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On Tuesday 13 November 2007, Mark Shields wrote: |
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> On Nov 12, 2007 6:59 PM, Grant <emailgrant@×××××.com> wrote: |
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> > I just switched from DSL to cable and I'm noticing a significant delay |
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> > when using Skype, even when nothing else is happening on my network. |
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> > Has anyone else noticed this and had success "fixing" it? I'm using a |
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> > Gentoo router so I can try just about anything. |
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> > |
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> > - Grant |
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> > -- |
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> > gentoo-user@g.o mailing list |
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> |
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> I work for as a cable modem technician. The first thing to check for when |
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> you're having cable internet problems is the modem. Call up tech support |
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> and ask them to check the signals on the modem (upstream power, downstream |
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> rcv, downstream SNR, upstream SNR, headend receive) and make sure they're |
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> in range. Also ask them to ping and (if available) rf ping to check for |
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> latency/packet loss. Also ask them to check the circuits/backbone. Also, |
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> can you reproduce this latency in the form of a ping/traceroute? This will |
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> go a long way with ISPs in determining where the problem is (although |
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> Comcast just blows off high latency on pings as the result of dropping them |
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> due to lower priority). |
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|
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Interesting to hear this. The OP will no doubt have a different traceroute to |
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show the ISP, but does the comment on dropping pings explain the % loss shown |
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below in certain hops, or is it just a matter of overloaded switches? |
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========================================================================== |
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HOST: lappy Loss% Snt Last Avg Best Wrst StDev |
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5. 217.41.177.66 0.0% 15 17.9 18.0 15.7 22.8 1.7 |
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6. 217.41.177.134 6.7% 15 21.0 17.5 15.7 21.0 1.5 |
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7. 217.41.177.54 0.0% 15 17.0 16.6 15.1 20.7 1.4 |
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8. 217.47.166.106 0.0% 15 16.0 16.9 15.3 18.9 1.1 |
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9. core1-pos5-2.faraday.ukcore. 0.0% 15 17.0 45.3 15.2 192.3 52.7 |
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10. core1-pos0-15-0-10.ilford.uk 0.0% 15 18.9 18.3 17.1 19.5 0.7 |
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11. 194.74.77.222 0.0% 15 18.1 17.1 15.5 19.1 1.0 |
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12. t2c1-ge14-0-0.uk-ilf.eu.bt.n 6.7% 15 17.9 17.3 15.7 19.1 0.9 |
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13. t2c1-p4-0-0.us-nyc.eu.bt.net 0.0% 15 107.3 108.1 106.1 109.7 1.1 |
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14. 12.116.102.17 0.0% 15 108.3 107.9 105.5 110.0 1.3 |
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15. tbr1.n54ny.ip.att.net 0.0% 15 133.2 133.8 131.2 135.4 1.4 |
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16. cr2.n54ny.ip.att.net 0.0% 15 135.2 133.5 131.6 135.7 1.3 |
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17. cr2.wswdc.ip.att.net 0.0% 15 132.2 132.9 131.3 134.7 1.1 |
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18. cr1.attga.ip.att.net 0.0% 15 134.2 133.6 132.1 135.7 1.2 |
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19. tbr2.attga.ip.att.net 0.0% 15 135.2 134.0 132.0 136.2 1.3 |
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20. gar4.attga.ip.att.net 0.0% 15 132.2 134.1 130.0 159.4 7.1 |
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21. 12.124.64.62 20.0% 15 140.2 138.6 137.0 140.4 1.1 |
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22. te-9-1-ur01.south.tn.knox.co 6.7% 15 141.2 140.4 138.1 141.5 1.0 |
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23. te-8-3-ur02.west.tn.knox.com 0.0% 15 141.2 140.3 139.1 141.2 0.6 |
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24. ge-1-46-ur01.west.tn.knox.co 0.0% 15 138.2 138.6 137.8 140.6 0.9 |
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========================================================================== |
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|
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Note some of these are being dropped in the UK, rather than by Comcast. |
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-- |
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Regards, |
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Mick |
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