[LARTC] Weired problem with path MTU and trafic shaping

[LARTC] Weired problem with path MTU and trafic shaping

[Christian Berger]

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Servus,

I have a wiered problem with trafic shaping.
My situation is as follows:

I'm connected via ADSL to T-Online (large german ISP) and running a webserver 
on casandro.dyndns.org (that machine)

Whenever I activate trafic shaping with:
tc qdisc add dev ppp0 root tbf rate 120kbit latency 50ms burst 1440

only http-requests for small files come throught, larger ones simply hang. 
When I set the MTU to a small value (1024 or lower) it works for some 
clients.

What could it be?

Servus
  Casandro
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Re: [LARTC] Weired problem with path MTU and trafic shaping

[Patrick McHardy]

Christian Berger wrote:

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>Hash: SHA1
>
>Servus,
>
>I have a wiered problem with trafic shaping.
>My situation is as follows:
>
>I'm connected via ADSL to T-Online (large german ISP) and running a webserver 
>on casandro.dyndns.org (that machine)
>
>Whenever I activate trafic shaping with:
>tc qdisc add dev ppp0 root tbf rate 120kbit latency 50ms burst 1440
>

Burst is depth of the bucket, i.e. packets bigger that burst can never pass.
MTU for DSL links is usually 1492.

>only http-requests for small files come throught, larger ones simply hang. 
>When I set the MTU to a small value (1024 or lower) it works for some 
>clients.
>
>What could it be?
>
>Servus
>  Casandro
>
>  
>

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