[X2go-dev] High Performance SSH/SCP - HPN-SSH

Mike Gabriel m.gabriel at das-netzwerkteam.de
Mon Jun 28 20:46:34 CEST 2010

Hi John,

On Mo 28 Jun 2010 13:47:47 CEST "John A. Sullivan III" wrote:

>> This is the standard network performance tuning found everywhere. This is
>> interesting for a saturated server, but will not solve any fundamental
>> speed issues.
>> Br,
>> Erik

> I have been wondering if it will help with resilience.  We are having
> problems where, if the Internet connection starts dropping packets,
> recovery of the X2Go client is much slower than recovery of other
> applications such as web browsing.  We have tried playing with
> ClientAliveInterval and ClientAliveCountMax but that has not helped.
> Has anyone else been able to make X2Go session more robust across poor
> quality connections? Thanks - John

If TCP/IP packets get dropped on the way between source and target  
host you should primarily get to the bottom of that packet dropping.

Example: Some internet providers have started oversecuring their  
network routers (e.g. 1und1 in Germany). The ISPs block ICMP requests  
totally. This blockage then als includes ICMP Type 3 Code 4 packets  
(destination unreachable, don't fragment). If these kinds of packets  
are blocked by some routers on the way the Path MTU Discovery  
technique will fail which results in packet loss... (and endless  

PMTU discovery -> RFC 1191...

Being a bit off-topic on the list...



mike gabriel, dorfstr. 27, 24245 barmissen
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