<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Sep 10, 2014 at 3:42 PM, Sajan Parikh <span dir="ltr"><<a href="mailto:sajan@parikh.io" target="_blank">sajan@parikh.io</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span class="">On 09/10/2014 02:56 PM, Colin Law wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
On 10 September 2014 20:42, Sajan Parikh <<a href="mailto:sajan@parikh.io" target="_blank">sajan@parikh.io</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Right now, I can go into the connection manager, choose a wireless network<br>
and update the DNS servers to use by setting the IPv4 to Automatic DHCP,<br>
address only. However, when I connect to another network, the default is to<br>
pull an IP address from the DHCP along with the DNS servers.<br>
<br>
Is there a way for me to default all new connections to DHCP Address Only,<br>
and set some sort of permanent DNS servers? I thought about throwing them<br>
into /etc/resolv.conf, but I assume that gets overwritten everytime I switch<br>
connections.<br>
</blockquote>
I cannot help with the problem but would be interested to know why one<br>
would want to use specific DN Servers.<br>
<br>
Colin<br>
<br>
</blockquote></span>
Hotel networks, sometimes libraries, and even some coffee shops whose networks are configured by smaller, local ISPs have caused me issues multiple times over the past few weeks while traveling.<br>
<br>
Some DNS records that I absolutely know should resolve, don't. The last time I had this issue was at a hotel, and I ran dig +trace host.thatshoud.resolve and saw some message about some limit being reached. Thought it was incredibly weird. Edited my resolvers to Google, and it worked great of course.<br>
<br>
I don't know why that would happen, probably some upstream rate limiting, and I've never encountered this before the past 2 months. During which I've had this same exact issue at 5 different networks.<br>
<br>
*Yes, the records that don't resolve are being served by my own DNS cluster, but that is all working properly and the dig trace I ran showed the error well before anything was queried to one of my servers.<span class=""><font color="#888888"><br>
<br>
Sajan Parikh<br><br></font></span></blockquote><div><br></div><div>It sounds to me like you may be seeing effects of the Internet outages that started in August due to the number of Internet addresses in the world exceeding the space available in older routers.</div><div><br></div><div><a href="http://arstechnica.com/security/2014/08/internet-routers-hitting-512k-limit-some-become-unreliable/">http://arstechnica.com/security/2014/08/internet-routers-hitting-512k-limit-some-become-unreliable/</a></div><div><br></div><div><a href="http://en.wikipedia.org/wiki/512k_day">http://en.wikipedia.org/wiki/512k_day</a><br></div><div><br></div><div>My understanding is that Cisco has been warning about the impending failures for months </div><div><br></div><div><a href="http://blogs.cisco.com/sp/global-internet-routing-table-reaches-512k-milestone/">http://blogs.cisco.com/sp/global-internet-routing-table-reaches-512k-milestone/</a></div><div><br></div><div>but until some major sites went down starting August 12th, many less-informed network people were unaware of the looming problem. The issues are being resolved (for now) by Internet Service Providers installing newer hardware and newer operating systems for their routers. </div><div><br></div><div>If this is the error you're seeing, there's nothing you can do other than (as you have) trying a different DNS server and hoping the varying ISPs between you and the sites you're accessing are updating their routers. In other words, if this is the problem you're seeing, the problem isn't with Ubuntu, it's with Internet hardware outside your control.</div><div> </div></div></div></div>