DNS apparently failing to load.
d/e. There appear to be no issues when connected directly to one of the modems. Speed/throughput is about the same, but I went through about 10 different sites and all loaded without hesitation. I'd be lucky to have the same success while on the LAN.
f. The two modems are (WAN1, dynamic) a Netgear CG3000DCR and (WAN2, static IP) a Cisco DPC3939B. Both are four-port modem/routers, as configured by Comcast. I have not made any changes to the modems.
g. WAN 2 is a public IP address; that is the static IP we have registered with our ISP. The modem attached to WAN 1 is a private IP for the ISP. I only have one externally-viewable port configured (for our security camera system) and I can successfully view that from my home PC.
h. The firmware on the GS748T is 6.3.0.9 - that's what it shipped with.
To reiterate, until the firmware update that I performed last Monday, everything was running like clockwork, as it had since I installed the hardware out of the box. I am assuming it must have something to do with DNS caching or accessing the servers, and I wish I could say it were predictable, but it's not.
Hi pwn3d781,
On the web-GUI of your FVS336Gv2, kindly uncheck both "Block TCP flood" and "Block UDP flood" as shown below then check if same problem occurs.
Regards,
DaneA
NETGEAR Community Team
Dane,
I tried unchecking both boxes about 5 hours ago. Since then, I have not had any reports network-wide of DNS issues or pages failing to load. It appears this has resolved our issues, though I'll keep monitoring it over the coming days.
I honestly assumed those two options as something relative to intrusion detection (and admittedly, I did not confirm if they were checked off on the previous firmware revision, they would have been left at the factory defaults). I take it they can interfere with DNS traffic to some extent?
Thanks,
Jeff
Hi pwn3d781,
I'm glad that it has resolved the issue. :) Just continue to observe your network.
Let me share this old forum link since the problem you have experienced is kinda related to it.
Regards,
DaneA
NETGEAR Community Team
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