Well, it would seem that our internet connection seems to be back in order, although I’m not too thrilled with the manner in which it was ultimately fixed.
Here’s a rundown of what’s been going on:
Friday PM-Sunday PM - Our internet connection starts dropping out for about a minute every 33 minutes, almost to the second. In addition, outbound browsing is very slow and showing symptoms of packet loss. I open a ticket with TW tech support, but they claim that my situation can’t be monitored until Monday morning. I guess 24/7/365 support doesn’t apply to Tier 3.
Sunday PM-Monday AM - Our cable modem stops passing traffic completely. It still syncs up, but I’m unable to ping any external addresses with it. Another call to tech support ensues, and the tech finds that something may be wrong with whatever device that provisions are static IP addresses. Apparently cable modems that use DHCP are still working though, because I — well, let’s just say I found a way to get around this issue for a short time.
Monday AM-PM - We get the pleasure of becoming part of a widespread outage. No modem sync — at all. "Everyone who’s got a pulse is working on this one," the tech tells me. Well that’s good to know.
Monday PM - Wednesday - I finally see sync lights on our cable modem after popping my head in the datacenter for about the 15th time. Our internet is back, and it’s no longer dropping out every 30 minutes, but it’s still very slow…almost like DNS isn’t resolving properly (the answer is always DNS). Connections are fast ONCE their made, but it takes forever to get that far.
Wednesday - Slightly frustrated, I call Time-Warner again to see if they can look at the issue and stress-test our modem. The stress test doesn’t show any issues of packet loss. After looking at a few other things, this dialog ensues…
Tech: "What DNS server are you using?"
Me: "We’re using OpenDNS’s servers" (I rattle off the IP addresses)
Tech: <paraphrase>"Well, I’m looking at a bulletin sent out by our network team in response to an issue that’s been going on for about 5 days. (hey that sounds like us!) They’re recommending that anyone seeing speed issues make sure they’re using our DNS servers.
Me: "Well that’s great, but we use OpenDNS for our content filtering, plus we’ve been using them for a year now with no issues."
Tech: "Still, try changing your settings and see if that doesn’t help your speed issue." </paraphrase>
So I logged into our DNS servers and changed the forwarder addresses to match Time-Warner’s DNS servers. BOOM — instant speed increase. It would seem apparent that using TW’s DNS instead of OpenDNS fixed the issue, but now I’m left with just as many questions as answers. What’s up with OpenDNS? Do they have issues of their own? Is TW doing something on their end to interfere? If not, did a simple DNS query to a non-TW DNS server take forever?
Needless to say, I’m not too pleased with this situation. If this is going to be a permanent issue, I now have to find another way to do content filtering. I will most-likely be giving ScrubIT a try now to see if there are any similar issues. We’ll see how that goes.