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Date:      Fri, 10 Aug 2007 19:49:45 +0200
From:      Bram Schoenmakers <>
Cc:        Nikos Vassiliadis <>
Subject:   Re: Problem with dump over SSH: Operation timed out
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <>

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Op vrijdag 10 augustus 2007, schreef u:


> This really looks like a broken PMTU discovery.
> Is this still the case? After the firewall changes you did?
> Things may be different now. But, if a router in the path
> is filtering all ICMP traffic then the problem will remain.
> Try this on both hosts:
> sysctl net.inet.tcp.path_mtu_discovery=0
> sysctl net.inet.tcp.mssdflt=1000  (just to be safe,
> the default on 4.x is 1400, which can be big
> on 6.x is just 512)
> Please, just use scp to do your testing.
> When you rule out the possibility of a problematic
> network, you will add the (gzip|bzip2) & dump parts.
> Nikos

Thank you for those suggestions, it's appreciated. Although I get the same 
results with setting those values both on the server and on the client. SCP 
starts full speed, but at 20% of the 200 MB file it starts to stall. All ICMP 
traffic was open on both firewalls at that time.


Kind regards,

Bram Schoenmakers

What is mind? No matter. What is matter? Never mind.
(Punch, 1855)

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