On Fri, Apr 12, 2019 at 12:37 PM Paul A <ra...@meganet.net> wrote: > Mark, per my previous email, this high latency only happens when digging > for > Comcast. I did not compile bind on this machine, I'm using the latest Bind > package that came with CentOS 7, bind-chroot-9.9.4-73.el7_6.x86_64. Looking > at the changelog for the RPM it doesn't mention any issue with dig and > latency and I assume this has been patched by Redhat at some point. > > I just wanted to verify that what Im seeing with Comcast is somehow not > related to only me and someone else is seeing this issue. The lastest dig > I > did came back with > "dig: couldn't get address for 'dns101.comcast.net': no more" so I doubt > it's a dig version issue. > > Paul > > > ;; Received 239 bytes from 192.5.6.30#53(192.5.6.30) in 32 ms > > net. 172800 IN NS k.gtld-servers.net. > net. 172800 IN NS b.gtld-servers.net. > net. 172800 IN NS l.gtld-servers.net. > net. 172800 IN NS a.gtld-servers.net. > net. 172800 IN NS m.gtld-servers.net. > net. 172800 IN NS c.gtld-servers.net. > net. 172800 IN NS i.gtld-servers.net. > net. 172800 IN NS e.gtld-servers.net. > net. 172800 IN NS d.gtld-servers.net. > net. 172800 IN NS g.gtld-servers.net. > net. 172800 IN NS h.gtld-servers.net. > net. 172800 IN NS j.gtld-servers.net. > net. 172800 IN NS f.gtld-servers.net. > net. 86400 IN DS 35886 8 2 > 7862B27F5F516EBE196804 > 44D4CE5E762981931842C465F00236401D 8BD973EE > net. 86400 IN RRSIG DS 8 1 86400 20190425050000 > 2019 > 0412040000 25266 . Uk5bsrr1dgoBFUYfzSYTi6D+QXow1CZglnE3BUZ7I/I0HjuywiSf2YLx > eU1c > rjlYOJQdYPxDFQIH5/aItTtrM7wgvTOhfhHPHQuAj2f8ovYIlwCt > hguq+9jcNTMAzrUXvi6Tb8oTb36 > lprYIfg21yO1d8RO6cx3L0dJMcuez > WN2kxNAg+wrx+dWbOexFO7Hs0gzDPpsMx0lEOkJHcfyb/V71An > MV+nob 48G/azRzQ2fJfs849OyYmjTXA88bAcxxz3kNCoddOfWuMU+WKV5Lfy7J > NkegEfRCzRZYYKiD > MwI0zURTg+CdZAYKuxvJQW9ddzSiK5UnYXZVSO1d fPXfYQ== > ;; Received 1168 bytes from 199.9.14.201#53(b.root-servers.net) in 88 ms > > comcast.net. 172800 IN NS dns101.comcast.net. > comcast.net. 172800 IN NS dns102.comcast.net. > comcast.net. 172800 IN NS dns103.comcast.net. > comcast.net. 172800 IN NS dns104.comcast.net. > comcast.net. 172800 IN NS dns105.comcast.net. > comcast.net. 86400 IN DS 40909 5 2 > 30C0F50E68DCC9A2F279A9 > 94C07CF22CED97AADF44C2B1FE38A1B32B A1A34174 > comcast.net. 86400 IN DS 40909 5 1 > DDC19733884EE533B35B4B > 57717BEA9B0EF2C4D1 > comcast.net. 86400 IN RRSIG DS 8 2 86400 > 20190417054136 > 2019 > 0410043136 51638 net. > l2Vj2W+qzAziqzcC+Y+t4+6b6ADTwyILCzbySVmj5mj5J9vscR4mYf+f X > zNGKen73GecLw+HiwwSzUG8jYkGtvNOMrj9ZbC4v+XWuq0EFcxDEhbJ > yTAq2wPMGD6evSUSDLfqYu8h > oJH9svqS06KlBjWkKQqx8X+ZIIqmUMVk ivk= > dig: couldn't get address for 'dns101.comcast.net': no more > > -----Original Message----- > From: Mark Andrews [mailto:ma...@isc.org] > Sent: Friday, April 12, 2019 11:20 AM > To: Paul A <ra...@meganet.net> > Cc: bind-users@lists.isc.org <bind-us...@isc.org> > Subject: Re: dns latency > > Before you pay attention to the round trip time you need this fix from BIND > 9.9.6 from nearly 5 years ago now (2014-07-31). > > 3903. [bug] Improve the accuracy of DiG's reported round trip > time. [RT 36611] > > Mark > > > On 13 Apr 2019, at 12:59 am, Paul A <ra...@meganet.net> wrote: > > > > This is not really a Bind issue, but can anyone else confirm latency > > when querying Comcast from the root down? I ask because this morning > some > of our customers Could not email @comcast addresses, looked at the mail > server and domain not found. I suspect my cache for Comcast timeout and > when > my DNS server tried doing a new query it timeout on GTLD server to Comcast? > > > > When I query directly to their DNS servers there is no latency, so I > suspect this is a link issue at Comcast affecting DNS? > > > > TIA paul > > > > > > > > ; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7_5.1 <<>> @192.5.6.30 comcast.net > > -t a +trace ; (1 server found) ;; global options: +cmd > > . 518400 IN NS i.root-servers.net. > > . 518400 IN NS j.root-servers.net. > > . 518400 IN NS k.root-servers.net. > > . 518400 IN NS l.root-servers.net. > > . 518400 IN NS m.root-servers.net. > > . 518400 IN NS a.root-servers.net. > > . 518400 IN NS b.root-servers.net. > > . 518400 IN NS c.root-servers.net. > > . 518400 IN NS d.root-servers.net. > > . 518400 IN NS e.root-servers.net. > > . 518400 IN NS f.root-servers.net. > > . 518400 IN NS g.root-servers.net. > > . 518400 IN NS h.root-servers.net. > > ;; Received 239 bytes from 192.5.6.30#53(192.5.6.30) in 32 ms > > > > net. 172800 IN NS a.gtld-servers.net. > > net. 172800 IN NS b.gtld-servers.net. > > net. 172800 IN NS c.gtld-servers.net. > > net. 172800 IN NS d.gtld-servers.net. > > net. 172800 IN NS e.gtld-servers.net. > > net. 172800 IN NS f.gtld-servers.net. > > net. 172800 IN NS g.gtld-servers.net. > > net. 172800 IN NS h.gtld-servers.net. > > net. 172800 IN NS i.gtld-servers.net. > > net. 172800 IN NS j.gtld-servers.net. > > net. 172800 IN NS k.gtld-servers.net. > > net. 172800 IN NS l.gtld-servers.net. > > net. 172800 IN NS m.gtld-servers.net. > > net. 86400 IN DS 35886 8 2 > 7862B27F5F516EBE19680444D4CE5E762981931842C465F00236401D 8BD973EE > > net. 86400 IN RRSIG DS 8 1 86400 > 20190425050000 20190412040000 25266 . > Uk5bsrr1dgoBFUYfzSYTi6D+QXow1CZglnE3BUZ7I/I0HjuywiSf2YLx > eU1crjlYOJQdYPxDFQIH5/aItTtrM7wgvTOhfhHPHQuAj2f8ovYIlwCt > hguq+9jcNTMAzrUXvi6Tb8oTb36lprYIfg21yO1d8RO6cx3L0dJMcuez > WN2kxNAg+wrx+dWbOexFO7Hs0gzDPpsMx0lEOkJHcfyb/V71AnMV+nob > 48G/azRzQ2fJfs849OyYmjTXA88bAcxxz3kNCoddOfWuMU+WKV5Lfy7J > NkegEfRCzRZYYKiDMwI0zURTg+CdZAYKuxvJQW9ddzSiK5UnYXZVSO1d fPXfYQ== > > ;; Received 1168 bytes from 198.97.190.53#53(h.root-servers.net) in 19 > > ms > > > > comcast.net. 172800 IN NS dns101.comcast.net. > > comcast.net. 172800 IN NS dns102.comcast.net. > > comcast.net. 172800 IN NS dns103.comcast.net. > > comcast.net. 172800 IN NS dns104.comcast.net. > > comcast.net. 172800 IN NS dns105.comcast.net. > > comcast.net. 86400 IN DS 40909 5 2 > 30C0F50E68DCC9A2F279A994C07CF22CED97AADF44C2B1FE38A1B32B A1A34174 > > comcast.net. 86400 IN DS 40909 5 1 > DDC19733884EE533B35B4B57717BEA9B0EF2C4D1 > > comcast.net. 86400 IN RRSIG DS 8 2 86400 > 20190417054136 20190410043136 51638 net. > l2Vj2W+qzAziqzcC+Y+t4+6b6ADTwyILCzbySVmj5mj5J9vscR4mYf+f > XzNGKen73GecLw+HiwwSzUG8jYkGtvNOMrj9ZbC4v+XWuq0EFcxDEhbJ > yTAq2wPMGD6evSUSDLfqYu8hoJH9svqS06KlBjWkKQqx8X+ZIIqmUMVk ivk= > > ;; Received 612 bytes from 192.42.93.30#53(g.gtld-servers.net) in > > 25090 ms > > > > comcast.net. 30 IN A 69.252.80.75 > > comcast.net. 30 IN RRSIG A 5 2 30 20190418174157 > 20190411143657 26550 comcast.net. > YegwZlzjBoJ+b9nWTHwRZQbce619UcOVdo6FUPG056Sod4MEchv/GCHu > 7BpREAUm0CBoE4qbipTiS47wIk7QJYzz10B78wRgMGNwMTUXQ571YRyq > P0I3I0Dzag28j607walJOZms3lAXDzSnyvv9wocaH2MJ7Z3j68Qf5pKh YpM= > > ;; Received 227 bytes from 69.252.250.103#53(dns101.comcast.net) in 14 > > ms > > > > _______________________________________________ > > Please visit https://lists.isc.org/mailman/listinfo/bind-users to > > unsubscribe from this list > > > > bind-users mailing list > > bind-users@lists.isc.org > > https://lists.isc.org/mailman/listinfo/bind-users > > -- > Mark Andrews, ISC > 1 Seymour St., Dundas Valley, NSW 2117, Australia > PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org > >
I get 57ms max for the various gtld servers. Could you try this: for x in a b c d e f g h i j k l m; do echo "==== $x ===="; dig comcast.net. +norec +noall +auth +stats @$x.gtld-servers.net.; done -- Bob Harold
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