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Technical News & Discussion => Broadband, Internet & General Computer News & Discussion => Topic started by: pctech on Nov 01, 2011, 12:48:16

Title: line fault performance metrics
Post by: pctech on Nov 01, 2011, 12:48:16
Trying to help someone with a nasty case of bad latency over the BT portion but his speed is ok.

His ISP has told him they can't raise a fault because the line is within specification (ADSL2+)

I know that packet loss in excess of 5% constitutes a fault but are there other metrics such as latency?

Title: Re: line fault performance metrics
Post by: Rik on Nov 01, 2011, 12:59:13
Not afaik, Mitch, as interleaving is used to stabilise a line as part of DLM.
Title: Re: line fault performance metrics
Post by: pctech on Nov 01, 2011, 13:06:37
Hmmm his latency is in the 300 ms area indicated between his router and the ISP's edge router which suggests exchange congestion.

Just looked at his post now and he says he's got a lot of DOS entries in his router log which suggests he's being repeatedly port scanned which of course would cause issues.

Title: Re: line fault performance metrics
Post by: .Griff. on Nov 01, 2011, 13:17:16
Quote from: pctech on Nov 01, 2011, 13:06:37
Hmmm his latency is in the 300 ms area indicated between his router and the ISP's edge router which suggests exchange congestion.

Just looked at his post now and he says he's got a lot of DOS entries in his router log which suggests he's being repeatedly port scanned which of course would cause issues.



Netgear router by any chance?
Title: Re: line fault performance metrics
Post by: pctech on Nov 01, 2011, 15:35:32
By the look of the logging format I'd say so.
Title: Re: line fault performance metrics
Post by: Gary on Nov 04, 2011, 07:58:21
Quote from: .Griff. on Nov 01, 2011, 13:17:16
Netgear router by any chance?
While you say 'Netgear router' not all do that, since we discussed pings not one Dos, as I said maybe a couple a years, so the newer performance ones ones have better logging I would say... :)
Title: Re: line fault performance metrics
Post by: Steve on Nov 04, 2011, 09:32:56
When a connection has very high latency the port that generated the request may well have closed before the response arrives. The router firewall will decide that this is a potential threat.