Trying to avoid slow response time with ADSL when there is traffic


We have a 1200 downstream, 500 upstream ADSL connection with a Cisco 836 ADSL modem/router. I've noticed that as soon as there is a bit of serious traffic going through, the response time of applications like PING and SSH get quite bad. A ping takes for example 300 ms instead of

30 ms.

I tryed activating WFQ (Weight Fair Queuing) but didn't see any improvements. Does anyone know how I can deal with this problem and make response time better ?

Many thanks Regards

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Use strict priority queue. u can set the bandwidth for each protocol differently

access-list 110 permit tcp any any eq 22 access-list 120 permit icmp any any access-list 5 permit ip any any

class-map match-any ssh_or_ping match access-group 110 match access-group 120

class-map match-any rest match access-group 5

policy-map test class ssh_or_ping bandwidth xxx (say 20%) class rest police xxxx (set it not to exceed 80% of link)

int dialer 1 service-policy output test

I may have made mistakes in the above...refer to the document

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Forgot to mention, I have tried most queues and found little noticeable difference among them.I actually carried out timed tests. But you could apply the q i mentioned above and give me some feedback.

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Try to use the tx-ring-limit parameter under the pvc definition. It defaults to 16 packets, tune it to 4 or even lower.

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Joop van der Velden

I've now setted this parameter to 3, I saw it also mentioned in the Cisco docu for VoIP usage they recommend 3.

Also thanks to luqs for your detailed answer about the strict queue, if I see no significant improvement with this tx-ring-limit parameter I will try to add your strict queues to it.


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