chuckkk
join:2001-11-10
Warner Robins, GA
 ·Cox HSI
|  [GA] Mid GA Slow DNS service.
Over the last few weeks, DNS service has started to "time out" more and more frequently, causing browser "not found" errors for those addresses and web pages not cached.
The normal speed tests for the same period show increased speeds more often than not, and of all things about 40% packet "out of order" test results.
»miranda.ctd.anl.gov was used for detailed testing multiple times. The packet "out of order" % increased with the increase in tested speeds.
Cable line levels and noise ratios well within normal limits for my drop, and no problems noticed with CATV or HDTV channels.
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robl27
Premium
join:2008-07-16
Mary Esther, FL | try switching DNS to 4.2.2.2 and 4.2.2.3 should help a lot
-Rob |
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NoVA_CoxUser
Stand back from the cage -- The RF bites
Premium
join:2004-07-06
Alexandria, VA | reply to chuckkk
You might also try OpenDNS.
»www.opendns.com/ |
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chuckkk
join:2001-11-10
Warner Robins, GA
·Cox HSI
1 edit | reply to chuckkk
I've had to do this in the past, and even used software that select DNS servers dynamically. It's a heck of a lot simpler when Cox does what it's supposed to do. It seems (in this area) whenever things are going well, "upgrades" and changes can screw things up. The DNS problems more or less coincide with actual speed upgrades in the local area. Interestingly enough, I see higher speeds to major metro centers that are reached by going off the Cox network than I do with metro centers accessed from within the Cox network. (This is subjective, since I certainly don't know all the details.) |
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LordFlux
join:2005-04-20
Warner Robins, GA
1 edit | reply to chuckkk
I've noticed the DNS server problem as well. Switched to OpenDNS and it's working much much better. |
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chuckkk
join:2001-11-10
Warner Robins, GA
·Cox HSI
1 edit | DNS problems continue on an intermittent basis. Naturally, as usual, Cox Middle GA Customer service claims "no problems".
What problems do I see?
Speed tests after the upgrade show that upload speeds are higher, perhaps a bit too high if this was gained at the expense of download speeds. (As high as 3-4Mb/s upload, and 4-6-Mbps download) This was ~1Mbp/s up and 12-13 Mb/s down before the problems started.
The problems seem to be related to the switch back and forth between "powerboost" and normal data transfer rates.
In addition, a high % of packets (30-40%) are typically "out of order", using »miranda.ctd.anl.gov/ as a testing site.
Smoke Ping shows latency to be ~ 80. Past latency test results (a month ago and previous) were much less, in the 40 range. |
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bbeesley
VIP
join:2003-08-07
Las Vegas, NV
| reply to chuckkk
said by chuckkk  : DNS service has started to "time out" more and more frequently, causing browser "not found" errors for those addresses and web pages not cached. are you actually testing DNS or is this just the browser producing a "time out" message
If it is the latter, then there could be any number of issues - to include DNS timeouts but to be sure you need to isolate your test
I just checked the primary nameserver for Macon and got 134ms on an uncached query
bbeesley@deep-thought:~$ dig @68.1.18.237 www.regularthinking.com
;; Query time: 134 msec
;; SERVER: 68.1.18.237#53(68.1.18.237)
;; WHEN: Mon Jul 20 12:59:23 2009
;; MSG SIZE rcvd: 133
When I tried the query a second time, it pulled in 68ms
bbeesley@deep-thought:~$ dig @68.1.18.237 www.regularthinking.com
;; Query time: 68 msec
;; SERVER: 68.1.18.237#53(68.1.18.237)
;; WHEN: Mon Jul 20 13:01:01 2009
;; MSG SIZE rcvd: 133
and this is from Las Vegas so from what I can see, the nameserver is responding quite quickly on both non-authoritative and cached lookups....but this is a snapshot of a moment in time.
If you could take a moment to do a similar test when you are getting the time out messages to see if the issue is the nameservers themselves? |
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chuckkk
join:2001-11-10
Warner Robins, GA
·Cox HSI
| These kinds of warnings are appearing more frequently in the modem log.
Besides browser "address not found" errors, there are also other symptoms, such as during file transfers via non Cox newsgroups.
(Microsoft, Corel, etc.
2009-07-20 23:08:53 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out
2009-07-20 15:18:53 warning DHCP RENEW WARNING - Field invalid in response
2009-07-20 08:31:44 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out
2009-07-20 03:19:05 notice TLV-11 - unrecognized OID
2009-07-20 03:18:40 critical DHCP WARNING - Non-critical field invalid in response.
2009-07-20 03:18:37 critical DHCP FAILED - Discover sent, no offer received |
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Ikyuao
Pro. debian Linux
join:2007-02-26
Wichita, KS
·Cox HSI
2 edits | reply to chuckkk
Try using dnsmasq DNS caching server, by adding local host 127.0.0.1 and just open 53 udp port for listening on your firewall. And combines 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4 DNS addresses and opendns be added in your DHCP client that if you are running linux computer that will help big lots.
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Professional Linux environmental blows microsoft windows out of the water. |
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chuckkk
join:2001-11-10
Warner Robins, GA
·Cox HSI
| reply to chuckkk
Cox Las Vegas Speed test
MySpeed Results
Download 3,291,024 bps
Upload 1,497,744 bps
Java is required.
BEFCMU10 ver. 4 Firmware Version: 2.0.3.4.2-1212
Status Comment
Acquire Downstream Channel 699000000 Hz Locked
Connectivity State Operational Operational
Boot State OK Operational
Security Enabled BPI+
Downstream Channel
Lock Status Operational
Modulation 256QAM
Channel ID 1
Provisioned Rate 11500 kbps
Symbol Rate 5360.537 Ksym/sec
Downstream Power -2.0 dBmV
SNR 38.7 dB
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Ikyuao
Pro. debian Linux
join:2007-02-26
Wichita, KS | that your downstream signals look very good condition. |
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bbeesley
VIP
join:2003-08-07
Las Vegas, NV
| reply to chuckkk
said by chuckkk :2009-07-20 23:08:53 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out 2009-07-20 08:31:44 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out T3 errors occur when the modem sends a request to the CMTS to see if it needs to change it's upstream channel and it doesn't get a response back. Some T3's are normal but if you see a bunch of these occurring, then we need to start looking for return path impairments.
In this instance, you had one in the morning and then another one 15 hours later so that doesn't concern me. The other errors are just normal network fluff... the modems are actually quite chatty in regard to what errors they log and not all are significant. |
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chuckkk
join:2001-11-10
Warner Robins, GA
·Cox HSI
2 edits | I didn't see anything that pointed to major problems either.
The DNS difficulties come and go. Perhaps the only thing I wonder about is the 42% out of order packet messages from the gov test site. This sort of makes a bit of sense, in that streaming video (even heavily buffered) often has small sound or video "glitches". My cell phone can utilize my closed access wifi, and actually has more serious problems with streaming video, since buffering memory and processing speed is considerably less than that of my desktop P/C.
It's also possible that my "node" is getting overloaded, due to a recent influx of families with teenagers in my neighborhood and the subdivisions around us. (Older folks moving out, younger families moving in) |
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Ikyuao
Pro. debian Linux
join:2007-02-26
Wichita, KS
·Cox HSI
1 edit | Mine is no problems at all when there's perking time at evening or tonight that matters of there's bunch of young families of teenagers or either old folks who use it no matter what type of activity what they are doing with cable internet that due i use multiple DNS addresses to revives web names really fast enough so however no matter how DNS server are good condition in your area.
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Professional Linux environmental blows microsoft windows out of the water. |
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