Resolve Wrong IP from Domain Name only on certain networks
- by Godric Seer
I host a personal website on an old desktop that is LAMP based. There are several strange things about this problem so I will break it down into steps.
Since I have a dynamic IP, I use no-ip to make sure I have a working domain name at all times. I use the automatic update client, but logged in and checked and my no-ip domain has the proper IP tied to it. Here is a link to the homepage through the no-ip domain for reference. Also, I do a ping and a traceroute on the no-ip domain and get:
[eckertzs@localhost ~]$ ping -c 1 endradil.noip.me
PING endradil.noip.me (65.24.215.99) 56(84) bytes of data.
64 bytes from endradil.noip.me (65.24.215.99): icmp_seq=1 ttl=64 time=2.23 ms
--- endradil.noip.me ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 104ms
rtt min/avg/max/mdev = 2.233/2.233/2.233/0.000 ms
[eckertzs@localhost ~]$ traceroute endradil.noip.me
traceroute to endradil.noip.me (65.24.215.99), 30 hops max, 60 byte packets
1 . (192.168.2.1) 1.755 ms 5.409 ms 5.380 ms
2 endradil.noip.me (65.24.215.99) 6.297 ms 9.543 ms 10.324 ms
Using this domain, I can connect to my webserver without issue or interruption(the https is required to avoid a redirect serverside, but it works).
I also have a domain I have bought on GoDaddy where I have a CNAME record forwarding the www subdomain to my no-ip domain.
CNAME Record
Host: www
Points to: endradil.noip.me
TTL: 1 hour
For the past several weeks, I never had an issue using the GoDaddy domain to connect (ssh or https). As of the past few days, however, the GoDaddy domain has only worked intermittently, for a few minutes at a time and then will go down for hours at a time. I get server not found errors most of the time. Also, if I happen to be using the GoDaddy domain for an ssh connection, the connection will freeze.
I have run online tests of the DNS and have seen that the website is visible by external servers and resolved to the correct IP. I also contacted GoDaddy support but they had no issues connecting to the website, and therefore did not see any issues. My personal computers (Windows desktop, linux laptop, android phone) all fail to connect when on my personal wifi. If I disconnect my phone from the wifi and use my AT&T wireless data, it can connect with both domains without issue. When I attempt to use Google webmaster tools to crawl the site using the GoDaddy domain, Google can not find the site.
From my linux laptop, I have found some interesting results when I ping or traceroute the domain. The results from these:
[eckertzs@localhost ~]$ ping -c 1 www.endradil.com
PING www.endradil.com.Belkin (198.105.244.228) 56(84) bytes of data.
--- www.endradil.com.Belkin ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 10000ms
[eckertzs@localhost ~]$ traceroute www.endradil.com
traceroute to www.endradil.com (198.105.244.228), 30 hops max, 60 byte packets
1 . (192.168.2.1) 1.918 ms 2.806 ms 2.772 ms
2 cpe-65-24-208-1.insight.res.rr.com (65.24.208.1) 29.247 ms 29.654 ms 30.094 ms
3 cpe-69-23-24-117.new.res.rr.com (69.23.24.117) 15.597 ms 23.218 ms 23.581 ms
4 agg24.clmcohib01r.midwest.rr.com (65.29.1.52) 30.581 ms 30.556 ms 31.192 ms
5 be27.clevohek01r.midwest.rr.com (65.29.1.38) 30.580 ms 31.062 ms 31.038 ms
6 bu-ether25.atlngamq47w-bcr01.tbone.rr.com (107.14.19.38) 37.863 ms 68.844 ms 43.773 ms
7 107.14.17.178 (107.14.17.178) 51.866 ms 51.019 ms 50.989 ms
8 ae0.pr1.dca10.tbone.rr.com (107.14.17.200) 48.467 ms ae-4-0.a0.lax91.tbone.rr.com (66.109.1.113) 49.912 ms *
9 v413.core1.ash1.he.net (209.51.175.33) 60.270 ms 50.842 ms 50.819 ms
10 100ge5-1.core1.nyc4.he.net (184.105.223.166) 55.597 ms 56.045 ms 56.020 ms
11 xerocole-inc.10gigabitethernet12-4.core1.nyc4.he.net (216.66.41.242) 56.001 ms 55.969 ms 55.992 ms
12 * * *
both show the incorrect IP. Also, the traceroute timesout on hops 12 through 255 (output truncated above). The traceroute using site24x7 works and shows reasonable results when run from their california server. From another linux box on a different network but in the same city as me (10 miles away), I still get timeout for traceroute, however the IP resolves correctly for the domain.
From this I believe that the DNS result is incorrectly cached in either my router/modem or perhaps even at my ISP level. My question is, first, how do I find out exactly what is wrong, and second, how do I resolve it.
