Szerző: info at smallinnovations dot nl Dátum: Címzett: dng Tárgy: Re: [DNG] Weird network issue - slow to resolve IPs
On 12-10-18 23:35, golinux@??? wrote: > On 2018-10-12 15:25, Rick Moen wrote:
>> Quoting info at smallinnovations dot nl (info@???):
>>
>>> I had something similar but with ssh. Some debugging learned that IPv6
>>> was preferred but my ISP connection does not have IPv6. After 60
>>> seconds
>>> ssh time out and changed back to IPv4 and made connection after all.
>>> After this discovery I disabled IPv6 on my local network.
>>
>> This is a common problem and is why you shouldn't test networking
>> problems using Web browsers, but rather with simple command-line tools
>> such as dig, ping, traceroute, and tcptracroute.
>>
>> I note that dig has flags '-4' and '-6' to limit DNS resolution to only
>> IPv4 or only IPv6, respectively.
>> _______________________________________________
>>
> Thanks for the responses. I suspect that IPv6 might indeed be the
> culprit.
>
> Let me start by posting a traceroute to google.com:
>
> $ traceroute google.com
> traceroute to google.com (74.125.129.102), 30 hops max, 60 byte packets
> 1 * * *
> 2 tge0-0-0.ausdtx2802h.texas.rr.com (66.68.2.205) 45.543 ms 46.092
> ms 46.373 ms
> 3 agg30.ausxtxir02r.texas.rr.com (24.175.42.144) 24.660 ms 25.364
> ms 25.750 ms
> 4 agg22.hstqtxl301r.texas.rr.com (24.175.41.48) 31.765 ms 36.379
> ms 35.651 ms
> 5 ae-1-0.p0.atl90.tbone.rr.com (66.109.1.218) 50.802 ms 44.462 ms
> 39.178 ms
> 6 bu-ether12.dllstx976iw-bcr00.tbone.rr.com (66.109.6.39) 45.106
> ms 34.283 ms 107.14.19.49 (107.14.19.49) 36.338 ms
> 7 0.ae1.pr1.dfw10.tbone.rr.com (107.14.17.234) 35.058 ms
> 0.ae2.pr1.dfw10.tbone.rr.com (107.14.17.236) 27.868 ms 25.589 ms
> 8 ix-ae-23-0.tcore2.dt8-dallas.as6453.net (66.110.57.97) 32.475 ms
> 39.941 ms 52.998 ms
> 9 74.125.50.214 (74.125.50.214) 31.421 ms 34.253 ms 38.467 ms
> 10 * * *
> 11 216.239.63.238 (216.239.63.238) 34.677 ms 108.170.226.56
> (108.170.226.56) 29.073 ms 108.170.226.182 (108.170.226.182) 29.651 ms
> 12 108.170.240.145 (108.170.240.145) 29.667 ms 108.170.240.209
> (108.170.240.209) 32.095 ms 108.170.252.130 (108.170.252.130) 34.320 ms
> 13 216.239.59.168 (216.239.59.168) 29.987 ms 108.170.233.117
> (108.170.233.117) 30.326 ms 108.170.228.84 (108.170.228.84) 31.091 ms
> 14 209.85.250.37 (209.85.250.37) 30.081 ms 38.277 ms 35.229 ms
> 15 209.85.246.182 (209.85.246.182) 56.902 ms 209.85.246.84
> (209.85.246.84) 77.541 ms 209.85.246.182 (209.85.246.182) 73.471 ms
> 16 216.239.56.175 (216.239.56.175) 63.061 ms 216.239.54.65
> (216.239.54.65) 61.564 ms 216.239.48.67 (216.239.48.67) 65.893 ms
> 17 * * *
> 18 * * *
> 19 * * *
> 20 * * *
> 21 * * *
> 22 * * *
> 23 * * *
> 24 * * *
> 25 * * *
> 26 * * *
> 27 jm-in-f102.1e100.net (74.125.129.102) 168.457 ms 171.191 ms
> 170.337 ms
>
> Good grief!!! Another trace route eventually got to one of my websites:
>
> $ traceroute stopcta.info
> traceroute to stopcta.info (185.203.114.117), 30 hops max, 60 byte
> packets
> 1 * * *
> 2 tge0-0-0.ausdtx2801h.texas.rr.com (66.68.2.201) 330.761 ms
> 331.380 ms 331.773 ms
> 3 agg30.ausutxla01r.texas.rr.com (24.175.42.142) 25.345 ms 26.732
> ms 27.302 ms
> 4 agg22.dllatxl301r.texas.rr.com (24.175.41.46) 37.000 ms 33.044
> ms 37.558 ms
> 5 bu-ether14.dllstx976iw-bcr00.tbone.rr.com (66.109.6.88) 41.860 ms
> 66.109.1.216 (66.109.1.216) 40.157 ms 41.325 ms
> 6 66.109.5.121 (66.109.5.121) 31.192 ms 42.090 ms 25.595 ms
> 7 dls-b21-link.telia.net (62.115.156.208) 27.346 ms 28.104 ms
> 27.084 ms
> 8 atl-b22-link.telia.net (80.91.246.74) 49.968 ms 58.985 ms
> 49.461 ms
> 9 mai-b1-link.telia.net (62.115.122.53) 69.445 ms 67.043 ms
> 59.106 ms
> 10 init7-ic-318278-mai-b1.c.telia.net (62.115.148.55) 70.009 ms
> 77.143 ms 72.151 ms
> 11 r2nyc3.core.init7.net (193.47.153.231) 71.850 ms 70.682 ms
> 78.191 ms
> 12 r1nyc3.core.init7.net (193.47.153.238) 80.221 ms 73.209 ms
> 69.531 ms
> 13 r1nyc2.core.init7.net (193.47.153.234) 84.886 ms 74.355 ms
> 70.098 ms
> 14 r1lon2.core.init7.net (77.109.128.14) 140.249 ms 140.124 ms
> 147.072 ms
> 15 r1bsl1.core.init7.net (77.109.128.102) 173.037 ms 162.066 ms
> 164.498 ms
> 16 r1zrh2.core.init7.net (77.109.128.129) 159.150 ms 152.605 ms
> r1bsl3.core.init7.net (82.197.168.18) 160.159 ms
> 17 r1glb1.core.init7.net (77.109.128.238) 165.343 ms
> r1zrh8.core.init7.net (82.197.168.74) 155.252 ms
> r1glb1.core.init7.net (77.109.128.238) 171.133 ms
> 18 empty.init7.net (77.109.141.139) 159.961 ms 156.963 ms 165.937 ms
> 19 * r1glb1.core.init7.net (77.109.140.205) 156.057 ms 159.736 ms
> 20 empty.init7.net (77.109.141.139) 165.136 ms
> 117-114-203-185.place5.ungleich.ch (185.203.114.117) 169.960 ms
> empty.init7.net (77.109.141.139) 161.785 ms
>
> I (or rather Evilham and Nico) recently moved my websites to a devuan
> IPv6 VPS which is set up to serve IPv4 too through some sort of
> server-side magic I don't really understand. I suspect this might be
> what triggered things. I am clueless how to test if IPv6 is actually
> enabled on my network or how to disable it if it is. Maybe someone
> can save me some hours of searching? I really need to work on the
> refracta website a bit.
>
> golinux
>
>
> _____________
Disabling IPv6 can be done with adding in /etc/sysctl.conf: