Chris,
can you clarify your reply please.
On 24/01/2002 11:35:20 Chris Jaecker wrote:
> To test for this try sending out pings with 1500 mtu and df set (client to server or
>vice versa).
#ping -?
Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
[-r count] [-s count] [[-j host-list] | [-k host-list]]
[-w timeout] destination-list
Options:
-t Ping the specifed host until interrupted.
-a Resolve addresses to hostnames.
-n count Number of echo requests to send.
-l size Send buffer size.
-f Set Don't Fragment flag in packet.
-i TTL Time To Live.
-v TOS Type Of Service.
-r count Record route for count hops.
-s count Timestamp for count hops.
-j host-list Loose source route along host-list.
-k host-list Strict source route along host-list.
-w timeout Timeout in milliseconds to wait for each reply.
...so that would be
ping -l 1500 -f remote_host
- correct ?
>If it is the problem, try this:
>
> The solution was to reduce the MTU of the VNC host. This can be done in the registry
>permanently with:
>
> HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\<adapter>\Tcpip\Parameters\MTU
>
> which should be set to 1400
[Under NT4 system] I couldn't find any Tcpip\Parameter names under Services and
couldn't really match <adapter> to my actual adapter
can you advise how to create an appropriate "<adapter>" name please.
> The NT server can also be forced to discover the MTU of a path by setting:
>
>
>HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUBHDetect
>
On my system, this did not exist, so presumably requires creation.
a) what is the behaviour when entry does not exist?
b) can you confirm that "discover" means "discover and use"
c) As a normal "end-user", when would you NOT want "discover and use" ?
I assume it is useful when investigating performance and setting up a network.
> which is a REG_DWORD value. Setting it to 1 forces the NT server to
> discover the MTU of the path to the target system (in this case the VNC
> viewer). If you set the value to 0, it forces the MTU down to 576, and
> doesn't attempt to discover the MTU at all.
thanks for your advice, Mark
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