3 ms·
Lots of well meaning kids go and setup Level 3 resolvers on grandma's home network, then the ISP has to deal with support calls when someone elses DNS servers g
by dsl 13y ago
Lots of well meaning kids go and setup Level 3 resolvers on grandma's home network, then the ISP has to deal with support calls when someone elses DNS servers go down.
As a result quite a number of networks "hijack" 4.2.2.0/24 and route it locally to their own resolvers.
- ds9 13y agoHow can one detect whether this is happening?
- sexmonad 13y agoI'm not sure if it's a certain way to tell, but try running a traceroute. If your traffic seems to go into Level3's network, that's a good sign that it's not getting rerouted. Here's what I see from my DigitalOcean droplet. root@derpy:~# traceroute -I 4.2.2.1 traceroute to 4.2.2.1 (4.2.2.1), 30 hops max, 60 byte packets 1 198.199.122.1 (198.199.122.1) 12.055 ms 12.123 ms 12.314 ms 2 xe-10-3-3-100.edge3.Newark1.Level3.net (4.28.6.69) 0.948 ms 0.959 ms 0.959 ms 3 ae-31-51.ebr1.Newark1.Level3.net (4.69.156.30) 1.396 ms 1.477 ms 1.478 ms 4 ae-10-10.ebr2.NewYork1.Level3.net (4.69.132.97) 1.530 ms 1.630 ms 1.659 ms 5 ae-62-62.csw1.NewYork1.Level3.net (4.69.148.34) 1.465 ms ae-82-82.csw3.NewYork1.Level3.net (4.69.148.42) 1.464 ms ae-62-62.csw1.NewYork1.Level3.net (4.69.148.34) 1.390 ms 6 ae-1-60.edge2.NewYork1.Level3.net (4.69.155.16) 1.363 ms 1.389 ms 1.395 ms 7 a.resolvers.level3.net (4.2.2.1) 1.456 ms 1.466 ms 1.421 ms
- pyre 13y agoOn the flipside, when the local ISP's DNS goes down, many a time will the support person have no knowledge of it, and run you thought the "do you own a computer? did you turn it off and on again?" spiel. You act as if most ISP support actually admits to problems on their own network and/or that troubleshooters have access to this information.